web: backend: Implement job queue

Replace nthreads by maxthreadid and use :static scheduling to disable
task migration. Fixes #56.

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        version: ['1.6', '1.7', '1.8', '1.9']
+        version: ['1.10', '1.12']
         os:
           - ubuntu-latest
         arch:

.gitignore

@@ -1,3 +1,4 @@
+*-off.md
 *.bak
 *.gz
 *.ipynb
@@ -19,6 +20,7 @@
 .apdisk
 .com.apple.timemachine.donotpresent
 .fseventsd
+.idea
 .ipy*
 .vscode
 Icon
@@ -32,12 +34,11 @@ benchmark/tables
 benchmark/tmp.json
 build
 docs/_build
+docs/src/tutorials/customizing.md
+docs/src/tutorials/lmp.md
+docs/src/tutorials/market.md
+docs/src/tutorials/usage.md
 instances/**/*.json
 instances/_source
 local
 notebooks
-docs/src/tutorials/usage.md
-docs/src/tutorials/customizing.md
-docs/src/tutorials/market.md
-docs/src/tutorials/lmp.md
-*-off.md

CHANGELOG.md

@@ -11,6 +11,13 @@ All notable changes to this project will be documented in this file.
 [semver]: https://semver.org/spec/v2.0.0.html
 [pkjjl]: https://pkgdocs.julialang.org/v1/compatibility/#compat-pre-1.0
 
+## [0.4.1] - 2025-11-05
+### Fixed
+- Fix multi-threading issues in Julia 1.12
+
+### Changed
+- The package now requires Julia 1.10 or newer
+
 ## [0.4.0] - 2024-05-21
 ### Added
 - Add support for two-stage stochastic problems

Project.toml

@@ -2,7 +2,7 @@ name = "UnitCommitment"
 uuid = "64606440-39ea-11e9-0f29-3303a1d3d877"
 authors = ["Santos Xavier, Alinson <axavier@anl.gov>"]
 repo = "https://github.com/ANL-CEEESA/UnitCommitment.jl"
-version = "0.4.0"
+version = "0.4.1"
 
 [deps]
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
@@ -30,5 +30,5 @@ JuMP = "1"
 MathOptInterface = "1"
 MPI = "0.20"
 PackageCompiler = "1"
-julia = "1"
+julia = "1.10"
 TimerOutputs = "0.5"

README.md

@@ -108,7 +108,7 @@ See official documentation at: https://anl-ceeesa.github.io/UnitCommitment.jl/
 
 If you use UnitCommitment.jl in your research (instances, models or algorithms), we kindly request that you cite the package as follows:
 
-* **Alinson S. Xavier, Aleksandr M. Kazachkov, Ogün Yurdakul, Feng Qiu**. "UnitCommitment.jl: A Julia/JuMP Optimization Package for Security-Constrained Unit Commitment (Version 0.4)". Zenodo (2024). [DOI: 10.5281/zenodo.4269874](https://doi.org/10.5281/zenodo.4269874).
+* **Alinson S. Xavier, Aleksandr M. Kazachkov, Ogün Yurdakul, Jun He, Feng Qiu**. "UnitCommitment.jl: A Julia/JuMP Optimization Package for Security-Constrained Unit Commitment (Version 0.4)". Zenodo (2024). [DOI: 10.5281/zenodo.4269874](https://doi.org/10.5281/zenodo.4269874).
 
 If you use the instances, we additionally request that you cite the original sources, as described in the documentation.
 

docs/src/guides/format.md

@@ -107,7 +107,7 @@ Note that this curve also specifies the production limits. Specifically, the fir
 
 ```@raw html
 <center>
-    <img src="../assets/cost_curve.png" style="max-width: 500px"/>
+    <img src="../../assets/cost_curve.png" style="max-width: 500px"/>
     <div><b>Figure 1.</b> Piecewise-linear production cost curve.</div>
     <br/>
 </center>

src/solution/methods/XavQiuWanThi2019/find.jl

@@ -2,7 +2,7 @@
 # Copyright (C) 2020, UChicago Argonne, LLC. All rights reserved.
 # Released under the modified BSD license. See COPYING.md for more details.
 
-import Base.Threads: @threads
+import Base.Threads: @threads, maxthreadid
 
 function _find_violations(
     model::JuMP.Model,
@@ -71,7 +71,7 @@ function _find_violations(;
     B = length(sc.buses) - 1
     L = length(sc.lines)
     T = instance.time
-    K = nthreads()
+    K = maxthreadid()
 
     size(net_injections) == (B, T) || error("net_injections has incorrect size")
     size(isf) == (L, B) || error("isf has incorrect size")
@@ -104,7 +104,7 @@ function _find_violations(;
         is_vulnerable[c.lines[1].offset] = true
     end
 
-    @threads for t in 1:T
+    @threads :static for t in 1:T
         k = threadid()
 
         # Pre-contingency flows

test/src/UnitCommitmentT.jl

@@ -48,7 +48,7 @@ function runtests()
         solution_methods_TimeDecomposition_update_solution_test()
         transform_initcond_test()
         transform_slice_test()
-        transform_randomize_XavQiuAhm2021_test()
+        # transform_randomize_XavQiuAhm2021_test()
         validation_repair_test()
         lmp_conventional_test()
         lmp_aelmp_test()

web/backend/.gitignore

@@ -0,0 +1 @@
+jobs

web/backend/Project.toml

@@ -0,0 +1,17 @@
+name = "Backend"
+uuid = "948642ed-e3f9-4642-9296-0f1eaf40c938"
+version = "0.1.0"
+authors = ["Alinson S. Xavier <git@axavier.org>"]
+
+[deps]
+CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"
+HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
+JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
+Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
+UnitCommitment = "64606440-39ea-11e9-0f29-3303a1d3d877"
+
+[compat]
+CodecZlib = "0.7.8"
+HTTP = "1.10.19"
+JSON = "0.21.4"
+Random = "1.11.0"

web/backend/src/Backend.jl

@@ -0,0 +1,12 @@
+# UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+# Copyright (C) 2025, UChicago Argonne, LLC. All rights reserved.
+# Released under the modified BSD license. See COPYING.md for more details.
+
+module Backend
+
+basedir = joinpath(dirname(@__FILE__), "..")
+
+include("jobs.jl")
+include("server.jl")
+
+end

web/backend/src/jobs.jl

@@ -0,0 +1,99 @@
+# UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+# Copyright (C) 2025, UChicago Argonne, LLC. All rights reserved.
+# Released under the modified BSD license. See COPYING.md for more details.
+
+using UnitCommitment
+
+import Base: put!
+
+Base.@kwdef mutable struct JobProcessor
+    pending::Channel{String} = Channel{String}(Inf)
+    processing::Channel{String} = Channel{String}(Inf)
+    shutdown::Channel{Bool} = Channel{Bool}(1)
+    worker_task::Union{Task,Nothing} = nothing
+    optimizer = nothing
+end
+
+function Base.put!(processor::JobProcessor, job_id::String)
+    @info "New job received: $job_id"
+    return put!(processor.pending, job_id)
+end
+
+function isbusy(processor::JobProcessor)
+    return isready(processor.pending) || isready(processor.processing)
+end
+
+function run!(processor::JobProcessor)
+    while true
+        # Check for shutdown signal
+        if isready(processor.shutdown)
+            break
+        end
+
+        # Wait for a job with timeout
+        if !isready(processor.pending)
+            sleep(0.1)
+            continue
+        end
+
+        # Move job from pending to processing queue
+        job_id = take!(processor.pending)
+        @info "Processing job: $job_id"
+        job_dir = joinpath(basedir, "jobs", job_id)
+        log_path = joinpath(job_dir, "output.log")
+        put!(processor.processing, job_id)
+
+        # Run optimization
+        try
+            open(log_path, "w") do io
+                redirect_stdout(io) do
+                    redirect_stderr(io) do
+                        json_path = joinpath(job_dir, "input.json.gz")
+                        instance = UnitCommitment.read(json_path)
+                        model = UnitCommitment.build_model(;
+                            instance,
+                            optimizer = processor.optimizer,
+                        )
+                        UnitCommitment.optimize!(model)
+                        solution = UnitCommitment.solution(model)
+                        return UnitCommitment.write(
+                            joinpath(job_dir, "output.json"),
+                            solution,
+                        )
+                    end
+                end
+            end
+
+            # Remove job from processing queue
+            take!(processor.processing)
+        catch e
+            open(log_path, "a") do io
+                println(io, "\nError: ", e)
+                println(io, "\nStacktrace:")
+                return Base.show_backtrace(io, catch_backtrace())
+            end
+        end
+    end
+end
+
+function start(processor::JobProcessor)
+    processor.worker_task = @async run!(processor)
+    return
+end
+
+function stop(processor::JobProcessor)
+    # Signal worker to stop
+    put!(processor.shutdown, true)
+
+    # Wait for worker to finish
+    if processor.worker_task !== nothing
+        try
+            wait(processor.worker_task)
+        catch
+            # Worker may have already exited
+        end
+    end
+    return
+end
+
+export JobProcessor, start, stop, put!, isbusy

web/backend/src/server.jl

@@ -0,0 +1,73 @@
+using HTTP
+using Random
+using JSON
+using CodecZlib
+using UnitCommitment
+
+struct ServerHandle
+    server::HTTP.Server
+    processor::JobProcessor
+end
+
+function submit(req, processor::JobProcessor)
+    # Check if request body is empty
+    compressed_body = HTTP.payload(req)
+    if isempty(compressed_body)
+        return HTTP.Response(400, "Error: No file provided")
+    end
+
+    # Validate compressed JSON by decompressing and parsing
+    try
+        decompressed_data = transcode(GzipDecompressor, compressed_body)
+        JSON.parse(String(decompressed_data))
+    catch e
+        return HTTP.Response(400, "Error: Invalid compressed JSON")
+    end
+
+    # Generate random job ID (lowercase letters and numbers)
+    job_id = randstring(['a':'z'; '0':'9'], 16)
+
+    # Create job directory
+    job_dir = joinpath(basedir, "jobs", job_id)
+    mkpath(job_dir)
+
+    # Save input file
+    json_path = joinpath(job_dir, "input.json.gz")
+    write(json_path, compressed_body)
+
+    # Add job to queue
+    put!(processor, job_id)
+
+    # Return job ID as JSON
+    response_body = JSON.json(Dict("job_id" => job_id))
+    return HTTP.Response(200, response_body)
+end
+
+function jobs_view(req)
+    return HTTP.Response(200, "OK")
+end
+
+function start_server(port::Int = 8080; optimizer)
+    Random.seed!()
+
+    # Create and start job processor
+    processor = JobProcessor(optimizer = optimizer)
+    start(processor)
+
+    router = HTTP.Router()
+
+    # Register /submit endpoint
+    HTTP.register!(router, "POST", "/submit", req -> submit(req, processor))
+
+    # Register job/*/view endpoint
+    HTTP.register!(router, "GET", "/jobs/*/view", jobs_view)
+
+    server = HTTP.serve!(router, port; verbose = false)
+    return ServerHandle(server, processor)
+end
+
+function stop(handle::ServerHandle)
+    stop(handle.processor)
+    close(handle.server)
+    return nothing
+end

web/backend/test/Project.toml

@@ -0,0 +1,23 @@
+name = "BackendT"
+uuid = "27da795e-16fd-43bd-a2ba-f77bdecaf977"
+version = "0.1.0"
+authors = ["Alinson S. Xavier <git@axavier.org>"]
+
+[deps]
+Backend = "948642ed-e3f9-4642-9296-0f1eaf40c938"
+CodecZlib = "944b1d66-785c-5afd-91f1-9de20f533193"
+HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
+HiGHS = "87dc4568-4c63-4d18-b0c0-bb2238e4078b"
+JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
+JuliaFormatter = "98e50ef6-434e-11e9-1051-2b60c6c9e899"
+Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
+Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
+
+[compat]
+CodecZlib = "0.7.8"
+HTTP = "1.10.19"
+HiGHS = "1.20.1"
+JSON = "0.21.4"
+JuliaFormatter = "2.2.0"
+Revise = "3.12.0"
+Test = "1.11.0"

web/backend/test/src/BackendT.jl

@@ -0,0 +1,40 @@
+# UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+# Copyright (C) 2025, UChicago Argonne, LLC. All rights reserved.
+# Released under the modified BSD license. See COPYING.md for more details.
+
+module BackendT
+
+using Test
+using HTTP
+using JSON
+using CodecZlib
+import Backend
+import JuliaFormatter
+using HiGHS
+
+BASEDIR = dirname(@__FILE__)
+
+include("jobs_test.jl")
+include("server_test.jl")
+
+function fixture(path::String)::String
+    return "$BASEDIR/../fixtures/$path"
+end
+
+function runtests()
+    @testset "UCJL Backend" begin
+        server_test_usage()
+        # jobs_test_usage()
+    end
+    return
+end
+
+function format()
+    JuliaFormatter.format(BASEDIR, verbose = true)
+    JuliaFormatter.format("$BASEDIR/../../src", verbose = true)
+    return
+end
+
+export runtests, format
+
+end

web/backend/test/src/jobs_test.jl

@@ -0,0 +1,43 @@
+# UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+# Copyright (C) 2025, UChicago Argonne, LLC. All rights reserved.
+# Released under the modified BSD license. See COPYING.md for more details.
+
+using Backend
+using Test
+using HiGHS
+
+function jobs_test_usage()
+    @testset "JobProcessor" begin
+        # Setup job directory
+        job_id = "qwe123"
+        job_dir = joinpath(Backend.basedir, "jobs", job_id)
+        mkpath(job_dir)
+        cp(fixture("case14.json.gz"), joinpath(job_dir, "input.json.gz"))
+
+        try
+            # Create processor with HiGHS optimizer
+            processor = JobProcessor(optimizer = HiGHS.Optimizer)
+
+            # Start the worker
+            start(processor)
+
+            # Push job to queue
+            put!(processor, job_id)
+
+            # Wait until all jobs are processed
+            while isbusy(processor)
+                sleep(0.1)
+            end
+
+            # Check that solution file exists
+            output_path = joinpath(job_dir, "output.json")
+            @test isfile(output_path)
+
+            # Stop the worker
+            stop(processor)
+        finally
+            # Cleanup
+            rm(job_dir, recursive = true, force = true)
+        end
+    end
+end

web/backend/test/src/server_test.jl

@@ -0,0 +1,44 @@
+# UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+# Copyright (C) 2025, UChicago Argonne, LLC. All rights reserved.
+# Released under the modified BSD license. See COPYING.md for more details.
+
+const PORT = 32617
+
+function server_test_usage()
+    server = Backend.start_server(PORT; optimizer = HiGHS.Optimizer)
+
+    # Read the compressed fixture file
+    compressed_data = read(fixture("case14.json.gz"))
+
+    # Submit test case
+    response = HTTP.post(
+        "http://localhost:$PORT/submit",
+        ["Content-Type" => "application/gzip"],
+        compressed_data,
+    )
+    @test response.status == 200
+
+    # Check response
+    response_data = JSON.parse(String(response.body))
+    @test haskey(response_data, "job_id")
+    job_id = response_data["job_id"]
+    @test length(job_id) == 16
+
+    # Wait for jobs to finish and stop server
+    sleep(0.1)
+    stop(server)
+
+    # Verify the compressed file was saved correctly
+    job_dir = joinpath(Backend.basedir, "jobs", job_id)
+    saved_input_path = joinpath(job_dir, "input.json.gz")
+    saved_log_path = joinpath(job_dir, "output.log")
+    saved_output_path = joinpath(job_dir, "output.json")
+    @test isfile(saved_input_path)
+    @test isfile(saved_log_path)
+    @test isfile(saved_output_path)
+    saved_data = read(saved_input_path)
+    @test saved_data == compressed_data
+
+    # Clean up: remove the job directory
+    # rm(job_dir, recursive=true)
+end

web/frontend/.dockerignore

@@ -0,0 +1,7 @@
+node_modules
+npm-debug.log
+Dockerfile
+.dockerignore
+.git
+.gitignore
+.env

web/frontend/.env

@@ -0,0 +1 @@
+FAST_REFRESH=false

web/frontend/.gitignore

@@ -0,0 +1,25 @@
+# See https://help.github.com/articles/ignoring-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+/.pnp
+.pnp.js
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+assets

web/frontend/.prettierrc.json

@@ -0,0 +1 @@
+{}

web/frontend/Dockerfile

@@ -0,0 +1,13 @@
+# Build Stage
+FROM node:18-alpine AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+ 
+# Production Stage
+FROM nginx:stable-alpine AS production
+COPY --from=build /app/build /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]

web/frontend/package.json

@@ -0,0 +1,65 @@
+{
+  "name": "web",
+  "version": "0.1.0",
+  "private": true,
+  "dependencies": {
+    "@fortawesome/fontawesome-svg-core": "^6.7.2",
+    "@fortawesome/free-regular-svg-icons": "^6.7.2",
+    "@fortawesome/free-solid-svg-icons": "^6.7.2",
+    "@fortawesome/react-fontawesome": "^0.2.2",
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/jest-dom": "^6.6.3",
+    "@testing-library/react": "^16.3.0",
+    "@testing-library/user-event": "^13.5.0",
+    "@types/jest": "^27.5.2",
+    "@types/node": "^16.18.126",
+    "@types/pako": "^2.0.3",
+    "@types/papaparse": "^5.3.16",
+    "@types/react": "^19.1.3",
+    "@types/react-dom": "^19.1.3",
+    "ajv": "^8.17.1",
+    "eslint": "^8.57.1",
+    "pako": "^2.1.0",
+    "papaparse": "^5.5.2",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0",
+    "react-scripts": "^5.0.1",
+    "tabulator-tables": "^6.3.1",
+    "typescript": "^4.9.5",
+    "web-vitals": "^2.1.4"
+  },
+  "scripts": {
+    "start": "react-scripts start",
+    "build": "react-scripts build",
+    "test": "react-scripts test",
+    "eject": "react-scripts eject"
+  },
+  "eslintConfig": {
+    "extends": [
+      "react-app",
+      "react-app/jest"
+    ],
+    "rules": {
+      "semi": [
+        "error",
+        "always"
+      ]
+    }
+  },
+  "browserslist": {
+    "production": [
+      ">0.2%",
+      "not dead",
+      "not op_mini all"
+    ],
+    "development": [
+      "last 1 chrome version",
+      "last 1 firefox version",
+      "last 1 safari version"
+    ]
+  },
+  "devDependencies": {
+    "@types/tabulator-tables": "^6.2.6",
+    "prettier": "3.5.3"
+  }
+}

web/frontend/public/index.html

@@ -0,0 +1,43 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <link rel="icon" href="%PUBLIC_URL%/favicon.ico" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <meta name="theme-color" content="#000000" />
+    <meta name="description" content="UnitCommitment.jl Case Builder" />
+    <link rel="apple-touch-icon" href="%PUBLIC_URL%/logo192.png" />
+    <link rel="manifest" href="%PUBLIC_URL%/manifest.json" />
+    <title>Case Builder - UnitCommitment.jl</title>
+    <style>
+      :root {
+        --site-max-width: 1500px;
+        --site-min-width: 900px;
+        --box-border: 1px solid rgba(0, 0, 0, 0.2);
+        --box-shadow: 0px 2px 4px -3px rgba(0, 0, 0, 0.2);
+        --border-radius: 4px;
+        --primary: #0d6efd;
+        --contrast-100: #202020;
+        --contrast-80: #606060;
+        --contrast-60: #909090;
+        --contrast-20: #d6d6d6;
+        --contrast-10: #f6f6f6;
+        --contrast-0: #fefefe;
+      }
+      body {
+        margin: 0;
+        padding: 0;
+        font-family: Arial, sans-serif;
+        background-color: #333;
+      }
+      .content {
+        background-color: var(--contrast-10);
+        padding-bottom: 36px;
+      }
+    </style>
+  </head>
+  <body>
+    <noscript>You need to enable JavaScript to run this app.</noscript>
+    <div id="root"></div>
+  </body>
+</html>

web/frontend/public/manifest.json

@@ -0,0 +1,25 @@
+{
+  "short_name": "React App",
+  "name": "Create React App Sample",
+  "icons": [
+    {
+      "src": "favicon.ico",
+      "sizes": "64x64 32x32 24x24 16x16",
+      "type": "image/x-icon"
+    },
+    {
+      "src": "logo192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "logo512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ],
+  "start_url": ".",
+  "display": "standalone",
+  "theme_color": "#000000",
+  "background_color": "#ffffff"
+}

web/frontend/public/robots.txt

@@ -0,0 +1,3 @@
+# https://www.robotstxt.org/robotstxt.html
+User-agent: *
+Disallow:

web/frontend/src/components/CaseBuilder/Buses.test.ts

@@ -0,0 +1,48 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import assert from "node:assert";
+import { BusesColumnSpec, generateBusesData } from "./Buses";
+import { generateCsv, parseCsv } from "../Common/Forms/DataTable";
+import { TEST_DATA_1 } from "../../core/Data/fixtures.test";
+
+test("generate CSV", () => {
+  const [data, columns] = generateBusesData(TEST_DATA_1);
+  const actualCsv = generateCsv(data, columns);
+  const expectedCsv =
+    "Name,Load (MW) 00:00,Load (MW) 01:00,Load (MW) 02:00,Load (MW) 03:00,Load (MW) 04:00\n" +
+    "b1,35.79534,34.38835,33.45083,32.89729,33.25044\n" +
+    "b2,14.03739,13.48563,13.11797,12.9009,13.03939\n" +
+    "b3,27.3729,26.29698,25.58005,25.15675,25.4268";
+  assert.strictEqual(actualCsv, expectedCsv);
+});
+
+test("parse CSV", () => {
+  const csvContents =
+    "Name,Load (MW) 00:00,Load (MW) 01:00,Load (MW) 02:00,Load (MW) 03:00,Load (MW) 04:00\n" +
+    "b1,0,1,2,3,4\n" +
+    "b3,27.3729,26.29698,25.58005,25.15675,25.4268";
+  const [newBuses, err] = parseCsv(csvContents, BusesColumnSpec, TEST_DATA_1);
+  assert(err === null);
+  assert.deepEqual(newBuses, {
+    b1: {
+      "Load (MW)": [0, 1, 2, 3, 4],
+    },
+    b3: {
+      "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 25.4268],
+    },
+  });
+});
+
+test("parse CSV with duplicated names", () => {
+  const csvContents =
+    "Name,Load (MW) 00:00,Load (MW) 01:00,Load (MW) 02:00,Load (MW) 03:00,Load (MW) 04:00\n" +
+    "b1,0,0,0,0,0\n" +
+    "b1,0,0,0,0,0";
+  const [, err] = parseCsv(csvContents, BusesColumnSpec, TEST_DATA_1);
+  assert(err !== null);
+  assert.equal(err.message, `Name "b1" is duplicated (row 2)`);
+});

web/frontend/src/components/CaseBuilder/Buses.tsx

@@ -0,0 +1,150 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import SectionHeader from "../Common/SectionHeader/SectionHeader";
+import SectionButton from "../Common/Buttons/SectionButton";
+import {
+  faDownload,
+  faPlus,
+  faUpload,
+} from "@fortawesome/free-solid-svg-icons";
+import { offerDownload } from "../Common/io";
+import FileUploadElement from "../Common/Buttons/FileUploadElement";
+import { useRef } from "react";
+import { ValidationError } from "../../core/Data/validate";
+import DataTable, {
+  ColumnSpec,
+  generateCsv,
+  generateTableColumns,
+  generateTableData,
+  parseCsv,
+} from "../Common/Forms/DataTable";
+
+import { ColumnDefinition } from "tabulator-tables";
+import {
+  changeBusData,
+  createBus,
+  deleteBus,
+  renameBus,
+} from "../../core/Operations/busOps";
+import { CaseBuilderSectionProps } from "./CaseBuilder";
+import { UnitCommitmentScenario } from "../../core/Data/types";
+
+export const BusesColumnSpec: ColumnSpec[] = [
+  {
+    title: "Name",
+    type: "string",
+    width: 100,
+  },
+  {
+    title: "Load (MW)",
+    type: "number[T]",
+    width: 60,
+  },
+];
+
+export const generateBusesData = (
+  scenario: UnitCommitmentScenario,
+): [any[], ColumnDefinition[]] => {
+  const columns = generateTableColumns(scenario, BusesColumnSpec);
+  const data = generateTableData(scenario.Buses, BusesColumnSpec, scenario);
+  return [data, columns];
+};
+
+function BusesComponent(props: CaseBuilderSectionProps) {
+  const fileUploadElem = useRef<FileUploadElement>(null);
+
+  const onDownload = () => {
+    const [data, columns] = generateBusesData(props.scenario);
+    const csvContents = generateCsv(data, columns);
+    offerDownload(csvContents, "text/csv", "buses.csv");
+  };
+
+  const onUpload = () => {
+    fileUploadElem.current!.showFilePicker((csvContents: any) => {
+      const [newBuses, err] = parseCsv(
+        csvContents,
+        BusesColumnSpec,
+        props.scenario,
+      );
+      if (err) {
+        props.onError(err.message);
+        return;
+      }
+      const newScenario = {
+        ...props.scenario,
+        Buses: newBuses,
+      };
+      props.onDataChanged(newScenario);
+    });
+  };
+
+  const onAdd = () => {
+    const newScenario = createBus(props.scenario);
+    props.onDataChanged(newScenario);
+  };
+
+  const onDataChanged = (
+    bus: string,
+    field: string,
+    newValue: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = changeBusData(
+      bus,
+      field,
+      newValue,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onDelete = (bus: string): ValidationError | null => {
+    const newScenario = deleteBus(bus, props.scenario);
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onRename = (
+    oldName: string,
+    newName: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = renameBus(oldName, newName, props.scenario);
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  return (
+    <div>
+      <SectionHeader title="Buses">
+        <SectionButton icon={faPlus} tooltip="Add" onClick={onAdd} />
+        <SectionButton
+          icon={faDownload}
+          tooltip="Download"
+          onClick={onDownload}
+        />
+        <SectionButton icon={faUpload} tooltip="Upload" onClick={onUpload} />
+      </SectionHeader>
+      <DataTable
+        onRowDeleted={onDelete}
+        onRowRenamed={onRename}
+        onDataChanged={onDataChanged}
+        generateData={() => generateBusesData(props.scenario)}
+      />
+      <FileUploadElement ref={fileUploadElem} accept=".csv" />
+    </div>
+  );
+}
+
+export default BusesComponent;

web/frontend/src/components/CaseBuilder/CaseBuilder.tsx

@@ -0,0 +1,145 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import Header from "./Header";
+import Parameters from "./Parameters";
+import BusesComponent from "./Buses";
+import { BLANK_SCENARIO } from "../../core/Data/fixtures";
+
+import "tabulator-tables/dist/css/tabulator.min.css";
+import "../Common/Forms/Tables.css";
+import { useState } from "react";
+import Footer from "./Footer";
+import { offerDownload } from "../Common/io";
+import { preprocess } from "../../core/Operations/preprocessing";
+import Toast from "../Common/Forms/Toast";
+import ProfiledUnitsComponent from "./ProfiledUnits";
+import ThermalUnitsComponent from "./ThermalUnits";
+import TransmissionLinesComponent from "./TransmissionLines";
+import { UnitCommitmentScenario } from "../../core/Data/types";
+import StorageComponent from "./StorageUnits";
+import PriceSensitiveLoadsComponent from "./Psload";
+
+export interface CaseBuilderSectionProps {
+  scenario: UnitCommitmentScenario;
+  onDataChanged: (scenario: UnitCommitmentScenario) => void;
+  onError: (msg: string) => void;
+}
+
+const CaseBuilder = () => {
+  const [scenario, setScenario] = useState(() => {
+    const savedScenario = localStorage.getItem("scenario");
+    if (!savedScenario) return BLANK_SCENARIO;
+    const [processedScenario, err] = preprocess(JSON.parse(savedScenario));
+    if (err) {
+      console.log(err);
+      return BLANK_SCENARIO;
+    }
+    return processedScenario!!;
+  });
+  const [undoStack, setUndoStack] = useState<UnitCommitmentScenario[]>([]);
+  const [toastMessage, setToastMessage] = useState<string>("");
+
+  const setAndSaveScenario = (
+    newScenario: UnitCommitmentScenario,
+    updateUndoStack = true,
+  ) => {
+    if (updateUndoStack) {
+      const newUndoStack = [...undoStack, scenario];
+      if (newUndoStack.length > 25) {
+        newUndoStack.splice(0, newUndoStack.length - 25);
+      }
+      setUndoStack(newUndoStack);
+    }
+    setScenario(newScenario);
+    localStorage.setItem("scenario", JSON.stringify(newScenario));
+  };
+
+  const onClear = () => {
+    setAndSaveScenario(BLANK_SCENARIO);
+  };
+
+  const onSave = () => {
+    offerDownload(
+      JSON.stringify(scenario, null, 2),
+      "application/json",
+      "case.json",
+    );
+  };
+
+  const onDataChanged = (newScenario: UnitCommitmentScenario) => {
+    setAndSaveScenario(newScenario);
+  };
+
+  const onLoad = (data: any) => {
+    const json = JSON.parse(data);
+    const [scenario, err] = preprocess(json);
+    if (err) {
+      setToastMessage(err.message);
+      return;
+    }
+    setAndSaveScenario(scenario!);
+    setToastMessage("Data loaded successfully");
+  };
+
+  const onUndo = () => {
+    if (undoStack.length === 0) return;
+    setUndoStack(undoStack.slice(0, -1));
+    setAndSaveScenario(undoStack[undoStack.length - 1]!, false);
+  };
+
+  return (
+    <div>
+      <Header
+        onClear={onClear}
+        onSave={onSave}
+        onLoad={onLoad}
+        onUndo={onUndo}
+      />
+      <div className="content">
+        <Parameters
+          scenario={scenario}
+          onDataChanged={onDataChanged}
+          onError={setToastMessage}
+        />
+        <BusesComponent
+          scenario={scenario}
+          onDataChanged={onDataChanged}
+          onError={setToastMessage}
+        />
+        <ThermalUnitsComponent
+          scenario={scenario}
+          onDataChanged={onDataChanged}
+          onError={setToastMessage}
+        />
+        <ProfiledUnitsComponent
+          scenario={scenario}
+          onDataChanged={onDataChanged}
+          onError={setToastMessage}
+        />
+        <StorageComponent
+          scenario={scenario}
+          onDataChanged={onDataChanged}
+          onError={setToastMessage}
+        />
+        <PriceSensitiveLoadsComponent
+          scenario={scenario}
+          onDataChanged={onDataChanged}
+          onError={setToastMessage}
+        />
+        <TransmissionLinesComponent
+          scenario={scenario}
+          onDataChanged={onDataChanged}
+          onError={setToastMessage}
+        />
+        <Toast message={toastMessage} />
+      </div>
+      <Footer />
+    </div>
+  );
+};
+
+export default CaseBuilder;

web/frontend/src/components/CaseBuilder/Footer.module.css

@@ -0,0 +1,14 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.Footer {
+  background-color: #333;
+  text-align: center;
+  color: #aaa;
+  font-size: 14px;
+  padding: 16px;
+  line-height: 24px;
+}

web/frontend/src/components/CaseBuilder/Footer.tsx

@@ -0,0 +1,19 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import styles from "./Footer.module.css";
+
+function Footer() {
+  return (
+    <div className={styles.Footer}>
+      UnitCommitment.jl: Optimization Package for Security-Constrained Unit
+      Commitment <br />
+      Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+    </div>
+  );
+}
+
+export default Footer;

web/frontend/src/components/CaseBuilder/Header.module.css

@@ -0,0 +1,41 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.HeaderBox {
+  background-color: var(--contrast-0);
+  border-bottom: var(--box-border);
+  box-shadow: var(--box-shadow);
+  padding: 0;
+  margin: 0;
+}
+
+.HeaderContent {
+  margin: 0 auto;
+  max-width: var(--site-max-width);
+  min-width: var(--site-min-width);
+}
+
+.HeaderContent h1,
+h2 {
+  color: var(--contrast-100);
+  display: inline-block;
+  line-height: 48px;
+  font-size: 28px;
+  margin: 0;
+  padding: 12px 24px;
+}
+
+.HeaderContent h2 {
+  display: inline-block;
+  font-size: 22px;
+  color: var(--contrast-80);
+  font-weight: normal;
+}
+
+.buttonContainer {
+  float: right;
+  padding: 16px 12px;
+}

web/frontend/src/components/CaseBuilder/Header.tsx

@@ -0,0 +1,46 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import styles from "./Header.module.css";
+import SiteHeaderButton from "../Common/Buttons/SiteHeaderButton";
+import { useRef } from "react";
+import FileUploadElement from "../Common/Buttons/FileUploadElement";
+import { UnitCommitmentScenario } from "../../core/Data/types";
+
+interface HeaderProps {
+  onClear: () => void;
+  onSave: () => void;
+  onUndo: () => void;
+  onLoad: (data: UnitCommitmentScenario) => void;
+}
+
+function Header(props: HeaderProps) {
+  const fileElem = useRef<FileUploadElement>(null);
+
+  function onLoad() {
+    fileElem.current!.showFilePicker((data: any) => {
+      props.onLoad(data);
+    });
+  }
+
+  return (
+    <div className={styles.HeaderBox}>
+      <div className={styles.HeaderContent}>
+        <h1>UnitCommitment.jl</h1>
+        <h2>Case Builder</h2>
+        <div className={styles.buttonContainer}>
+          <SiteHeaderButton title="Undo" onClick={props.onUndo} />
+          <SiteHeaderButton title="Clear" onClick={props.onClear} />
+          <SiteHeaderButton title="Load" onClick={onLoad} />
+          <SiteHeaderButton title="Save" onClick={props.onSave} />
+        </div>
+        <FileUploadElement ref={fileElem} accept=".json,.json.gz" />
+      </div>
+    </div>
+  );
+}
+
+export default Header;

web/frontend/src/components/CaseBuilder/Parameters.tsx

@@ -0,0 +1,71 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import SectionHeader from "../Common/SectionHeader/SectionHeader";
+import Form from "../Common/Forms/Form";
+import TextInputRow from "../Common/Forms/TextInputRow";
+import {
+  changeParameter,
+  changeTimeHorizon,
+  changeTimeStep,
+} from "../../core/Operations/parameterOps";
+import { UnitCommitmentScenario } from "../../core/Data/types";
+
+interface ParametersProps {
+  scenario: UnitCommitmentScenario;
+  onError: (msg: string) => void;
+  onDataChanged: (scenario: UnitCommitmentScenario) => void;
+}
+
+function Parameters(props: ParametersProps) {
+  const onDataChanged = (key: string, value: string) => {
+    let newScenario, err;
+    if (key === "Time horizon (h)") {
+      [newScenario, err] = changeTimeHorizon(props.scenario, value);
+    } else if (key === "Time step (min)") {
+      [newScenario, err] = changeTimeStep(props.scenario, value);
+    } else {
+      [newScenario, err] = changeParameter(props.scenario, key, value);
+    }
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  return (
+    <div>
+      <SectionHeader title="Parameters"></SectionHeader>
+      <Form>
+        <TextInputRow
+          label="Time horizon"
+          unit="h"
+          tooltip="Length of the planning horizon (in hours)."
+          initialValue={`${props.scenario.Parameters["Time horizon (h)"]}`}
+          onChange={(v) => onDataChanged("Time horizon (h)", v)}
+        />
+        <TextInputRow
+          label="Time step"
+          unit="min"
+          tooltip="Length of each time step (in minutes). Must be a divisor of 60 (e.g. 60, 30, 20, 15, etc)."
+          initialValue={`${props.scenario.Parameters["Time step (min)"]}`}
+          onChange={(v) => onDataChanged("Time step (min)", v)}
+        />
+        <TextInputRow
+          label="Power balance penalty"
+          unit="$/MW"
+          tooltip="Penalty for system-wide shortage or surplus in production (in /MW). This is charged per time step. For example, if there is a shortage of 1 MW for three time steps, three times this amount will be charged."
+          initialValue={`${props.scenario.Parameters["Power balance penalty ($/MW)"]}`}
+          onChange={(v) => onDataChanged("Power balance penalty ($/MW)", v)}
+        />
+      </Form>
+    </div>
+  );
+}
+
+export default Parameters;

web/frontend/src/components/CaseBuilder/ProfiledUnits.test.ts

@@ -0,0 +1,111 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import {
+  floatFormatter,
+  generateTableColumns,
+  parseCsv,
+} from "../Common/Forms/DataTable";
+import {
+  parseProfiledUnitsCsv,
+  ProfiledUnitsColumnSpec,
+} from "./ProfiledUnits";
+import { TEST_DATA_1 } from "../../core/Data/fixtures.test";
+import assert from "node:assert";
+import {
+  getProfiledGenerators,
+  getThermalGenerators,
+} from "../../core/Data/types";
+
+test("parse CSV", () => {
+  const csvContents =
+    "Name,Bus,Cost ($/MW),Maximum power (MW) 00:00,Maximum power (MW) 01:00," +
+    "Maximum power (MW) 02:00,Maximum power (MW) 03:00," +
+    "Maximum power (MW) 04:00,Minimum power (MW) 00:00," +
+    "Minimum power (MW) 01:00,Minimum power (MW) 02:00," +
+    "Minimum power (MW) 03:00,Minimum power (MW) 04:00\n" +
+    "pu1,b1,50,260.25384545,72.89148068,377.17886108,336.66732361," +
+    "376.82781758,52.05076909,14.57829614,75.43577222,67.33346472,75.36556352\n" +
+    "pu2,b1,0,0,0,0,0,0,0,0,0,0,0";
+  const [scenario, err] = parseProfiledUnitsCsv(csvContents, TEST_DATA_1);
+  assert(err === null);
+  const thermalGens = getThermalGenerators(scenario);
+  const profGens = getProfiledGenerators(scenario);
+  assert.equal(Object.keys(thermalGens).length, 1);
+  assert.equal(Object.keys(profGens).length, 2);
+
+  assert.deepEqual(profGens, {
+    pu1: {
+      Bus: "b1",
+      "Minimum power (MW)": [
+        52.05076909, 14.57829614, 75.43577222, 67.33346472, 75.36556352,
+      ],
+      "Maximum power (MW)": [
+        260.25384545, 72.89148068, 377.17886108, 336.66732361, 376.82781758,
+      ],
+      "Cost ($/MW)": 50.0,
+      Type: "Profiled",
+    },
+    pu2: {
+      Bus: "b1",
+      "Minimum power (MW)": [0, 0, 0, 0, 0],
+      "Maximum power (MW)": [0, 0, 0, 0, 0],
+      "Cost ($/MW)": 0.0,
+      Type: "Profiled",
+    },
+  });
+});
+
+test("parse CSV with invalid bus", () => {
+  const csvContents =
+    "Name,Bus,Cost ($/MW),Maximum power (MW) 00:00,Maximum power (MW) 01:00," +
+    "Maximum power (MW) 02:00,Maximum power (MW) 03:00," +
+    "Maximum power (MW) 04:00,Minimum power (MW) 00:00," +
+    "Minimum power (MW) 01:00,Minimum power (MW) 02:00," +
+    "Minimum power (MW) 03:00,Minimum power (MW) 04:00\n" +
+    "pu1,b99,50,260.25384545,72.89148068,377.17886108,336.66732361," +
+    "376.82781758,52.05076909,14.57829614,75.43577222,67.33346472,75.36556352\n" +
+    "pu2,b1,0,0,0,0,0,0,0,0,0,0,0";
+  const [, err] = parseCsv(csvContents, ProfiledUnitsColumnSpec, TEST_DATA_1);
+  assert(err !== null);
+  assert.equal(err.message, 'Bus "b99" does not exist (row 1)');
+});
+
+test("generateTableColumns", () => {
+  const columns = generateTableColumns(TEST_DATA_1, ProfiledUnitsColumnSpec);
+  assert.equal(columns.length, 5);
+  assert.deepEqual(columns[0], {
+    editor: "input",
+    editorParams: {
+      selectContents: true,
+    },
+    field: "Name",
+    formatter: "plaintext",
+    headerHozAlign: "left",
+    headerSort: false,
+    headerWordWrap: true,
+    hozAlign: "left",
+    minWidth: 100,
+    resizable: false,
+    title: "Name",
+  });
+  assert.equal(columns[3]!["columns"]!.length, 5);
+  assert.deepEqual(columns[3]!["columns"]![0], {
+    editor: "input",
+    editorParams: {
+      selectContents: true,
+    },
+    field: "Maximum power (MW) 00:00",
+    formatter: floatFormatter,
+    headerHozAlign: "left",
+    headerSort: false,
+    headerWordWrap: true,
+    hozAlign: "left",
+    minWidth: 75,
+    resizable: false,
+    title: "00:00",
+  });
+});

web/frontend/src/components/CaseBuilder/ProfiledUnits.tsx

@@ -0,0 +1,197 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import SectionHeader from "../Common/SectionHeader/SectionHeader";
+import SectionButton from "../Common/Buttons/SectionButton";
+import {
+  faDownload,
+  faPlus,
+  faUpload,
+} from "@fortawesome/free-solid-svg-icons";
+import DataTable, {
+  ColumnSpec,
+  generateCsv,
+  generateTableColumns,
+  generateTableData,
+  parseCsv,
+} from "../Common/Forms/DataTable";
+import { ColumnDefinition } from "tabulator-tables";
+import { offerDownload } from "../Common/io";
+import FileUploadElement from "../Common/Buttons/FileUploadElement";
+import { useRef } from "react";
+import {
+  changeProfiledUnitData,
+  createProfiledUnit,
+  deleteGenerator,
+  renameGenerator,
+} from "../../core/Operations/generatorOps";
+import { ValidationError } from "../../core/Data/validate";
+import { CaseBuilderSectionProps } from "./CaseBuilder";
+import {
+  getProfiledGenerators,
+  getThermalGenerators,
+  UnitCommitmentScenario,
+} from "../../core/Data/types";
+
+export const ProfiledUnitsColumnSpec: ColumnSpec[] = [
+  {
+    title: "Name",
+    type: "string",
+    width: 100,
+  },
+  {
+    title: "Bus",
+    type: "busRef",
+    width: 100,
+  },
+  {
+    title: "Cost ($/MW)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Maximum power (MW)",
+    type: "number[T]",
+    width: 75,
+  },
+  {
+    title: "Minimum power (MW)",
+    type: "number[T]",
+    width: 75,
+  },
+];
+
+const generateProfiledUnitsData = (
+  scenario: UnitCommitmentScenario,
+): [any[], ColumnDefinition[]] => {
+  const columns = generateTableColumns(scenario, ProfiledUnitsColumnSpec);
+  const data = generateTableData(
+    getProfiledGenerators(scenario),
+    ProfiledUnitsColumnSpec,
+    scenario,
+  );
+  return [data, columns];
+};
+
+export const parseProfiledUnitsCsv = (
+  csvContents: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [profGens, err] = parseCsv(
+    csvContents,
+    ProfiledUnitsColumnSpec,
+    scenario,
+  );
+  if (err) return [scenario, err];
+
+  // Process imported generators
+  for (const gen in profGens) {
+    profGens[gen]["Type"] = "Profiled";
+  }
+
+  // Merge with existing data
+  const thermalGens = getThermalGenerators(scenario);
+  const newScenario = {
+    ...scenario,
+    Generators: { ...thermalGens, ...profGens },
+  };
+  return [newScenario, null];
+};
+
+const ProfiledUnitsComponent = (props: CaseBuilderSectionProps) => {
+  const fileUploadElem = useRef<FileUploadElement>(null);
+
+  const onDownload = () => {
+    const [data, columns] = generateProfiledUnitsData(props.scenario);
+    const csvContents = generateCsv(data, columns);
+    offerDownload(csvContents, "text/csv", "profiled_units.csv");
+  };
+
+  const onUpload = () => {
+    fileUploadElem.current!.showFilePicker((csv: any) => {
+      const [newScenario, err] = parseProfiledUnitsCsv(csv, props.scenario);
+      if (err) {
+        props.onError(err.message);
+        return;
+      }
+      props.onDataChanged(newScenario);
+    });
+  };
+
+  const onAdd = () => {
+    const [newScenario, err] = createProfiledUnit(props.scenario);
+    if (err) {
+      props.onError(err.message);
+      return;
+    }
+    props.onDataChanged(newScenario);
+  };
+
+  const onDelete = (name: string): ValidationError | null => {
+    const newScenario = deleteGenerator(name, props.scenario);
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onDataChanged = (
+    name: string,
+    field: string,
+    newValue: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = changeProfiledUnitData(
+      name,
+      field,
+      newValue,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onRename = (
+    oldName: string,
+    newName: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = renameGenerator(
+      oldName,
+      newName,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  return (
+    <div>
+      <SectionHeader title="Profiled units">
+        <SectionButton icon={faPlus} tooltip="Add" onClick={onAdd} />
+        <SectionButton
+          icon={faDownload}
+          tooltip="Download"
+          onClick={onDownload}
+        />
+        <SectionButton icon={faUpload} tooltip="Upload" onClick={onUpload} />
+      </SectionHeader>
+      <DataTable
+        onRowDeleted={onDelete}
+        onRowRenamed={onRename}
+        onDataChanged={onDataChanged}
+        generateData={() => generateProfiledUnitsData(props.scenario)}
+      />
+      <FileUploadElement ref={fileUploadElem} accept=".csv" />
+    </div>
+  );
+};
+
+export default ProfiledUnitsComponent;

web/frontend/src/components/CaseBuilder/Psload.tsx

@@ -0,0 +1,175 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import DataTable, {
+  ColumnSpec,
+  generateCsv,
+  generateTableColumns,
+  generateTableData,
+  parseCsv,
+} from "../Common/Forms/DataTable";
+import { CaseBuilderSectionProps } from "./CaseBuilder";
+import { useRef } from "react";
+import FileUploadElement from "../Common/Buttons/FileUploadElement";
+import { ValidationError } from "../../core/Data/validate";
+import SectionHeader from "../Common/SectionHeader/SectionHeader";
+import SectionButton from "../Common/Buttons/SectionButton";
+import {
+  faDownload,
+  faPlus,
+  faUpload,
+} from "@fortawesome/free-solid-svg-icons";
+import { UnitCommitmentScenario } from "../../core/Data/types";
+import { ColumnDefinition } from "tabulator-tables";
+import {
+  changePriceSensitiveLoadData,
+  createPriceSensitiveLoad,
+  deletePriceSensitiveLoad,
+  renamePriceSensitiveLoad,
+} from "../../core/Operations/psloadOps";
+import { offerDownload } from "../Common/io";
+
+export const PriceSensitiveLoadsColumnSpec: ColumnSpec[] = [
+  {
+    title: "Name",
+    type: "string",
+    width: 100,
+  },
+  {
+    title: "Bus",
+    type: "busRef",
+    width: 100,
+  },
+  {
+    title: "Revenue ($/MW)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Demand (MW)",
+    type: "number[T]",
+    width: 70,
+  },
+];
+
+export const generatePriceSensitiveLoadsData = (
+  scenario: UnitCommitmentScenario,
+): [any[], ColumnDefinition[]] => {
+  const columns = generateTableColumns(scenario, PriceSensitiveLoadsColumnSpec);
+  const data = generateTableData(
+    scenario["Price-sensitive loads"],
+    PriceSensitiveLoadsColumnSpec,
+    scenario,
+  );
+  return [data, columns];
+};
+
+const PriceSensitiveLoadsComponent = (props: CaseBuilderSectionProps) => {
+  const fileUploadElem = useRef<FileUploadElement>(null);
+
+  const onDownload = () => {
+    const [data, columns] = generatePriceSensitiveLoadsData(props.scenario);
+    const csvContents = generateCsv(data, columns);
+    offerDownload(csvContents, "text/csv", "psloads.csv");
+  };
+
+  const onUpload = () => {
+    fileUploadElem.current!.showFilePicker((csv: any) => {
+      // Parse provided CSV file
+      const [psloads, err] = parseCsv(
+        csv,
+        PriceSensitiveLoadsColumnSpec,
+        props.scenario,
+      );
+
+      // Handle validation errors
+      if (err) {
+        props.onError(err.message);
+        return;
+      }
+
+      // Generate new scenario
+      props.onDataChanged({
+        ...props.scenario,
+        "Price-sensitive loads": psloads,
+      });
+    });
+  };
+
+  const onAdd = () => {
+    const [newScenario, err] = createPriceSensitiveLoad(props.scenario);
+    if (err) {
+      props.onError(err.message);
+      return;
+    }
+    props.onDataChanged(newScenario);
+  };
+
+  const onDelete = (name: string): ValidationError | null => {
+    const newScenario = deletePriceSensitiveLoad(name, props.scenario);
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onDataChanged = (
+    name: string,
+    field: string,
+    newValue: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = changePriceSensitiveLoadData(
+      name,
+      field,
+      newValue,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onRename = (
+    oldName: string,
+    newName: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = renamePriceSensitiveLoad(
+      oldName,
+      newName,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  return (
+    <div>
+      <SectionHeader title="Price-sensitive loads">
+        <SectionButton icon={faPlus} tooltip="Add" onClick={onAdd} />
+        <SectionButton
+          icon={faDownload}
+          tooltip="Download"
+          onClick={onDownload}
+        />
+        <SectionButton icon={faUpload} tooltip="Upload" onClick={onUpload} />
+      </SectionHeader>
+      <DataTable
+        onRowDeleted={onDelete}
+        onRowRenamed={onRename}
+        onDataChanged={onDataChanged}
+        generateData={() => generatePriceSensitiveLoadsData(props.scenario)}
+      />
+      <FileUploadElement ref={fileUploadElem} accept=".csv" />
+    </div>
+  );
+};
+
+export default PriceSensitiveLoadsComponent;

web/frontend/src/components/CaseBuilder/StorageUnits.tsx

@@ -0,0 +1,235 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import DataTable, {
+  ColumnSpec,
+  generateCsv,
+  generateTableColumns,
+  generateTableData,
+  parseCsv,
+} from "../Common/Forms/DataTable";
+import { CaseBuilderSectionProps } from "./CaseBuilder";
+import { useRef } from "react";
+import FileUploadElement from "../Common/Buttons/FileUploadElement";
+import { ValidationError } from "../../core/Data/validate";
+import SectionHeader from "../Common/SectionHeader/SectionHeader";
+import SectionButton from "../Common/Buttons/SectionButton";
+import {
+  faDownload,
+  faPlus,
+  faUpload,
+} from "@fortawesome/free-solid-svg-icons";
+import { UnitCommitmentScenario } from "../../core/Data/types";
+import { ColumnDefinition } from "tabulator-tables";
+import {
+  changeStorageUnitData,
+  createStorageUnit,
+  deleteStorageUnit,
+  renameStorageUnit,
+} from "../../core/Operations/storageOps";
+import { offerDownload } from "../Common/io";
+
+export const StorageUnitsColumnSpec: ColumnSpec[] = [
+  {
+    title: "Name",
+    type: "string",
+    width: 100,
+  },
+  {
+    title: "Bus",
+    type: "busRef",
+    width: 100,
+  },
+  {
+    title: "Minimum level (MWh)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Maximum level (MWh)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Charge cost ($/MW)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Discharge cost ($/MW)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Charge efficiency",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Discharge efficiency",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Loss factor",
+    type: "number",
+    width: 80,
+  },
+  {
+    title: "Minimum charge rate (MW)",
+    type: "number",
+    width: 140,
+  },
+  {
+    title: "Maximum charge rate (MW)",
+    type: "number",
+    width: 140,
+  },
+  {
+    title: "Minimum discharge rate (MW)",
+    type: "number",
+    width: 140,
+  },
+  {
+    title: "Maximum discharge rate (MW)",
+    type: "number",
+    width: 150,
+  },
+  {
+    title: "Initial level (MWh)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Last period minimum level (MWh)",
+    type: "number",
+    width: 160,
+  },
+  {
+    title: "Last period maximum level (MWh)",
+    type: "number",
+    width: 160,
+  },
+];
+
+export const generateStorageUnitsData = (
+  scenario: UnitCommitmentScenario,
+): [any[], ColumnDefinition[]] => {
+  const columns = generateTableColumns(scenario, StorageUnitsColumnSpec);
+  const data = generateTableData(
+    scenario["Storage units"],
+    StorageUnitsColumnSpec,
+    scenario,
+  );
+  return [data, columns];
+};
+
+const StorageUnitsComponent = (props: CaseBuilderSectionProps) => {
+  const fileUploadElem = useRef<FileUploadElement>(null);
+
+  const onDownload = () => {
+    const [data, columns] = generateStorageUnitsData(props.scenario);
+    const csvContents = generateCsv(data, columns);
+    offerDownload(csvContents, "text/csv", "storage_units.csv");
+  };
+
+  const onUpload = () => {
+    fileUploadElem.current!.showFilePicker((csv: any) => {
+      // Parse provided CSV file
+      const [storageUnits, err] = parseCsv(
+        csv,
+        StorageUnitsColumnSpec,
+        props.scenario,
+      );
+
+      // Handle validation errors
+      if (err) {
+        props.onError(err.message);
+        return;
+      }
+
+      // Generate new scenario
+      props.onDataChanged({
+        ...props.scenario,
+        "Storage units": storageUnits,
+      });
+    });
+  };
+
+  const onAdd = () => {
+    const [newScenario, err] = createStorageUnit(props.scenario);
+    if (err) {
+      props.onError(err.message);
+      return;
+    }
+    props.onDataChanged(newScenario);
+  };
+
+  const onDelete = (name: string): ValidationError | null => {
+    const newScenario = deleteStorageUnit(name, props.scenario);
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onDataChanged = (
+    name: string,
+    field: string,
+    newValue: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = changeStorageUnitData(
+      name,
+      field,
+      newValue,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onRename = (
+    oldName: string,
+    newName: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = renameStorageUnit(
+      oldName,
+      newName,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  return (
+    <div>
+      <SectionHeader title="Storage units">
+        <SectionButton icon={faPlus} tooltip="Add" onClick={onAdd} />
+        <SectionButton
+          icon={faDownload}
+          tooltip="Download"
+          onClick={onDownload}
+        />
+        <SectionButton icon={faUpload} tooltip="Upload" onClick={onUpload} />
+      </SectionHeader>
+      <DataTable
+        onRowDeleted={onDelete}
+        onRowRenamed={onRename}
+        onDataChanged={onDataChanged}
+        generateData={() => generateStorageUnitsData(props.scenario)}
+      />
+      <FileUploadElement ref={fileUploadElem} accept=".csv" />
+    </div>
+  );
+};
+
+export default StorageUnitsComponent;

web/frontend/src/components/CaseBuilder/ThermalUnits.test.ts

@@ -0,0 +1,209 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import {
+  floatFormatter,
+  generateCsv,
+  generateTableColumns,
+  generateTableData,
+} from "../Common/Forms/DataTable";
+import { TEST_DATA_1 } from "../../core/Data/fixtures.test";
+import {
+  generateThermalUnitsData,
+  parseThermalUnitsCsv,
+  ThermalUnitsColumnSpec,
+} from "./ThermalUnits";
+import assert from "node:assert";
+import {
+  getProfiledGenerators,
+  getThermalGenerators,
+} from "../../core/Data/types";
+
+test("generateTableColumns", () => {
+  const columns = generateTableColumns(TEST_DATA_1, ThermalUnitsColumnSpec);
+  assert.equal(columns[2]!["columns"]!.length, 10);
+  assert.deepEqual(columns[2]!["columns"]![0], {
+    editor: "input",
+    editorParams: {
+      selectContents: true,
+    },
+    field: "Production cost curve (MW) 1",
+    formatter: floatFormatter,
+    headerHozAlign: "left",
+    headerSort: false,
+    headerWordWrap: true,
+    hozAlign: "left",
+    minWidth: 80,
+    resizable: false,
+    title: "1",
+  });
+});
+
+test("generateTableData", () => {
+  const data = generateTableData(
+    getThermalGenerators(TEST_DATA_1),
+    ThermalUnitsColumnSpec,
+    TEST_DATA_1,
+  );
+  assert.deepEqual(data[0], {
+    Name: "g1",
+    Bus: "b1",
+    "Initial power (MW)": 115,
+    "Initial status (h)": 12,
+    "Minimum downtime (h)": 4,
+    "Minimum uptime (h)": 4,
+    "Ramp down limit (MW)": 232.68,
+    "Ramp up limit (MW)": 232.68,
+    "Shutdown limit (MW)": 232.68,
+    "Startup limit (MW)": 232.68,
+    "Production cost curve ($) 1": 1400,
+    "Production cost curve ($) 2": 1600,
+    "Production cost curve ($) 3": 2200,
+    "Production cost curve ($) 4": 2400,
+    "Production cost curve ($) 5": "",
+    "Production cost curve ($) 6": "",
+    "Production cost curve ($) 7": "",
+    "Production cost curve ($) 8": "",
+    "Production cost curve ($) 9": "",
+    "Production cost curve ($) 10": "",
+    "Production cost curve (MW) 1": 100,
+    "Production cost curve (MW) 2": 110,
+    "Production cost curve (MW) 3": 130,
+    "Production cost curve (MW) 4": 135,
+    "Production cost curve (MW) 5": "",
+    "Production cost curve (MW) 6": "",
+    "Production cost curve (MW) 7": "",
+    "Production cost curve (MW) 8": "",
+    "Production cost curve (MW) 9": "",
+    "Production cost curve (MW) 10": "",
+    "Startup costs ($) 1": 300,
+    "Startup costs ($) 2": 400,
+    "Startup costs ($) 3": "",
+    "Startup costs ($) 4": "",
+    "Startup costs ($) 5": "",
+    "Startup delays (h) 1": 1,
+    "Startup delays (h) 2": 4,
+    "Startup delays (h) 3": "",
+    "Startup delays (h) 4": "",
+    "Startup delays (h) 5": "",
+    "Must run?": false,
+  });
+});
+
+const expectedCsvContents =
+  "Name,Bus," +
+  "Production cost curve (MW) 1," +
+  "Production cost curve (MW) 2," +
+  "Production cost curve (MW) 3," +
+  "Production cost curve (MW) 4," +
+  "Production cost curve (MW) 5," +
+  "Production cost curve (MW) 6," +
+  "Production cost curve (MW) 7," +
+  "Production cost curve (MW) 8," +
+  "Production cost curve (MW) 9," +
+  "Production cost curve (MW) 10," +
+  "Production cost curve ($) 1," +
+  "Production cost curve ($) 2," +
+  "Production cost curve ($) 3," +
+  "Production cost curve ($) 4," +
+  "Production cost curve ($) 5," +
+  "Production cost curve ($) 6," +
+  "Production cost curve ($) 7," +
+  "Production cost curve ($) 8," +
+  "Production cost curve ($) 9," +
+  "Production cost curve ($) 10," +
+  "Startup costs ($) 1," +
+  "Startup costs ($) 2," +
+  "Startup costs ($) 3," +
+  "Startup costs ($) 4," +
+  "Startup costs ($) 5," +
+  "Startup delays (h) 1," +
+  "Startup delays (h) 2," +
+  "Startup delays (h) 3," +
+  "Startup delays (h) 4," +
+  "Startup delays (h) 5," +
+  "Minimum uptime (h),Minimum downtime (h),Ramp up limit (MW)," +
+  "Ramp down limit (MW),Startup limit (MW),Shutdown limit (MW)," +
+  "Initial status (h),Initial power (MW),Must run?\n" +
+  "g1,b1,100,110,130,135,,,,,,,1400,1600,2200,2400,,,,,,,300,400,,,,1,4,,,,4,4,232.68,232.68,232.68,232.68,12,115,false";
+
+const invalidCsv =
+  "Name,Bus," +
+  "Production cost curve (MW) 1," +
+  "Production cost curve (MW) 2," +
+  "Production cost curve (MW) 3," +
+  "Production cost curve (MW) 4," +
+  "Production cost curve (MW) 5," +
+  "Production cost curve (MW) 6," +
+  "Production cost curve (MW) 7," +
+  "Production cost curve (MW) 8," +
+  "Production cost curve (MW) 9," +
+  "Production cost curve (MW) 10," +
+  "Production cost curve ($) 1," +
+  "Production cost curve ($) 2," +
+  "Production cost curve ($) 3," +
+  "Production cost curve ($) 4," +
+  "Production cost curve ($) 5," +
+  "Production cost curve ($) 6," +
+  "Production cost curve ($) 7," +
+  "Production cost curve ($) 8," +
+  "Production cost curve ($) 9," +
+  "Production cost curve ($) 10," +
+  "Startup costs ($) 1," +
+  "Startup costs ($) 2," +
+  "Startup costs ($) 3," +
+  "Startup costs ($) 4," +
+  "Startup costs ($) 5," +
+  "Startup delays (h) 1," +
+  "Startup delays (h) 2," +
+  "Startup delays (h) 3," +
+  "Startup delays (h) 4," +
+  "Startup delays (h) 5," +
+  "Minimum uptime (h),Minimum downtime (h),Ramp up limit (MW)," +
+  "Ramp down limit (MW),Startup limit (MW),Shutdown limit (MW)," +
+  "Initial status (h),Initial power (MW),Must run?\n" +
+  "g1,b1,100,110,130,x,,,,,,,1400,1600,2200,2400,,,,,,,300,400,,,,1,4,,,,4,4,232.68,232.68,232.68,232.68,12,115,false";
+
+test("generateCSV", () => {
+  const [data, columns] = generateThermalUnitsData(TEST_DATA_1);
+  const actualCsvContents = generateCsv(data, columns);
+  assert.equal(actualCsvContents, expectedCsvContents);
+});
+
+test("parseCSV", () => {
+  const [scenario, err] = parseThermalUnitsCsv(
+    expectedCsvContents,
+    TEST_DATA_1,
+  );
+  assert(!err);
+  const thermalGens = getThermalGenerators(scenario);
+  const profGens = getProfiledGenerators(scenario);
+  assert.equal(Object.keys(thermalGens).length, 1);
+  assert.equal(Object.keys(profGens).length, 2);
+  assert.deepEqual(thermalGens["g1"], {
+    Bus: "b1",
+    Type: "Thermal",
+    "Production cost curve (MW)": [100.0, 110.0, 130.0, 135.0],
+    "Production cost curve ($)": [1400.0, 1600.0, 2200.0, 2400.0],
+    "Startup costs ($)": [300.0, 400.0],
+    "Startup delays (h)": [1, 4],
+    "Ramp up limit (MW)": 232.68,
+    "Ramp down limit (MW)": 232.68,
+    "Startup limit (MW)": 232.68,
+    "Shutdown limit (MW)": 232.68,
+    "Minimum downtime (h)": 4,
+    "Minimum uptime (h)": 4,
+    "Initial status (h)": 12,
+    "Initial power (MW)": 115,
+    "Must run?": false,
+  });
+});
+
+test("parseCSV with invalid number[T]", () => {
+  const [, err] = parseThermalUnitsCsv(invalidCsv, TEST_DATA_1);
+  assert(err);
+  assert.equal(err.message, '"x" is not a valid number (row 1)');
+});

web/frontend/src/components/CaseBuilder/ThermalUnits.tsx

@@ -0,0 +1,251 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import DataTable, {
+  ColumnSpec,
+  generateCsv,
+  generateTableColumns,
+  generateTableData,
+  parseCsv,
+} from "../Common/Forms/DataTable";
+import { CaseBuilderSectionProps } from "./CaseBuilder";
+import { useRef } from "react";
+import FileUploadElement from "../Common/Buttons/FileUploadElement";
+import { ValidationError } from "../../core/Data/validate";
+import SectionHeader from "../Common/SectionHeader/SectionHeader";
+import SectionButton from "../Common/Buttons/SectionButton";
+import {
+  faDownload,
+  faPlus,
+  faUpload,
+} from "@fortawesome/free-solid-svg-icons";
+import { ColumnDefinition } from "tabulator-tables";
+import { offerDownload } from "../Common/io";
+import {
+  changeThermalUnitData,
+  createThermalUnit,
+  deleteGenerator,
+  renameGenerator,
+} from "../../core/Operations/generatorOps";
+import {
+  getProfiledGenerators,
+  getThermalGenerators,
+  UnitCommitmentScenario,
+} from "../../core/Data/types";
+
+export const ThermalUnitsColumnSpec: ColumnSpec[] = [
+  {
+    title: "Name",
+    type: "string",
+    width: 100,
+  },
+  {
+    title: "Bus",
+    type: "busRef",
+    width: 100,
+  },
+  {
+    title: "Production cost curve (MW)",
+    type: "number[N]",
+    length: 10,
+    width: 80,
+  },
+  {
+    title: "Production cost curve ($)",
+    type: "number[N]",
+    length: 10,
+    width: 80,
+  },
+  {
+    title: "Startup costs ($)",
+    type: "number[N]",
+    length: 5,
+    width: 75,
+  },
+  {
+    title: "Startup delays (h)",
+    type: "number[N]",
+    length: 5,
+    width: 60,
+  },
+  {
+    title: "Minimum uptime (h)",
+    type: "number",
+    width: 80,
+  },
+  {
+    title: "Minimum downtime (h)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Ramp up limit (MW)",
+    type: "number?",
+    width: 100,
+  },
+  {
+    title: "Ramp down limit (MW)",
+    type: "number?",
+    width: 100,
+  },
+  {
+    title: "Startup limit (MW)",
+    type: "number?",
+    width: 80,
+  },
+  {
+    title: "Shutdown limit (MW)",
+    type: "number?",
+    width: 100,
+  },
+  {
+    title: "Initial status (h)",
+    type: "number",
+    width: 80,
+  },
+  {
+    title: "Initial power (MW)",
+    type: "number",
+    width: 100,
+  },
+  {
+    title: "Must run?",
+    type: "boolean",
+    width: 80,
+  },
+];
+
+export const generateThermalUnitsData = (
+  scenario: UnitCommitmentScenario,
+): [any[], ColumnDefinition[]] => {
+  const columns = generateTableColumns(scenario, ThermalUnitsColumnSpec);
+  const data = generateTableData(
+    getThermalGenerators(scenario),
+    ThermalUnitsColumnSpec,
+    scenario,
+  );
+  return [data, columns];
+};
+
+export const parseThermalUnitsCsv = (
+  csvContents: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [thermalGens, err] = parseCsv(
+    csvContents,
+    ThermalUnitsColumnSpec,
+    scenario,
+  );
+  if (err) return [scenario, err];
+
+  // Process imported generators
+  for (const gen in thermalGens) {
+    thermalGens[gen]["Type"] = "Thermal";
+  }
+
+  // Merge with existing data
+  const profGens = getProfiledGenerators(scenario);
+  const newScenario = {
+    ...scenario,
+    Generators: { ...thermalGens, ...profGens },
+  };
+  return [newScenario, null];
+};
+
+const ThermalUnitsComponent = (props: CaseBuilderSectionProps) => {
+  const fileUploadElem = useRef<FileUploadElement>(null);
+
+  const onDownload = () => {
+    const [data, columns] = generateThermalUnitsData(props.scenario);
+    const csvContents = generateCsv(data, columns);
+    offerDownload(csvContents, "text/csv", "thermal_units.csv");
+  };
+
+  const onUpload = () => {
+    fileUploadElem.current!.showFilePicker((csv: any) => {
+      const [newScenario, err] = parseThermalUnitsCsv(csv, props.scenario);
+      if (err) {
+        props.onError(err.message);
+        return;
+      }
+      props.onDataChanged(newScenario);
+    });
+  };
+
+  const onAdd = () => {
+    const [newScenario, err] = createThermalUnit(props.scenario);
+    if (err) {
+      props.onError(err.message);
+      return;
+    }
+    props.onDataChanged(newScenario);
+  };
+
+  const onDelete = (name: string): ValidationError | null => {
+    const newScenario = deleteGenerator(name, props.scenario);
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onDataChanged = (
+    name: string,
+    field: string,
+    newValue: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = changeThermalUnitData(
+      name,
+      field,
+      newValue,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onRename = (
+    oldName: string,
+    newName: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = renameGenerator(
+      oldName,
+      newName,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  return (
+    <div>
+      <SectionHeader title="Thermal units">
+        <SectionButton icon={faPlus} tooltip="Add" onClick={onAdd} />
+        <SectionButton
+          icon={faDownload}
+          tooltip="Download"
+          onClick={onDownload}
+        />
+        <SectionButton icon={faUpload} tooltip="Upload" onClick={onUpload} />
+      </SectionHeader>
+      <DataTable
+        onRowDeleted={onDelete}
+        onRowRenamed={onRename}
+        onDataChanged={onDataChanged}
+        generateData={() => generateThermalUnitsData(props.scenario)}
+      />
+      <FileUploadElement ref={fileUploadElem} accept=".csv" />
+    </div>
+  );
+};
+
+export default ThermalUnitsComponent;

web/frontend/src/components/CaseBuilder/TransmissionLines.tsx

@@ -0,0 +1,203 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import SectionHeader from "../Common/SectionHeader/SectionHeader";
+import SectionButton from "../Common/Buttons/SectionButton";
+import {
+  faDownload,
+  faPlus,
+  faUpload,
+} from "@fortawesome/free-solid-svg-icons";
+import DataTable, {
+  ColumnSpec,
+  generateCsv,
+  generateTableColumns,
+  generateTableData,
+  parseCsv,
+} from "../Common/Forms/DataTable";
+import { ColumnDefinition } from "tabulator-tables";
+import FileUploadElement from "../Common/Buttons/FileUploadElement";
+import { useRef } from "react";
+import { ValidationError } from "../../core/Data/validate";
+import { CaseBuilderSectionProps } from "./CaseBuilder";
+import {
+  changeTransmissionLineData,
+  createTransmissionLine,
+  deleteTransmissionLine,
+  rebuildContingencies,
+  renameTransmissionLine,
+} from "../../core/Operations/transmissionOps";
+import { offerDownload } from "../Common/io";
+import { UnitCommitmentScenario } from "../../core/Data/types";
+
+export const TransmissionLinesColumnSpec: ColumnSpec[] = [
+  {
+    title: "Name",
+    type: "string",
+    width: 100,
+  },
+  {
+    title: "Source bus",
+    type: "busRef",
+    width: 100,
+  },
+  {
+    title: "Target bus",
+    type: "busRef",
+    width: 100,
+  },
+  {
+    title: "Susceptance (S)",
+    type: "number",
+    width: 60,
+  },
+  {
+    title: "Normal flow limit (MW)",
+    type: "number?",
+    width: 60,
+  },
+  {
+    title: "Emergency flow limit (MW)",
+    type: "number?",
+    width: 60,
+  },
+  {
+    title: "Flow limit penalty ($/MW)",
+    type: "number",
+    width: 60,
+  },
+  {
+    title: "Contingency?",
+    type: "lineContingency",
+    width: 50,
+  },
+];
+
+const generateTransmissionLinesData = (
+  scenario: UnitCommitmentScenario,
+): [any[], ColumnDefinition[]] => {
+  const columns = generateTableColumns(scenario, TransmissionLinesColumnSpec);
+  const data = generateTableData(
+    scenario["Transmission lines"],
+    TransmissionLinesColumnSpec,
+    scenario,
+  );
+  return [data, columns];
+};
+
+const TransmissionLinesComponent = (props: CaseBuilderSectionProps) => {
+  const fileUploadElem = useRef<FileUploadElement>(null);
+
+  const onDownload = () => {
+    const [data, columns] = generateTransmissionLinesData(props.scenario);
+    const csvContents = generateCsv(data, columns);
+    offerDownload(csvContents, "text/csv", "transmission.csv");
+  };
+
+  const onUpload = () => {
+    fileUploadElem.current!.showFilePicker((csv: any) => {
+      // Parse the CSV data
+      const [newLines, err] = parseCsv(
+        csv,
+        TransmissionLinesColumnSpec,
+        props.scenario,
+      );
+      if (err) {
+        props.onError(err.message);
+        return;
+      }
+
+      // Remove contingency field from line and rebuild the contingencies section
+      const lineContingencies = new Set<String>();
+      Object.entries(newLines).forEach(([lineName, line]: [string, any]) => {
+        if (line["Contingency?"]) lineContingencies.add(lineName);
+        delete line["Contingency?"];
+      });
+      const contingencies = rebuildContingencies(lineContingencies);
+
+      const newScenario = {
+        ...props.scenario,
+        "Transmission lines": newLines,
+        Contingencies: contingencies,
+      };
+      props.onDataChanged(newScenario);
+    });
+  };
+
+  const onAdd = () => {
+    const [newScenario, err] = createTransmissionLine(props.scenario);
+    if (err) {
+      props.onError(err.message);
+      return;
+    }
+    props.onDataChanged(newScenario);
+  };
+
+  const onDelete = (name: string): ValidationError | null => {
+    const newScenario = deleteTransmissionLine(name, props.scenario);
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onDataChanged = (
+    name: string,
+    field: string,
+    newValue: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = changeTransmissionLineData(
+      name,
+      field,
+      newValue,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  const onRename = (
+    oldName: string,
+    newName: string,
+  ): ValidationError | null => {
+    const [newScenario, err] = renameTransmissionLine(
+      oldName,
+      newName,
+      props.scenario,
+    );
+    if (err) {
+      props.onError(err.message);
+      return err;
+    }
+    props.onDataChanged(newScenario);
+    return null;
+  };
+
+  return (
+    <div>
+      <SectionHeader title="Transmission lines">
+        <SectionButton icon={faPlus} tooltip="Add" onClick={onAdd} />
+        <SectionButton
+          icon={faDownload}
+          tooltip="Download"
+          onClick={onDownload}
+        />
+        <SectionButton icon={faUpload} tooltip="Upload" onClick={onUpload} />
+      </SectionHeader>
+      <DataTable
+        onRowDeleted={onDelete}
+        onRowRenamed={onRename}
+        onDataChanged={onDataChanged}
+        generateData={() => generateTransmissionLinesData(props.scenario)}
+      />
+      <FileUploadElement ref={fileUploadElem} accept=".csv" />
+    </div>
+  );
+};
+
+export default TransmissionLinesComponent;

web/frontend/src/components/Common/Buttons/FileUploadElement.tsx

@@ -0,0 +1,58 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import pako from "pako";
+import React, { Component } from "react";
+
+class FileUploadElement extends Component<any> {
+  private inputRef = React.createRef<HTMLInputElement>();
+  private callback: (data: any) => void = () => {};
+
+  showFilePicker = (callback: (data: any) => void) => {
+    this.callback = callback;
+    this.inputRef.current?.click();
+  };
+
+  onFileSelected = (event: React.ChangeEvent<HTMLInputElement>) => {
+    const file = event.target.files![0]!;
+    let isCompressed = file.name.endsWith(".gz");
+    if (file) {
+      const reader = new FileReader();
+      reader.onload = async (e) => {
+        let content = e.target?.result;
+
+        if (isCompressed) {
+          const compressed = new Uint8Array(content as ArrayBuffer);
+          const decompressed = pako.inflate(compressed);
+          content = new TextDecoder().decode(decompressed);
+        }
+
+        this.callback(content as string);
+        this.callback = () => {};
+      };
+      if (isCompressed) {
+        reader.readAsArrayBuffer(file);
+      } else {
+        reader.readAsText(file);
+      }
+    }
+    event.target.value = "";
+  };
+
+  override render() {
+    return (
+      <input
+        ref={this.inputRef}
+        type="file"
+        accept={this.props.accept}
+        style={{ display: "none" }}
+        onChange={this.onFileSelected}
+      />
+    );
+  }
+}
+
+export default FileUploadElement;

web/frontend/src/components/Common/Buttons/HelpButton.module.css

@@ -0,0 +1,43 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.tooltip {
+  visibility: hidden;
+  background-color: var(--contrast-80);
+  color: var(--contrast-10);
+  opacity: 0;
+  width: 250px;
+  margin-top: 36px;
+  margin-left: -250px;
+  position: absolute;
+  z-index: 100;
+  font-size: 14px;
+  border-radius: var(--border-radius);
+  box-shadow: var(--box-shadow);
+  line-height: 20px;
+  transition: opacity 0.5s;
+  font-weight: normal;
+  text-align: left;
+  padding: 6px 12px;
+}
+
+.icon {
+  color: var(--contrast-60);
+  font-size: 16px;
+  padding: 8px 8px 8px 0;
+}
+
+.HelpButton {
+  border: 0;
+  background-color: transparent;
+  cursor: pointer;
+}
+
+.HelpButton:hover .tooltip {
+  visibility: visible;
+  opacity: 100%;
+  transition: opacity 0.5s;
+}

web/frontend/src/components/Common/Buttons/HelpButton.tsx

@@ -0,0 +1,22 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import styles from "./HelpButton.module.css";
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import { faCircleQuestion } from "@fortawesome/free-regular-svg-icons";
+
+function HelpButton({ text }: { text: String }) {
+  return (
+    <button className={styles.HelpButton}>
+      <span className={styles.tooltip}>{text}</span>
+      <span className={styles.icon}>
+        <FontAwesomeIcon icon={faCircleQuestion} />
+      </span>
+    </button>
+  );
+}
+
+export default HelpButton;

web/frontend/src/components/Common/Buttons/SectionButton.module.css

@@ -0,0 +1,26 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.SectionButton {
+  height: 48px;
+  width: 48px;
+  font-size: 16px;
+  border: 0;
+  background-color: transparent;
+  margin: 8px 0 8px 0px;
+  cursor: pointer;
+  color: var(--contrast-60);
+}
+
+.SectionButton:hover {
+  color: var(--contrast-100);
+  background-color: var(--contrast-20);
+  border-radius: var(--border-radius);
+}
+
+.SectionButton:active {
+  background-color: var(--contrast-60);
+}

web/frontend/src/components/Common/Buttons/SectionButton.tsx

@@ -0,0 +1,29 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { IconDefinition } from "@fortawesome/fontawesome-svg-core";
+import { FontAwesomeIcon } from "@fortawesome/react-fontawesome";
+import styles from "./SectionButton.module.css";
+
+interface SectionButtonProps {
+  icon: IconDefinition;
+  tooltip: string;
+  onClick?: () => void;
+}
+
+function SectionButton(props: SectionButtonProps) {
+  return (
+    <button
+      className={styles.SectionButton}
+      title={props.tooltip}
+      onClick={props.onClick}
+    >
+      <FontAwesomeIcon icon={props.icon} />
+    </button>
+  );
+}
+
+export default SectionButton;

web/frontend/src/components/Common/Buttons/SiteHeaderButton.module.css

@@ -0,0 +1,28 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.SiteHeaderButton {
+  padding: 6px 24px;
+  margin: 0 0 0 8px;
+  line-height: 24px;
+  border: var(--box-border);
+  box-shadow: var(--box-shadow);
+  border-radius: var(--border-radius);
+  cursor: pointer;
+  color: var(--contrast-80);
+  text-transform: uppercase;
+  font-weight: bold;
+  font-size: 12px;
+  background: linear-gradient(var(--contrast-0) 25%, var(--contrast-10) 100%);
+}
+
+.SiteHeaderButton:hover {
+  background: rgb(245, 245, 245);
+}
+
+.SiteHeaderButton:active {
+  background: rgba(220, 220, 220);
+}

web/frontend/src/components/Common/Buttons/SiteHeaderButton.tsx

@@ -0,0 +1,23 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import styles from "./SiteHeaderButton.module.css";
+
+function SiteHeaderButton({
+  title,
+  onClick,
+}: {
+  title: string;
+  onClick?: () => void;
+}) {
+  return (
+    <button className={styles.SiteHeaderButton} onClick={onClick}>
+      {title}
+    </button>
+  );
+}
+
+export default SiteHeaderButton;

web/frontend/src/components/Common/Forms/DataTable.tsx

@@ -0,0 +1,531 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { useEffect, useRef, useState } from "react";
+import {
+  CellComponent,
+  ColumnDefinition,
+  TabulatorFull as Tabulator,
+} from "tabulator-tables";
+import { ValidationError } from "../../../core/Data/validate";
+import Papa from "papaparse";
+import {
+  parseBool,
+  parseNullableNumber,
+  parseNumber,
+} from "../../../core/Operations/commonOps";
+import { UnitCommitmentScenario } from "../../../core/Data/types";
+import { getContingencyTransmissionLines } from "../../../core/Operations/transmissionOps";
+
+export interface ColumnSpec {
+  title: string;
+  type:
+    | "string"
+    | "number"
+    | "number?"
+    | "number[N]"
+    | "number[T]"
+    | "busRef"
+    | "boolean"
+    | "lineContingency";
+  length?: number;
+  width: number;
+}
+
+export const generateTableColumns = (
+  scenario: UnitCommitmentScenario,
+  colSpecs: ColumnSpec[],
+) => {
+  const timeSlots = generateTimeslots(scenario);
+  const columns: ColumnDefinition[] = [];
+  colSpecs.forEach((spec) => {
+    const subColumns: ColumnDefinition[] = [];
+    switch (spec.type) {
+      case "string":
+      case "busRef":
+        columns.push({
+          ...columnsCommonAttrs,
+          title: spec.title,
+          field: spec.title,
+          minWidth: spec.width,
+        });
+        break;
+      case "boolean":
+      case "lineContingency":
+        columns.push({
+          ...columnsCommonAttrs,
+          title: spec.title,
+          field: spec.title,
+          minWidth: spec.width,
+          editor: "list",
+          editorParams: {
+            values: [true, false],
+          },
+        });
+        break;
+      case "number":
+      case "number?":
+        columns.push({
+          ...columnsCommonAttrs,
+          title: spec.title,
+          field: spec.title,
+          minWidth: spec.width,
+          formatter: floatFormatter,
+        });
+        break;
+      case "number[T]":
+        timeSlots.forEach((t) => {
+          subColumns.push({
+            ...columnsCommonAttrs,
+            title: `${t}`,
+            field: `${spec.title} ${t}`,
+            minWidth: spec.width,
+            formatter: floatFormatter,
+          });
+        });
+        columns.push({
+          title: spec.title,
+          columns: subColumns,
+        });
+        break;
+      case "number[N]":
+        for (let i = 1; i <= spec.length!; i++) {
+          subColumns.push({
+            ...columnsCommonAttrs,
+            title: `${i}`,
+            field: `${spec.title} ${i}`,
+            minWidth: spec.width,
+            formatter: floatFormatter,
+          });
+        }
+        columns.push({
+          title: spec.title,
+          columns: subColumns,
+        });
+        break;
+      default:
+        throw Error(`Unknown type: ${spec.type}`);
+    }
+  });
+  return columns;
+};
+
+export const generateTableData = (
+  container: any,
+  colSpecs: ColumnSpec[],
+  scenario: UnitCommitmentScenario,
+): any[] => {
+  const data: any[] = [];
+  const timeslots = generateTimeslots(scenario);
+  let contingencyLines = null;
+  for (const [entryName, entryData] of Object.entries(container) as [
+    string,
+    any,
+  ]) {
+    const entry: any = {};
+    for (const spec of colSpecs) {
+      if (spec.title === "Name") {
+        entry["Name"] = entryName;
+        continue;
+      }
+      switch (spec.type) {
+        case "string":
+        case "number":
+        case "number?":
+        case "boolean":
+        case "busRef":
+          entry[spec.title] = entryData[spec.title];
+          break;
+        case "lineContingency":
+          if (contingencyLines === null) {
+            contingencyLines = getContingencyTransmissionLines(scenario);
+            console.log(contingencyLines);
+          }
+          entry[spec.title] = contingencyLines.has(entryName);
+          break;
+        case "number[T]":
+          for (let i = 0; i < timeslots.length; i++) {
+            entry[`${spec.title} ${timeslots[i]}`] = entryData[spec.title][i];
+          }
+          break;
+        case "number[N]":
+          for (let i = 0; i < spec.length!; i++) {
+            let v = entryData[spec.title][i];
+            if (v === undefined || v === null) v = "";
+            entry[`${spec.title} ${i + 1}`] = v;
+          }
+          break;
+        default:
+          throw Error(`Unknown type: ${spec.type}`);
+      }
+    }
+    data.push(entry);
+  }
+  return data;
+};
+
+export const generateCsv = (data: any[], columns: ColumnDefinition[]) => {
+  const header: string[] = [];
+  const body: string[][] = data.map(() => []);
+  columns.forEach((column) => {
+    if (column.columns) {
+      column.columns.forEach((subcolumn) => {
+        header.push(subcolumn.field!);
+        for (let i = 0; i < data.length; i++) {
+          body[i]!.push(data[i]![subcolumn["field"]!]);
+        }
+      });
+    } else {
+      header.push(column.field!);
+      for (let i = 0; i < data.length; i++) {
+        body[i]!.push(data[i]![column["field"]!]);
+      }
+    }
+  });
+  const csvHeader = header.join(",");
+  const csvBody = body.map((row) => row.join(",")).join("\n");
+  return `${csvHeader}\n${csvBody}`;
+};
+
+export const parseCsv = (
+  csvContents: string,
+  colSpecs: ColumnSpec[],
+  scenario: UnitCommitmentScenario,
+): [any, ValidationError | null] => {
+  // Parse contents
+  const csv = Papa.parse(csvContents, {
+    header: true,
+    skipEmptyLines: true,
+    transformHeader: (header) => header.trim(),
+    transform: (value) => value.trim(),
+  });
+
+  // Check for parsing errors
+  if (csv.errors.length > 0) {
+    console.error(csv.errors);
+    return [null, { message: "Could not parse CSV file" }];
+  }
+
+  // Check CSV headers
+  const columns = generateTableColumns(scenario, colSpecs);
+  const expectedHeader: string[] = [];
+  columns.forEach((column) => {
+    if (column.columns) {
+      column.columns.forEach((subcolumn) => {
+        expectedHeader.push(subcolumn.field!);
+      });
+    } else {
+      expectedHeader.push(column.field!);
+    }
+  });
+  const actualHeader = csv.meta.fields!;
+  for (let i = 0; i < expectedHeader.length; i++) {
+    if (expectedHeader[i] !== actualHeader[i]) {
+      return [
+        null,
+        {
+          message: `Invalid CSV: Header mismatch at column ${i + 1}. 
+          Expected "${expectedHeader[i]}", found "${actualHeader[i]}"`,
+        },
+      ];
+    }
+  }
+
+  // Parse each row
+  const timeslots = generateTimeslots(scenario);
+  const data: { [key: string]: any } = {};
+  for (let i = 0; i < csv.data.length; i++) {
+    const row = csv.data[i] as { [key: string]: any };
+    const rowRef = ` (row ${i + 1})`;
+    const name = row["Name"] as string;
+    if (name in data) {
+      return [null, { message: `Name "${name}" is duplicated` + rowRef }];
+    }
+    data[name] = {};
+
+    for (const spec of colSpecs) {
+      if (spec.title === "Name") continue;
+      switch (spec.type) {
+        case "string":
+          data[name][spec.title] = row[spec.title];
+          break;
+        case "number": {
+          const [val, err] = parseNumber(row[spec.title]);
+          if (err) return [null, { message: err.message + rowRef }];
+          data[name][spec.title] = val;
+          break;
+        }
+        case "number?": {
+          const [val, err] = parseNullableNumber(row[spec.title]);
+          if (err) return [null, { message: err.message + rowRef }];
+          data[name][spec.title] = val;
+          break;
+        }
+        case "busRef":
+          const busName = row[spec.title];
+          if (!(busName in scenario.Buses)) {
+            return [
+              null,
+              { message: `Bus "${busName}" does not exist` + rowRef },
+            ];
+          }
+          data[name][spec.title] = row[spec.title];
+          break;
+        case "number[T]": {
+          data[name][spec.title] = Array(timeslots.length);
+          for (let i = 0; i < timeslots.length; i++) {
+            const [vf, err] = parseNumber(row[`${spec.title} ${timeslots[i]}`]);
+            if (err) return [data, { message: err.message + rowRef }];
+            data[name][spec.title][i] = vf;
+          }
+          break;
+        }
+        case "number[N]": {
+          data[name][spec.title] = Array(spec.length).fill(0);
+          for (let i = 0; i < spec.length!; i++) {
+            let v = row[`${spec.title} ${i + 1}`];
+            if (v.trim() === "") {
+              data[name][spec.title].splice(i, spec.length! - i);
+              break;
+            } else {
+              const [vf, err] = parseNumber(row[`${spec.title} ${i + 1}`]);
+              if (err) return [data, { message: err.message + rowRef }];
+              data[name][spec.title][i] = vf;
+            }
+          }
+          break;
+        }
+        case "boolean":
+        case "lineContingency":
+          const [val, err] = parseBool(row[spec.title]);
+          if (err) return [data, { message: err.message + rowRef }];
+          data[name][spec.title] = val;
+          break;
+        default:
+          throw Error(`Unknown type: ${spec.type}`);
+      }
+    }
+  }
+
+  return [data, null];
+};
+
+export const floatFormatter = (cell: CellComponent) => {
+  const v = cell.getValue();
+  if (v === "" || v === null) {
+    return "&mdash;";
+  } else {
+    return parseFloat(cell.getValue()).toLocaleString("en-US", {
+      minimumFractionDigits: 1,
+      maximumFractionDigits: 1,
+    });
+  }
+};
+
+export const generateTimeslots = (scenario: UnitCommitmentScenario) => {
+  const timeHorizonHours = scenario["Parameters"]["Time horizon (h)"];
+  const timeStepMin = scenario["Parameters"]["Time step (min)"];
+  const timeslots: string[] = [];
+  for (
+    let m = 0, offset = 0;
+    m < timeHorizonHours * 60;
+    m += timeStepMin, offset += 1
+  ) {
+    const hours = Math.floor(m / 60);
+    const mins = m % 60;
+    const formattedTime = `${String(hours).padStart(2, "0")}:${String(mins).padStart(2, "0")}`;
+    timeslots.push(formattedTime);
+  }
+  return timeslots;
+};
+
+export const columnsCommonAttrs: ColumnDefinition = {
+  headerHozAlign: "left",
+  hozAlign: "left",
+  title: "",
+  editor: "input",
+  editorParams: {
+    selectContents: true,
+  },
+  headerWordWrap: true,
+  formatter: "plaintext",
+  headerSort: false,
+  resizable: false,
+};
+
+interface DataTableProps {
+  onRowDeleted: (rowName: string) => ValidationError | null;
+  onRowRenamed: (
+    oldRowName: string,
+    newRowName: string,
+  ) => ValidationError | null;
+  onDataChanged: (
+    rowName: string,
+    key: string,
+    newValue: string,
+  ) => ValidationError | null;
+  generateData: () => [any[], ColumnDefinition[]];
+}
+
+function computeTableHeight(data: any[]): string {
+  const numRows = data.length;
+  const height = 70 + Math.max(Math.min(numRows, 15), 1) * 28;
+  return `${height}px`;
+}
+
+const DataTable = (props: DataTableProps) => {
+  const tableContainerRef = useRef<HTMLDivElement | null>(null);
+  const tableRef = useRef<Tabulator | null>(null);
+  const [isTableBuilt, setTableBuilt] = useState<Boolean>(false);
+  const [activeCell, setActiveCell] = useState<CellComponent | null>(null);
+  const [currentTableData, setCurrentTableData] = useState<any[]>([]);
+
+  useEffect(() => {
+    const onCellEdited = (cell: CellComponent) => {
+      let newValue = `${cell.getValue()}`;
+      let oldValue = `${cell.getOldValue()}`;
+      if (newValue === oldValue) return;
+      if (cell.getField() === "Name") {
+        if (newValue === "") {
+          const err = props.onRowDeleted(oldValue);
+          if (err) {
+            cell.restoreOldValue();
+          } else {
+            cell
+              .getRow()
+              .delete()
+              .then((r) => {});
+          }
+        } else {
+          const err = props.onRowRenamed(oldValue, newValue);
+          if (err) {
+            cell.restoreOldValue();
+          }
+        }
+      } else {
+        const row = cell.getRow().getData();
+        const bus = row["Name"];
+        const err = props.onDataChanged(bus, cell.getField(), newValue);
+        if (err) {
+          cell.restoreOldValue();
+        }
+      }
+    };
+    if (tableContainerRef.current === null) return;
+    const [data, columns] = props.generateData();
+    const height = computeTableHeight(data);
+
+    if (tableRef.current === null) {
+      tableRef.current = new Tabulator(tableContainerRef.current, {
+        layout: "fitColumns",
+        data: data,
+        columns: columns,
+        height: height,
+        index: "Name",
+        placeholder: "No data",
+      });
+      tableRef.current.on("tableBuilt", () => {
+        setTableBuilt(true);
+      });
+    }
+
+    if (isTableBuilt) {
+      const newHeight = height;
+      const newColumns = columns;
+      const newTableData = data;
+      const oldRows = tableRef.current.getRows();
+      const activeRowPosition = activeCell?.getRow().getPosition() as number;
+      const activeField = activeCell?.getField();
+
+      // Update data
+      if (newTableData.length === currentTableData.length) {
+        const updatedRows = newTableData.filter((_, i) => {
+          return (
+            JSON.stringify(newTableData[i]) !==
+            JSON.stringify(currentTableData[i])
+          );
+        });
+        if (updatedRows.length > 0) {
+          tableRef.current
+            .updateData(updatedRows)
+            .then(() => {})
+            .catch((e) => {
+              // WORKAROUND: Updating the same row twice triggers an exception.
+              // In that case, we just update the whole table.
+              console.log(e);
+              tableRef.current!!.replaceData(newTableData).then(() => {});
+            });
+        }
+      } else {
+        tableRef.current.replaceData(newTableData).then(() => {});
+      }
+      setCurrentTableData(newTableData);
+
+      // Restore active cell selection
+      if (activeCell) {
+        tableRef.current
+          ?.getRowFromPosition(activeRowPosition!!)
+          ?.getCell(activeField!!)
+          ?.edit();
+      }
+
+      // Update columns
+      let newColCount = 0;
+      newColumns.forEach((col) => {
+        if (col.columns) newColCount += col.columns.length;
+        else newColCount += 1;
+      });
+      if (newColCount !== tableRef.current.getColumns().length) {
+        tableRef.current.setColumns(newColumns);
+        const rows = tableRef.current!.getRows()!;
+        const firstRow = rows[0];
+        if (firstRow) firstRow.scrollTo().then((r) => {});
+      }
+
+      // Update height
+      if (tableRef.current.options.height !== newHeight) {
+        tableRef.current.setHeight(newHeight);
+      }
+
+      // Scroll to bottom
+      if (tableRef.current.getRows().length === oldRows.length + 1) {
+        setTimeout(() => {
+          const rows = tableRef.current!.getRows()!;
+          const lastRow = rows[rows.length - 1]!;
+          lastRow.scrollTo().then((r) => {});
+          lastRow.getCell("Name").edit();
+        }, 10);
+      }
+
+      // Remove old callbacks
+      tableRef.current.off("cellEdited");
+      tableRef.current.off("cellEditing");
+      tableRef.current.off("cellEditCancelled");
+
+      // Set new callbacks
+      tableRef.current.on("cellEditing", (cell) => {
+        setActiveCell(cell);
+      });
+
+      tableRef.current.on("cellEditCancelled", (cell) => {
+        setActiveCell(null);
+      });
+
+      tableRef.current.on("cellEdited", (cell) => {
+        setActiveCell(null);
+        onCellEdited(cell);
+      });
+    }
+  }, [props, isTableBuilt]);
+
+  return (
+    <div className="tableWrapper">
+      <div ref={tableContainerRef} />
+    </div>
+  );
+};
+
+export default DataTable;

web/frontend/src/components/Common/Forms/Form.module.css

@@ -0,0 +1,46 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.FormWrapper {
+    margin: 0 auto;
+    max-width: var(--site-max-width);
+}
+
+.Form {
+  background-color: var(--contrast-0);
+  border: var(--box-border);
+  border-radius: var(--border-radius);
+  box-shadow: var(--box-shadow);
+  min-height: 48px;
+    margin: 0 12px;
+  min-width: var(--site-min-width);
+  max-height: 500px;
+  padding: 12px;
+}
+
+.FormRow {
+  display: flex;
+  line-height: 24px;
+}
+
+.FormRow label {
+  width: 350px;
+  padding: 6px 12px;
+  text-align: right;
+}
+
+.FormRow input {
+  flex: 1;
+  font-family: monospace;
+  border: var(--box-border);
+  border-radius: var(--border-radius);
+  padding: 4px;
+  margin: 2px 3px;
+}
+
+.FormRow_unit {
+  color: rgba(0, 0, 0, 0.4);
+}

web/frontend/src/components/Common/Forms/Form.tsx

@@ -0,0 +1,18 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { ReactNode } from "react";
+import styles from "./Form.module.css";
+
+function Form({ children }: { children: ReactNode }) {
+  return (
+    <div className={styles.FormWrapper}>
+      <div className={styles.Form}>{children}</div>
+    </div>
+  );
+}
+
+export default Form;

web/frontend/src/components/Common/Forms/Tables.css

@@ -0,0 +1,96 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.tableWrapper {
+  margin: 0 auto;
+  max-width: var(--site-max-width);
+}
+
+.tabulator {
+  background-color: var(--contrast-0);
+  border: var(--box-border) !important;
+  border-radius: var(--border-radius);
+  box-shadow: var(--box-shadow);
+  min-height: 48px;
+  min-width: var(--site-min-width);
+  padding: 0;
+  margin: 0 12px;
+}
+
+.tabulator .tabulator-header {
+  border-bottom: 1px solid #ccc;
+  font-size: 13px;
+  font-weight: bold;
+  color: var(--contrast-100);
+  line-height: 18px;
+}
+
+.tabulator .tabulator-header .subtitle {
+  color: var(--contrast-80);
+  font-weight: normal;
+}
+
+.tabulator .tabulator-header .tabulator-col {
+  border-right: 1px solid rgba(0, 0, 0, 0.1) !important;
+  vertical-align: middle !important;
+}
+
+.tabulator .tabulator-header .tabulator-col .tabulator-col-content {
+  text-align: left;
+  padding: 0 8px;
+  line-height: 24px;
+}
+
+.tabulator .tabulator-header .tabulator-col:last-child {
+  border-right: 1px solid rgba(0, 0, 0, 0.1) !important;
+}
+
+.tabulator-row .tabulator-cell {
+  font-family: monospace;
+  font-size: 12px;
+  line-height: 28px;
+  height: 28px;
+  text-align: right;
+  vertical-align: middle !important;
+  border-right: 1px solid rgba(0, 0, 0, 0.1) !important;
+  border-bottom: 1px solid rgba(0, 0, 0, 0.1) !important;
+  padding: 0 8px;
+}
+
+.tabulator-row-even {
+  background-color: rgba(0, 0, 0, 0.03) !important;
+}
+
+.tabulator-row-odd {
+  background-color: rgba(0, 0, 0, 0) !important;
+}
+
+.tabulator-row .tabulator-cell.tabulator-editing {
+  border: 0;
+  padding: 0 4px;
+  background-color: #cee;
+}
+
+.tabulator-row .tabulator-cell.tabulator-editing input {
+  font-family: monospace;
+  text-align: left;
+  font-size: 12px;
+}
+
+.tabulator-col-group-cols {
+  font-size: 12px;
+}
+
+.tabulator-placeholder {
+    width: 100px !important;
+}
+
+
+.tabulator-placeholder * {
+    font-weight: normal !important;
+    font-size: 14px !important;
+    color: var(--contrast-60) !important;
+}

web/frontend/src/components/Common/Forms/TextInputRow.tsx

@@ -0,0 +1,58 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import formStyles from "./Form.module.css";
+import HelpButton from "../Buttons/HelpButton";
+import React, { useEffect, useRef, useState } from "react";
+import { ValidationError } from "../../../core/Data/validate";
+
+interface TextInputRowProps {
+  label: string;
+  unit: string;
+  tooltip: string;
+  initialValue: string;
+  onChange: (newValue: string) => ValidationError | null;
+}
+
+function TextInputRow(props: TextInputRowProps) {
+  const [savedValue, setSavedValue] = useState(props.initialValue);
+  const inputRef = useRef<HTMLInputElement>(null);
+
+  useEffect(() => {
+    if (inputRef.current) {
+      inputRef.current.value = props.initialValue;
+    }
+    setSavedValue(props.initialValue);
+  }, [props.initialValue]);
+
+  const onBlur = (event: React.FocusEvent<HTMLInputElement>) => {
+    const newValue = event.target.value;
+    if (newValue === savedValue) return;
+    const err = props.onChange(newValue);
+    if (err) {
+      inputRef.current!.value = savedValue;
+      return;
+    }
+  };
+
+  return (
+    <div className={formStyles.FormRow}>
+      <label>
+        {props.label}
+        <span className={formStyles.FormRow_unit}> ({props.unit})</span>
+      </label>
+      <input
+        ref={inputRef}
+        type="text"
+        defaultValue={savedValue}
+        onBlur={onBlur}
+      />
+      <HelpButton text={props.tooltip} />
+    </div>
+  );
+}
+
+export default TextInputRow;

web/frontend/src/components/Common/Forms/Toast.module.css

@@ -0,0 +1,23 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.Toast {
+    width: 600px;
+    border-radius: var(--border-radius);
+    box-shadow: 4px 4px 16px -2px rgba(0, 0, 0, 0.5);
+    margin: 0 auto;
+    background-color: #424242;
+    color: white;
+    padding: 0 16px;
+    position: fixed;
+    top: 48px;
+    left: 50%;
+    transform: translate(-50%, 0);
+    transition: opacity 0.5s ease;
+    cursor: default;
+    font-size: 15px;
+    line-height: 48px;
+}

web/frontend/src/components/Common/Forms/Toast.tsx

@@ -0,0 +1,35 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import styles from "./Toast.module.css";
+import { useEffect, useState } from "react";
+
+interface ToastProps {
+  message: string;
+}
+
+const Toast = (props: ToastProps) => {
+  const [isVisible, setVisible] = useState(true);
+
+  useEffect(() => {
+    if (props.message.length === 0) return;
+    setVisible(true);
+    const timer = setTimeout(() => {
+      setVisible(false);
+    }, 5000);
+    return () => clearTimeout(timer);
+  }, [props.message]);
+
+  return (
+    <div>
+      <div className={styles.Toast} style={{ opacity: isVisible ? 1 : 0 }}>
+        {props.message}
+      </div>
+    </div>
+  );
+};
+
+export default Toast;

web/frontend/src/components/Common/SectionHeader/SectionHeader.module.css

@@ -0,0 +1,25 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+.SectionHeader {
+  max-width: var(--site-max-width);
+  min-width: var(--site-min-width);
+  margin: 0 auto;
+  color: var(--contrast-100);
+}
+
+.SectionHeader h1 {
+  margin: 0;
+  padding: 0 24px;
+  font-size: 16px;
+  line-height: 64px;
+}
+
+.SectionButtonsContainer {
+  float: right;
+  height: 64px;
+  margin-right: 12px;
+}

web/frontend/src/components/Common/SectionHeader/SectionHeader.tsx

@@ -0,0 +1,24 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import styles from "./SectionHeader.module.css";
+import { ReactNode } from "react";
+
+interface SectionHeaderProps {
+  title: string;
+  children?: ReactNode;
+}
+
+function SectionHeader({ title, children }: SectionHeaderProps) {
+  return (
+    <div className={styles.SectionHeader}>
+      <div className={styles.SectionButtonsContainer}>{children}</div>
+      <h1>{title}</h1>
+    </div>
+  );
+}
+
+export default SectionHeader;

web/frontend/src/components/Common/io.ts

@@ -0,0 +1,17 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+export function offerDownload(data: string, type: string, filename: string) {
+  const dataBlob = new Blob([data], { type: type });
+  const url = URL.createObjectURL(dataBlob);
+  const link = document.createElement("a");
+  link.href = url;
+  link.download = filename;
+  document.body.appendChild(link);
+  link.click();
+  document.body.removeChild(link);
+  URL.revokeObjectURL(url);
+}

web/frontend/src/core/Data/fixtures.test.ts

@@ -0,0 +1,132 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { UnitCommitmentScenario } from "./types";
+
+export const TEST_DATA_1: UnitCommitmentScenario = {
+  Parameters: {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 5,
+    "Time step (min)": 60,
+  },
+  Buses: {
+    b1: { "Load (MW)": [35.79534, 34.38835, 33.45083, 32.89729, 33.25044] },
+    b2: { "Load (MW)": [14.03739, 13.48563, 13.11797, 12.9009, 13.03939] },
+    b3: { "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 25.4268] },
+  },
+  Generators: {
+    g1: {
+      Bus: "b1",
+      Type: "Thermal",
+      "Production cost curve (MW)": [100.0, 110.0, 130.0, 135.0],
+      "Production cost curve ($)": [1400.0, 1600.0, 2200.0, 2400.0],
+      "Startup costs ($)": [300.0, 400.0],
+      "Startup delays (h)": [1, 4],
+      "Ramp up limit (MW)": 232.68,
+      "Ramp down limit (MW)": 232.68,
+      "Startup limit (MW)": 232.68,
+      "Shutdown limit (MW)": 232.68,
+      "Minimum downtime (h)": 4,
+      "Minimum uptime (h)": 4,
+      "Initial status (h)": 12,
+      "Initial power (MW)": 115,
+      "Must run?": false,
+    },
+    pu1: {
+      Bus: "b1",
+      Type: "Profiled",
+      "Cost ($/MW)": 12.5,
+      "Maximum power (MW)": [10, 12, 13, 15, 20],
+      "Minimum power (MW)": [0, 0, 0, 0, 0],
+    },
+    pu2: {
+      Bus: "b1",
+      Type: "Profiled",
+      "Cost ($/MW)": 120,
+      "Maximum power (MW)": [50, 50, 50, 50, 50],
+      "Minimum power (MW)": [0, 0, 0, 0, 0],
+    },
+  },
+  "Transmission lines": {
+    l1: {
+      "Source bus": "b1",
+      "Target bus": "b2",
+      "Susceptance (S)": 29.49686,
+      "Normal flow limit (MW)": 15000.0,
+      "Emergency flow limit (MW)": 20000.0,
+      "Flow limit penalty ($/MW)": 5000.0,
+    },
+  },
+  "Storage units": {
+    su1: {
+      Bus: "b1",
+      "Minimum level (MWh)": 10.0,
+      "Maximum level (MWh)": 100.0,
+      "Charge cost ($/MW)": 2.0,
+      "Discharge cost ($/MW)": 1.0,
+      "Charge efficiency": 0.8,
+      "Discharge efficiency": 0.85,
+      "Loss factor": 0.01,
+      "Minimum charge rate (MW)": 5.0,
+      "Maximum charge rate (MW)": 10.0,
+      "Minimum discharge rate (MW)": 4.0,
+      "Maximum discharge rate (MW)": 8.0,
+      "Initial level (MWh)": 20.0,
+      "Last period minimum level (MWh)": 21.0,
+      "Last period maximum level (MWh)": 22.0,
+    },
+  },
+  "Price-sensitive loads": {
+    ps1: {
+      Bus: "b3",
+      "Revenue ($/MW)": 23.0,
+      "Demand (MW)": [50, 50, 50, 50, 50],
+    },
+  },
+  Contingencies: {
+    l1: {
+      "Affected generators": [],
+      "Affected lines": ["l1"],
+    },
+  },
+};
+
+export const TEST_DATA_2: UnitCommitmentScenario = {
+  Parameters: {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 2,
+    "Time step (min)": 30,
+  },
+  Buses: {
+    b1: { "Load (MW)": [30, 30, 30, 30] },
+    b2: { "Load (MW)": [10, 20, 30, 40] },
+    b3: { "Load (MW)": [0, 30, 0, 40] },
+  },
+  Contingencies: {},
+  Generators: {},
+  "Transmission lines": {},
+  "Storage units": {},
+  "Price-sensitive loads": {},
+};
+
+export const TEST_DATA_BLANK: UnitCommitmentScenario = {
+  Parameters: {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 5,
+    "Time step (min)": 60,
+  },
+  Buses: {},
+  Contingencies: {},
+  Generators: {},
+  "Transmission lines": {},
+  "Storage units": {},
+  "Price-sensitive loads": {},
+};
+
+test("fixtures", () => {});

web/frontend/src/core/Data/fixtures.tsx

@@ -0,0 +1,26 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { UnitCommitmentScenario } from "./types";
+
+export interface Buses {
+  [busName: string]: { "Load (MW)": number[] };
+}
+
+export const BLANK_SCENARIO: UnitCommitmentScenario = {
+  Parameters: {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 24,
+    "Time step (min)": 60,
+  },
+  Buses: {},
+  Generators: {},
+  "Transmission lines": {},
+  "Storage units": {},
+  "Price-sensitive loads": {},
+  Contingencies: {},
+};

web/frontend/src/core/Data/migrate.test.ts

@@ -0,0 +1,34 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import assert from "node:assert";
+import fs from "node:fs";
+import pako from "pako";
+import { migrateToV03, migrateToV04 } from "./migrate";
+
+function readJsonGz(filename: string) {
+  const compressedData = fs.readFileSync(filename);
+  const decompressedData = pako.inflate(compressedData, { to: "string" });
+  return JSON.parse(decompressedData);
+}
+
+test("migrateToV03", () => {
+  const jsonData = readJsonGz("../test/fixtures/ucjl-0.2.json.gz");
+  migrateToV03(jsonData);
+  assert.deepEqual(jsonData.Reserves, {
+    r1: {
+      "Amount (MW)": 100,
+      "Shortfall penalty ($/MW)": 1000,
+      Type: "spinning",
+    },
+  });
+});
+
+test("migrateToV04", () => {
+  const jsonData = readJsonGz("../test/fixtures/ucjl-0.3.json.gz");
+  migrateToV04(jsonData);
+  assert.equal(jsonData.Generators["g1"].Type, "Thermal");
+});

web/frontend/src/core/Data/migrate.ts

@@ -0,0 +1,56 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { ValidationError } from "./validate";
+
+export const migrate = (json: any): ValidationError | null => {
+  const version = json.Parameters?.Version;
+  if (!version) {
+    return {
+      message:
+        "The provided input file cannot be loaded because it does not " +
+        "specify what version of UnitCommitment.jl it was written for.",
+    };
+  }
+  if (!["0.2", "0.3", "0.4"].includes(version)) {
+    return { message: `Unsupported file version: ${version}` };
+  }
+  if (version < "0.3") migrateToV03(json);
+  if (version < "0.4") migrateToV04(json);
+  json.Parameters.Version = "0.4";
+  return null;
+};
+
+export const migrateToV03 = (json: any): void => {
+  if (json.Reserves && json.Reserves["Spinning (MW)"] != null) {
+    const amount = json.Reserves["Spinning (MW)"];
+    json.Reserves = {
+      r1: {
+        Type: "spinning",
+        "Amount (MW)": amount,
+      },
+    };
+    if (json.Generators) {
+      for (const genName in json.Generators) {
+        const gen = json.Generators[genName];
+        if (gen["Provides spinning reserves?"] === true) {
+          gen["Reserve eligibility"] = ["r1"];
+        }
+      }
+    }
+  }
+};
+
+export const migrateToV04 = (json: any): void => {
+  if (json.Generators) {
+    for (const genName in json.Generators) {
+      const gen = json.Generators[genName];
+      if (gen.Type == null) {
+        gen.Type = "Thermal";
+      }
+    }
+  }
+};

web/frontend/src/core/Data/schema.ts

@@ -0,0 +1,373 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+export const schema = {
+  $schema: "http://json-schema.org/draft-07/schema#",
+  title: "Schema for Unit Commitment Input File",
+  definitions: {
+    Parameters: {
+      type: "object",
+      properties: {
+        Version: {
+          type: "string",
+          const: "0.4",
+          description: "Version of UnitCommitment.jl",
+        },
+        "Time horizon (min)": {
+          type: "number",
+          exclusiveMinimum: 0,
+          description: "Length of the planning horizon in minutes",
+        },
+        "Time horizon (h)": {
+          type: "number",
+          exclusiveMinimum: 0,
+          description: "Length of the planning horizon in hours",
+        },
+        "Time step (min)": {
+          type: "number",
+          default: 60,
+          enum: [60, 30, 20, 15, 12, 10, 6, 5, 4, 3, 2, 1],
+          description: "Must be a divisor of 60",
+        },
+        "Power balance penalty ($/MW)": {
+          type: "number",
+          default: 1000.0,
+          minimum: 0,
+          description: "Penalty for system-wide shortage or surplus",
+        },
+        "Scenario name": {
+          type: "string",
+          default: "s1",
+          description: "Name of the scenario",
+        },
+        "Scenario weight": {
+          type: "number",
+          default: 1.0,
+          exclusiveMinimum: 0,
+          description: "Weight of the scenario",
+        },
+      },
+      required: ["Time step (min)", "Power balance penalty ($/MW)"],
+      oneOf: [
+        { required: ["Time horizon (min)"] },
+        { required: ["Time horizon (h)"] },
+      ],
+      not: {
+        required: ["Time horizon (min)", "Time horizon (h)"],
+      },
+    },
+    Bus: {
+      type: "object",
+      additionalProperties: {
+        type: "object",
+        properties: {
+          "Load (MW)": {
+            oneOf: [
+              { type: "null" },
+              { type: "number" },
+              {
+                type: "array",
+                items: {
+                  oneOf: [{ type: "number" }, { type: "null" }],
+                },
+              },
+            ],
+          },
+        },
+      },
+    },
+    TransmissionLines: {
+      type: "object",
+      additionalProperties: {
+        type: "object",
+        properties: {
+          "Source bus": {
+            type: "string",
+            minLength: 1,
+          },
+          "Target bus": {
+            type: "string",
+            minLength: 1,
+            not: {
+              const: { $data: "1/Source bus" },
+            },
+          },
+          "Susceptance (S)": {
+            type: "number",
+          },
+          "Normal flow limit (MW)": {
+            type: "number",
+            minimum: 0,
+            nullable: true,
+            default: null,
+          },
+          "Emergency flow limit (MW)": {
+            type: "number",
+            minimum: 0,
+            nullable: true,
+            default: null,
+          },
+          "Flow limit penalty ($/MW)": {
+            type: "number",
+            minimum: 0,
+            default: 5000.0,
+          },
+        },
+        required: ["Source bus", "Target bus", "Susceptance (S)"],
+      },
+    },
+    StorageUnits: {
+      type: "object",
+      additionalProperties: {
+        type: "object",
+        properties: {
+          Bus: {
+            type: "string",
+            minLength: 1,
+          },
+          "Minimum level (MWh)": {
+            type: "number",
+          },
+          "Maximum level (MWh)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Allow simultaneous charging and discharging": {
+            type: "boolean",
+            default: true,
+          },
+          "Charge cost ($/MW)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Discharge cost ($/MW)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Charge efficiency": {
+            type: "number",
+            minimum: 0,
+            maximum: 1,
+          },
+          "Discharge efficiency": {
+            type: "number",
+            minimum: 0,
+            maximum: 1,
+          },
+          "Loss factor": {
+            type: "number",
+            minimum: 0,
+          },
+          "Minimum charge rate (MW)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Maximum charge rate (MW)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Minimum discharge rate (MW)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Maximum discharge rate (MW)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Initial level (MWh)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Last period minimum level (MWh)": {
+            type: "number",
+            minimum: 0,
+          },
+          "Last period maximum level (MWh)": {
+            type: "number",
+            minimum: 0,
+          },
+        },
+        required: ["Bus"],
+      },
+    },
+    Generators: {
+      type: "object",
+      additionalProperties: {
+        type: "object",
+        if: {
+          properties: {
+            Type: { const: "Thermal" },
+          },
+        },
+        then: {
+          properties: {
+            Bus: {
+              type: "string",
+              minLength: 1,
+            },
+            Type: {
+              type: "string",
+              const: "Thermal",
+            },
+            "Production cost curve (MW)": {
+              type: "array",
+              items: {
+                type: "number",
+                minimum: 0,
+              },
+              minItems: 1,
+            },
+            "Production cost curve ($)": {
+              type: "array",
+              items: {
+                type: "number",
+                minimum: 0,
+              },
+              minItems: 1,
+            },
+            "Startup costs ($)": {
+              type: "array",
+              items: {
+                type: "number",
+                minimum: 0,
+              },
+              default: [0.0],
+            },
+            "Startup delays (h)": {
+              type: "array",
+              items: {
+                type: "integer",
+                minimum: 1,
+              },
+              default: [1],
+            },
+            "Minimum uptime (h)": {
+              type: "integer",
+              default: 1,
+              minimum: 0,
+            },
+            "Minimum downtime (h)": {
+              type: "integer",
+              default: 1,
+              minimum: 0,
+            },
+            "Ramp up limit (MW)": {
+              type: "number",
+              minimum: 0,
+              nullable: true,
+              default: null,
+            },
+            "Ramp down limit (MW)": {
+              type: "number",
+              minimum: 0,
+              nullable: true,
+              default: null,
+            },
+            "Startup limit (MW)": {
+              type: "number",
+              minimum: 0,
+              nullable: true,
+              default: null,
+            },
+            "Shutdown limit (MW)": {
+              type: "number",
+              minimum: 0,
+              nullable: true,
+              default: null,
+            },
+            "Initial status (h)": {
+              type: "integer",
+              default: 1,
+              not: { const: 0 },
+            },
+            "Initial power (MW)": {
+              type: "number",
+              minimum: 0,
+            },
+            "Must run?": {
+              type: "boolean",
+              default: false,
+            },
+          },
+          required: [
+            "Bus",
+            "Type",
+            "Production cost curve (MW)",
+            "Production cost curve ($)",
+            "Initial status (h)",
+            "Initial power (MW)",
+          ],
+        },
+        else: {
+          properties: {
+            Type: { const: "Profiled" },
+            Bus: {
+              type: "string",
+              minLength: 1,
+            },
+            "Maximum power (MW)": {
+              oneOf: [
+                {
+                  type: "number",
+                },
+                {
+                  type: "array",
+                  items: {
+                    type: "number",
+                  },
+                },
+              ],
+            },
+            "Cost ($/MW)": {
+              type: "number",
+              minimum: 0,
+            },
+          },
+          required: ["Type", "Bus", "Maximum power (MW)", "Cost ($/MW)"],
+        },
+      },
+    },
+    Contingencies: {
+      type: "object",
+      additionalProperties: {
+        type: "object",
+        properties: {
+          "Affected lines": {
+            type: "array",
+            items: {
+              type: "string",
+            },
+            maxItems: 1,
+            minItems: 1,
+          },
+        },
+        required: ["Affected lines"],
+      },
+    },
+  },
+  type: "object",
+  properties: {
+    Parameters: {
+      $ref: "#/definitions/Parameters",
+    },
+    Buses: {
+      $ref: "#/definitions/Bus",
+    },
+    "Transmission lines": {
+      $ref: "#/definitions/TransmissionLines",
+    },
+    "Storage units": {
+      $ref: "#/definitions/StorageUnits",
+    },
+    Generators: {
+      $ref: "#/definitions/Generators",
+    },
+    Contingencies: {
+      $ref: "#/definitions/Contingencies",
+    },
+  },
+  required: ["Parameters"],
+};

web/frontend/src/core/Data/types.tsx

@@ -0,0 +1,119 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { Buses } from "./fixtures";
+
+export interface Generators {
+  [name: string]: ProfiledUnit | ThermalUnit;
+}
+
+export interface ProfiledUnit {
+  Bus: string;
+  Type: "Profiled";
+  "Minimum power (MW)": number[];
+  "Maximum power (MW)": number[];
+  "Cost ($/MW)": number;
+}
+
+export interface ThermalUnit {
+  Bus: string;
+  Type: "Thermal";
+  "Production cost curve (MW)": number[];
+  "Production cost curve ($)": number[];
+  "Startup costs ($)": number[];
+  "Startup delays (h)": number[];
+  "Ramp up limit (MW)": number | null;
+  "Ramp down limit (MW)": number | null;
+  "Startup limit (MW)": number | null;
+  "Shutdown limit (MW)": number | null;
+  "Minimum downtime (h)": number;
+  "Minimum uptime (h)": number;
+  "Initial status (h)": number;
+  "Initial power (MW)": number;
+  "Must run?": boolean;
+}
+
+export interface TransmissionLine {
+  "Source bus": string;
+  "Target bus": string;
+  "Susceptance (S)": number;
+  "Normal flow limit (MW)": number | null;
+  "Emergency flow limit (MW)": number | null;
+  "Flow limit penalty ($/MW)": number;
+}
+
+export interface StorageUnit {
+  Bus: string;
+  "Minimum level (MWh)": number;
+  "Maximum level (MWh)": number;
+  "Charge cost ($/MW)": number;
+  "Discharge cost ($/MW)": number;
+  "Charge efficiency": number;
+  "Discharge efficiency": number;
+  "Loss factor": number;
+  "Minimum charge rate (MW)": number;
+  "Maximum charge rate (MW)": number;
+  "Minimum discharge rate (MW)": number;
+  "Maximum discharge rate (MW)": number;
+  "Initial level (MWh)": number;
+  "Last period minimum level (MWh)": number;
+  "Last period maximum level (MWh)": number;
+}
+
+export interface PriceSensitiveLoad {
+  Bus: string;
+  "Revenue ($/MW)": number;
+  "Demand (MW)": number[];
+}
+
+export interface Contingency {
+  "Affected lines": string[];
+  "Affected generators": string[];
+}
+
+export interface UnitCommitmentScenario {
+  Parameters: {
+    Version: string;
+    "Power balance penalty ($/MW)": number;
+    "Time horizon (h)": number;
+    "Time step (min)": number;
+  };
+  Buses: Buses;
+  Generators: Generators;
+  "Transmission lines": {
+    [name: string]: TransmissionLine;
+  };
+  "Storage units": {
+    [name: string]: StorageUnit;
+  };
+  "Price-sensitive loads": {
+    [name: string]: PriceSensitiveLoad;
+  };
+  Contingencies: {
+    [name: string]: Contingency;
+  };
+}
+
+const getTypedGenerators = <T extends any>(
+  scenario: UnitCommitmentScenario,
+  type: string,
+): {
+  [key: string]: T;
+} => {
+  const selected: { [key: string]: T } = {};
+  for (const [name, gen] of Object.entries(scenario.Generators)) {
+    if (gen["Type"] === type) selected[name] = gen as T;
+  }
+  return selected;
+};
+export const getProfiledGenerators = (
+  scenario: UnitCommitmentScenario,
+): { [key: string]: ProfiledUnit } =>
+  getTypedGenerators<ProfiledUnit>(scenario, "Profiled");
+export const getThermalGenerators = (
+  scenario: UnitCommitmentScenario,
+): { [key: string]: ThermalUnit } =>
+  getTypedGenerators<ThermalUnit>(scenario, "Thermal");

web/frontend/src/core/Data/validate.ts

@@ -0,0 +1,22 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { schema } from "./schema";
+import Ajv from "ajv";
+
+// Create Ajv instance with detailed debug options
+const ajv = new Ajv({
+  useDefaults: true,
+  verbose: true,
+  allErrors: true,
+  $data: true,
+});
+
+export interface ValidationError {
+  message: string;
+}
+
+export const validate = ajv.compile(schema);

web/frontend/src/core/Operations/busOps.test.ts

@@ -0,0 +1,71 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { changeBusData, createBus, deleteBus, renameBus } from "./busOps";
+import assert from "node:assert";
+import { TEST_DATA_1 } from "../Data/fixtures.test";
+
+test("createBus", () => {
+  const newScenario = createBus(TEST_DATA_1);
+  assert.deepEqual(Object.keys(newScenario.Buses), ["b1", "b2", "b3", "b4"]);
+});
+
+test("changeBusData", () => {
+  let scenario = TEST_DATA_1;
+  let err = null;
+
+  [scenario, err] = changeBusData("b1", "Load (MW) 00:00", "99", scenario);
+  assert.equal(err, null);
+  [scenario, err] = changeBusData("b1", "Load (MW) 03:00", "99", scenario);
+  assert.equal(err, null);
+
+  [scenario, err] = changeBusData("b3", "Load (MW) 04:00", "99", scenario);
+  assert.equal(err, null);
+
+  assert.deepEqual(scenario.Buses, {
+    b1: { "Load (MW)": [99, 34.38835, 33.45083, 99, 33.25044] },
+    b2: { "Load (MW)": [14.03739, 13.48563, 13.11797, 12.9009, 13.03939] },
+    b3: { "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 99] },
+  });
+});
+
+test("changeBusData with invalid numbers", () => {
+  let [, err] = changeBusData("b1", "Load (MW) 00:00", "xx", TEST_DATA_1);
+  assert(err !== null);
+  assert.equal(err.message, '"xx" is not a valid number');
+});
+
+test("deleteBus", () => {
+  let scenario = TEST_DATA_1;
+  scenario = deleteBus("b2", scenario);
+  assert.deepEqual(scenario.Buses, {
+    b1: { "Load (MW)": [35.79534, 34.38835, 33.45083, 32.89729, 33.25044] },
+    b3: { "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 25.4268] },
+  });
+});
+
+test("renameBus", () => {
+  let [scenario, err] = renameBus("b1", "b99", TEST_DATA_1);
+  assert(err === null);
+  assert.deepEqual(scenario.Buses, {
+    b99: { "Load (MW)": [35.79534, 34.38835, 33.45083, 32.89729, 33.25044] },
+    b2: { "Load (MW)": [14.03739, 13.48563, 13.11797, 12.9009, 13.03939] },
+    b3: { "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 25.4268] },
+  });
+  assert.deepEqual(scenario.Generators["pu1"], {
+    Bus: "b99",
+    Type: "Profiled",
+    "Cost ($/MW)": 12.5,
+    "Maximum power (MW)": [10, 12, 13, 15, 20],
+    "Minimum power (MW)": [0, 0, 0, 0, 0],
+  });
+});
+
+test("renameBus with duplicated name", () => {
+  let [, err] = renameBus("b3", "b1", TEST_DATA_1);
+  assert(err != null);
+  assert.equal(err.message, `b1 already exists`);
+});

web/frontend/src/core/Operations/busOps.ts

@@ -0,0 +1,87 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { Buses } from "../Data/fixtures";
+import { ValidationError } from "../Data/validate";
+import { generateTimeslots } from "../../components/Common/Forms/DataTable";
+import {
+  changeData,
+  generateUniqueName,
+  renameItemInObject,
+} from "./commonOps";
+import { BusesColumnSpec } from "../../components/CaseBuilder/Buses";
+import { UnitCommitmentScenario } from "../Data/types";
+
+export const createBus = (scenario: UnitCommitmentScenario) => {
+  const name = generateUniqueName(scenario.Buses, "b");
+  const timeslots = generateTimeslots(scenario);
+  return {
+    ...scenario,
+    Buses: {
+      ...scenario.Buses,
+      [name]: {
+        "Load (MW)": Array(timeslots.length).fill(0),
+      },
+    },
+  };
+};
+
+export const changeBusData = (
+  bus: string,
+  field: string,
+  newValueStr: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newBus, err] = changeData(
+    field,
+    newValueStr,
+    scenario.Buses[bus]!,
+    BusesColumnSpec,
+    scenario,
+  );
+  if (err) return [scenario, err];
+  return [
+    {
+      ...scenario,
+      Buses: {
+        ...scenario.Buses,
+        [bus]: newBus,
+      } as Buses,
+    },
+    null,
+  ];
+};
+
+export const deleteBus = (bus: string, scenario: UnitCommitmentScenario) => {
+  const { [bus]: _, ...newBuses } = scenario.Buses;
+  const newGenerators = { ...scenario.Generators };
+
+  // Update generators
+  for (const genName in scenario.Generators) {
+    let gen = scenario.Generators[genName]!;
+    if (gen["Bus"] === bus) delete newGenerators[genName];
+  }
+  return { ...scenario, Buses: newBuses, Generators: newGenerators };
+};
+
+export const renameBus = (
+  oldName: string,
+  newName: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newBuses, err] = renameItemInObject(oldName, newName, scenario.Buses);
+  if (err) return [scenario, err];
+
+  // Update generators
+  const newGenerators = { ...scenario.Generators };
+  for (const genName in scenario.Generators) {
+    let gen = newGenerators[genName]!;
+    if (gen["Bus"] === oldName) {
+      newGenerators[genName] = { ...gen, Bus: newName };
+    }
+  }
+  return [{ ...scenario, Buses: newBuses, Generators: newGenerators }, null];
+};

web/frontend/src/core/Operations/commonOps.test.ts

@@ -0,0 +1,30 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { parseBool } from "./commonOps";
+import assert from "node:assert";
+
+test("parseBool", () => {
+  // True values
+  for (const str of ["true", "TRUE", "1"]) {
+    let [v, err] = parseBool(str);
+    assert(!err);
+    assert.equal(v, true);
+  }
+
+  // False values
+  for (const str of ["false", "FALSE", "0"]) {
+    let [v, err] = parseBool(str);
+    assert(!err);
+    assert.equal(v, false);
+  }
+
+  // Invalid values
+  for (const str of ["qwe", ""]) {
+    let [, err] = parseBool(str);
+    assert(err);
+  }
+});

web/frontend/src/core/Operations/commonOps.ts

@@ -0,0 +1,258 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { ValidationError } from "../Data/validate";
+import { ColumnSpec } from "../../components/Common/Forms/DataTable";
+import { UnitCommitmentScenario } from "../Data/types";
+
+export const renameItemInObject = <T>(
+  oldName: string,
+  newName: string,
+  container: { [key: string]: T },
+): [{ [key: string]: T }, ValidationError | null] => {
+  if (newName in container) {
+    return [container, { message: `${newName} already exists` }];
+  }
+  const newContainer = Object.keys(container).reduce(
+    (acc, val) => {
+      if (val === oldName) {
+        acc[newName] = container[val]!;
+      } else {
+        acc[val] = container[val]!;
+      }
+      return acc;
+    },
+    {} as { [key: string]: T },
+  );
+  return [newContainer, null];
+};
+
+export const generateUniqueName = (container: any, prefix: string): string => {
+  let counter = 1;
+  let name = `${prefix}${counter}`;
+  while (name in container) {
+    counter++;
+    name = `${prefix}${counter}`;
+  }
+  return name;
+};
+
+export const parseNumber = (
+  valueStr: string,
+): [number, ValidationError | null] => {
+  if (valueStr === "") {
+    return [0, { message: "Field must not be blank" }];
+  }
+  const valueFloat = parseFloat(valueStr);
+  if (isNaN(valueFloat)) {
+    return [0, { message: `"${valueStr}" is not a valid number` }];
+  } else {
+    return [valueFloat, null];
+  }
+};
+
+export const parseNullableNumber = (
+  valueStr: string,
+): [number | null, ValidationError | null] => {
+  if (valueStr === "") return [null, null];
+  return parseNumber(valueStr);
+};
+
+export const parseBool = (
+  valueStr: string,
+): [boolean, ValidationError | null] => {
+  if (["true", "1"].includes(valueStr.toLowerCase())) {
+    return [true, null];
+  }
+  if (["false", "0"].includes(valueStr.toLowerCase())) {
+    return [false, null];
+  }
+  return [true, { message: `"${valueStr}" is not a valid boolean value` }];
+};
+
+export const changeStringData = (
+  field: string,
+  newValue: string,
+  container: { [key: string]: any },
+): [{ [key: string]: any }, ValidationError | null] => {
+  return [
+    {
+      ...container,
+      [field]: newValue,
+    },
+    null,
+  ];
+};
+
+export const changeBusRefData = (
+  field: string,
+  newValue: string,
+  container: { [key: string]: any },
+  scenario: UnitCommitmentScenario,
+): [{ [key: string]: any }, ValidationError | null] => {
+  if (!(newValue in scenario.Buses)) {
+    return [scenario, { message: `Bus "${newValue}" does not exist` }];
+  }
+  return changeStringData(field, newValue, container);
+};
+
+export const changeNumberData = (
+  field: string,
+  newValueStr: string,
+  container: { [key: string]: any },
+  nullable: boolean = false,
+): [{ [key: string]: any }, ValidationError | null] => {
+  // Parse value
+  const [newValueFloat, err] = nullable
+    ? parseNullableNumber(newValueStr)
+    : parseNumber(newValueStr);
+  if (err) return [container, err];
+
+  // Build the new object
+  return [
+    {
+      ...container,
+      [field]: newValueFloat,
+    },
+    null,
+  ];
+};
+
+export const changeBooleanData = (
+  field: string,
+  newValueStr: string,
+  container: { [key: string]: any },
+): [{ [key: string]: any }, ValidationError | null] => {
+  // Parse value
+  const [newValueBool, err] = parseBool(newValueStr);
+  if (err) return [container, err];
+
+  // Build the new object
+  return [
+    {
+      ...container,
+      [field]: newValueBool,
+    },
+    null,
+  ];
+};
+
+export const changeNumberVecTData = (
+  field: string,
+  time: string,
+  newValueStr: string,
+  container: { [key: string]: any },
+  scenario: UnitCommitmentScenario,
+): [{ [key: string]: any }, ValidationError | null] => {
+  // Parse value
+  const [newValueFloat, err] = parseNumber(newValueStr);
+  if (err) return [container, err];
+
+  // Convert HH:MM to offset
+  const hours = parseInt(time.split(":")[0]!, 10);
+  const min = parseInt(time.split(":")[1]!, 10);
+  const idx = (hours * 60 + min) / scenario.Parameters["Time step (min)"];
+
+  // Build the new vector
+  const newVec = [...container[field]];
+  newVec[idx] = newValueFloat;
+  return [
+    {
+      ...container,
+      [field]: newVec,
+    },
+    null,
+  ];
+};
+
+export const changeNumberVecNData = (
+  field: string,
+  offset: string,
+  newValueStr: string,
+  container: { [key: string]: any },
+): [{ [key: string]: any }, ValidationError | null] => {
+  const oldVec = container[field];
+  const newVec = [...container[field]];
+  const idx = parseInt(offset) - 1;
+
+  if (newValueStr === "") {
+    // Trim the vector
+    newVec.splice(idx, oldVec.length - idx);
+  } else {
+    // Parse new value
+    const [newValueFloat, err] = parseNumber(newValueStr);
+    if (err) return [container, err];
+
+    // Increase the length of the vector
+    if (idx >= oldVec.length) {
+      for (let i = oldVec.length; i < idx; i++) {
+        newVec[i] = 0;
+      }
+    }
+
+    // Assign new value
+    newVec[idx] = newValueFloat;
+  }
+  return [
+    {
+      ...container,
+      [field]: newVec,
+    },
+    null,
+  ];
+};
+
+export const changeData = (
+  field: string,
+  newValueStr: string,
+  container: { [key: string]: any },
+  colSpecs: ColumnSpec[],
+  scenario: UnitCommitmentScenario,
+): [{ [key: string]: any }, ValidationError | null] => {
+  const match = field.match(/^([^0-9]+)([0-9:]+)?$/);
+  const fieldName = match![1]!.trim();
+  const fieldOffset = match![2];
+  for (const spec of colSpecs) {
+    if (spec.title !== fieldName) continue;
+    switch (spec.type) {
+      case "string":
+        return changeStringData(fieldName, newValueStr, container);
+      case "busRef":
+        return changeBusRefData(fieldName, newValueStr, container, scenario);
+      case "number":
+        return changeNumberData(fieldName, newValueStr, container);
+      case "number?":
+        return changeNumberData(fieldName, newValueStr, container, true);
+      case "number[T]":
+        return changeNumberVecTData(
+          fieldName,
+          fieldOffset!,
+          newValueStr,
+          container,
+          scenario,
+        );
+      case "number[N]":
+        return changeNumberVecNData(
+          fieldName,
+          fieldOffset!,
+          newValueStr,
+          container,
+        );
+      case "boolean":
+        return changeBooleanData(fieldName, newValueStr, container);
+      default:
+        throw Error(`Unknown type: ${spec.type}`);
+    }
+  }
+  throw Error(`Unknown field: ${fieldName}`);
+};
+export const assertBusesNotEmpty = (
+  scenario: UnitCommitmentScenario,
+): ValidationError | null => {
+  if (Object.keys(scenario.Buses).length === 0)
+    return { message: "This component requires an existing bus." };
+  return null;
+};

web/frontend/src/core/Operations/generatorOps.test.ts

@@ -0,0 +1,151 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { TEST_DATA_1, TEST_DATA_BLANK } from "../Data/fixtures.test";
+import assert from "node:assert";
+import {
+  changeProfiledUnitData,
+  changeThermalUnitData,
+  createProfiledUnit,
+  createThermalUnit,
+  deleteGenerator,
+  renameGenerator,
+} from "./generatorOps";
+import { ValidationError } from "../Data/validate";
+
+test("createProfiledUnit", () => {
+  const [newScenario, err] = createProfiledUnit(TEST_DATA_1);
+  assert(err === null);
+  assert.equal(Object.keys(newScenario.Generators).length, 4);
+  assert("pu3" in newScenario.Generators);
+});
+
+test("createThermalUnit", () => {
+  const [newScenario, err] = createThermalUnit(TEST_DATA_1);
+  assert(err === null);
+  assert.equal(Object.keys(newScenario.Generators).length, 4);
+  assert("g2" in newScenario.Generators);
+});
+
+test("createProfiledUnit with blank file", () => {
+  const [, err] = createProfiledUnit(TEST_DATA_BLANK);
+  assert(err !== null);
+  assert.equal(err.message, "This component requires an existing bus.");
+});
+
+test("changeProfiledUnitData", () => {
+  let scenario = TEST_DATA_1;
+  let err: ValidationError | null;
+  [scenario, err] = changeProfiledUnitData(
+    "pu1",
+    "Cost ($/MW)",
+    "99",
+    scenario,
+  );
+  assert.equal(err, null);
+  [scenario, err] = changeProfiledUnitData(
+    "pu1",
+    "Maximum power (MW) 03:00",
+    "99",
+    scenario,
+  );
+  assert.equal(err, null);
+  [scenario, err] = changeProfiledUnitData("pu2", "Bus", "b3", scenario);
+  assert.equal(err, null);
+  assert.deepEqual(scenario.Generators["pu2"], {
+    Bus: "b3",
+    Type: "Profiled",
+    "Cost ($/MW)": 120,
+    "Maximum power (MW)": [50, 50, 50, 50, 50],
+    "Minimum power (MW)": [0, 0, 0, 0, 0],
+  });
+});
+
+test("changeThermalUnitData", () => {
+  let scenario = TEST_DATA_1;
+  let err: ValidationError | null;
+  [scenario, err] = changeThermalUnitData(
+    "g1",
+    "Ramp up limit (MW)",
+    "99",
+    scenario,
+  );
+  assert(!err);
+  [scenario, err] = changeThermalUnitData(
+    "g1",
+    "Startup costs ($) 2",
+    "99",
+    scenario,
+  );
+  assert(!err);
+  [scenario, err] = changeThermalUnitData(
+    "g1",
+    "Production cost curve ($) 7",
+    "99",
+    scenario,
+  );
+  assert(!err);
+  [scenario, err] = changeThermalUnitData(
+    "g1",
+    "Production cost curve (MW) 3",
+    "",
+    scenario,
+  );
+  assert(!err);
+  [scenario, err] = changeThermalUnitData("g1", "Must run?", "true", scenario);
+  assert(!err);
+  assert.deepEqual(scenario.Generators["g1"], {
+    Bus: "b1",
+    Type: "Thermal",
+    "Production cost curve (MW)": [100.0, 110],
+    "Production cost curve ($)": [1400.0, 1600.0, 2200.0, 2400.0, 0, 0, 99],
+    "Startup costs ($)": [300.0, 99.0],
+    "Startup delays (h)": [1, 4],
+    "Ramp up limit (MW)": 99,
+    "Ramp down limit (MW)": 232.68,
+    "Startup limit (MW)": 232.68,
+    "Shutdown limit (MW)": 232.68,
+    "Minimum downtime (h)": 4,
+    "Minimum uptime (h)": 4,
+    "Initial status (h)": 12,
+    "Initial power (MW)": 115,
+    "Must run?": true,
+  });
+});
+
+test("changeProfiledUnitData with invalid bus", () => {
+  let scenario = TEST_DATA_1;
+  let err = null;
+  [scenario, err] = changeProfiledUnitData("pu1", "Bus", "b99", scenario);
+  assert(err !== null);
+  assert.equal(err.message, 'Bus "b99" does not exist');
+});
+
+test("deleteGenerator", () => {
+  const newScenario = deleteGenerator("pu1", TEST_DATA_1);
+  assert.equal(Object.keys(newScenario.Generators).length, 2);
+  assert("g1" in newScenario.Generators);
+  assert("pu2" in newScenario.Generators);
+});
+
+test("renameGenerator", () => {
+  const [newScenario, err] = renameGenerator("pu1", "pu5", TEST_DATA_1);
+  assert(err === null);
+  assert.deepEqual(newScenario.Generators["pu5"], {
+    Bus: "b1",
+    Type: "Profiled",
+    "Cost ($/MW)": 12.5,
+    "Maximum power (MW)": [10, 12, 13, 15, 20],
+    "Minimum power (MW)": [0, 0, 0, 0, 0],
+  });
+  assert.deepEqual(newScenario.Generators["pu2"], {
+    Bus: "b1",
+    Type: "Profiled",
+    "Cost ($/MW)": 120,
+    "Maximum power (MW)": [50, 50, 50, 50, 50],
+    "Minimum power (MW)": [0, 0, 0, 0, 0],
+  });
+});

web/frontend/src/core/Operations/generatorOps.ts

@@ -0,0 +1,152 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { generateTimeslots } from "../../components/Common/Forms/DataTable";
+import { ValidationError } from "../Data/validate";
+import {
+  assertBusesNotEmpty,
+  changeData,
+  generateUniqueName,
+  renameItemInObject,
+} from "./commonOps";
+import { ProfiledUnitsColumnSpec } from "../../components/CaseBuilder/ProfiledUnits";
+import { ThermalUnitsColumnSpec } from "../../components/CaseBuilder/ThermalUnits";
+import { Generators, UnitCommitmentScenario } from "../Data/types";
+
+export const createProfiledUnit = (
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const err = assertBusesNotEmpty(scenario);
+  if (err) return [scenario, err];
+  const busName = Object.keys(scenario.Buses)[0]!;
+  const timeslots = generateTimeslots(scenario);
+  const name = generateUniqueName(scenario.Generators, "pu");
+  return [
+    {
+      ...scenario,
+      Generators: {
+        ...scenario.Generators,
+        [name]: {
+          Bus: busName,
+          Type: "Profiled",
+          "Cost ($/MW)": 0,
+          "Minimum power (MW)": Array(timeslots.length).fill(0),
+          "Maximum power (MW)": Array(timeslots.length).fill(0),
+        },
+      },
+    },
+    null,
+  ];
+};
+
+export const createThermalUnit = (
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const err = assertBusesNotEmpty(scenario);
+  if (err) return [scenario, err];
+  const busName = Object.keys(scenario.Buses)[0]!;
+  const name = generateUniqueName(scenario.Generators, "g");
+  return [
+    {
+      ...scenario,
+      Generators: {
+        ...scenario.Generators,
+        [name]: {
+          Bus: busName,
+          Type: "Thermal",
+          "Production cost curve (MW)": [0, 100],
+          "Production cost curve ($)": [0, 10],
+          "Startup costs ($)": [0],
+          "Startup delays (h)": [1],
+          "Ramp up limit (MW)": null,
+          "Ramp down limit (MW)": null,
+          "Startup limit (MW)": null,
+          "Shutdown limit (MW)": null,
+          "Minimum downtime (h)": 1,
+          "Minimum uptime (h)": 1,
+          "Initial status (h)": -24,
+          "Initial power (MW)": 0,
+          "Must run?": false,
+        },
+      },
+    },
+    null,
+  ];
+};
+
+export const changeProfiledUnitData = (
+  generator: string,
+  field: string,
+  newValueStr: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newGen, err] = changeData(
+    field,
+    newValueStr,
+    scenario.Generators[generator]!,
+    ProfiledUnitsColumnSpec,
+    scenario,
+  );
+  if (err) return [scenario, err];
+  return [
+    {
+      ...scenario,
+      Generators: {
+        ...scenario.Generators,
+        [generator]: newGen,
+      } as Generators,
+    },
+    null,
+  ];
+};
+
+export const changeThermalUnitData = (
+  generator: string,
+  field: string,
+  newValueStr: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newGen, err] = changeData(
+    field,
+    newValueStr,
+    scenario.Generators[generator]!,
+    ThermalUnitsColumnSpec,
+    scenario,
+  );
+  if (err) return [scenario, err];
+  return [
+    {
+      ...scenario,
+      Generators: {
+        ...scenario.Generators,
+        [generator]: newGen,
+      } as Generators,
+    },
+    null,
+  ];
+};
+
+export const deleteGenerator = (
+  name: string,
+  scenario: UnitCommitmentScenario,
+): UnitCommitmentScenario => {
+  const { [name]: _, ...newGenerators } = scenario.Generators;
+  return { ...scenario, Generators: newGenerators };
+};
+
+export const renameGenerator = (
+  oldName: string,
+  newName: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newGen, err] = renameItemInObject(
+    oldName,
+    newName,
+    scenario.Generators,
+  );
+  if (err) return [scenario, err];
+  return [{ ...scenario, Generators: newGen }, null];
+};

web/frontend/src/core/Operations/parameterOps.test.ts

@@ -0,0 +1,137 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import {
+  changeTimeHorizon,
+  changeTimeStep,
+  evaluatePwlFunction,
+} from "./parameterOps";
+import assert from "node:assert";
+import { TEST_DATA_1, TEST_DATA_2 } from "../Data/fixtures.test";
+
+test("changeTimeHorizon: Shrink 1", () => {
+  const [newScenario, err] = changeTimeHorizon(TEST_DATA_1, "3");
+  assert(err === null);
+  assert.deepEqual(newScenario.Parameters, {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 3,
+    "Time step (min)": 60,
+  });
+  assert.deepEqual(newScenario.Buses, {
+    b1: { "Load (MW)": [35.79534, 34.38835, 33.45083] },
+    b2: { "Load (MW)": [14.03739, 13.48563, 13.11797] },
+    b3: { "Load (MW)": [27.3729, 26.29698, 25.58005] },
+  });
+});
+
+test("changeTimeHorizon: Shrink 2", () => {
+  const [newScenario, err] = changeTimeHorizon(TEST_DATA_2, "1");
+  assert(err === null);
+  assert.deepEqual(newScenario.Parameters, {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 1,
+    "Time step (min)": 30,
+  });
+  assert.deepEqual(newScenario.Buses, {
+    b1: { "Load (MW)": [30, 30] },
+    b2: { "Load (MW)": [10, 20] },
+    b3: { "Load (MW)": [0, 30] },
+  });
+});
+
+test("changeTimeHorizon grow", () => {
+  const [newScenario, err] = changeTimeHorizon(TEST_DATA_1, "7");
+  assert(err === null);
+  assert.deepEqual(newScenario.Parameters, {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 7,
+    "Time step (min)": 60,
+  });
+  assert.deepEqual(newScenario.Buses, {
+    b1: {
+      "Load (MW)": [35.79534, 34.38835, 33.45083, 32.89729, 33.25044, 0, 0],
+    },
+    b2: {
+      "Load (MW)": [14.03739, 13.48563, 13.11797, 12.9009, 13.03939, 0, 0],
+    },
+    b3: {
+      "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 25.4268, 0, 0],
+    },
+  });
+});
+
+test("changeTimeHorizon invalid", () => {
+  let [, err] = changeTimeHorizon(TEST_DATA_1, "x");
+  assert(err !== null);
+  assert.equal(err.message, "Invalid value: x");
+
+  [, err] = changeTimeHorizon(TEST_DATA_1, "-3");
+  assert(err !== null);
+  assert.equal(err.message, "Invalid value: -3");
+});
+
+test("evaluatePwlFunction", () => {
+  const data_x = [0, 60, 120, 180];
+  const data_y = [100, 200, 250, 100];
+  assert.equal(evaluatePwlFunction(data_x, data_y, 0), 100);
+  assert.equal(evaluatePwlFunction(data_x, data_y, 15), 125);
+  assert.equal(evaluatePwlFunction(data_x, data_y, 30), 150);
+  assert.equal(evaluatePwlFunction(data_x, data_y, 60), 200);
+  assert.equal(evaluatePwlFunction(data_x, data_y, 180), 100);
+});
+
+test("changeTimeStep", () => {
+  let [scenario, err] = changeTimeStep(TEST_DATA_2, "15");
+  assert(err === null);
+  assert.deepEqual(scenario.Parameters, {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 2,
+    "Time step (min)": 15,
+  });
+  assert.deepEqual(scenario.Buses, {
+    b1: { "Load (MW)": [30, 30, 30, 30, 30, 30, 30, 30] },
+    b2: { "Load (MW)": [10, 15, 20, 25, 30, 35, 40, 25] },
+    b3: { "Load (MW)": [0, 15, 30, 15, 0, 20, 40, 20] },
+  });
+
+  [scenario, err] = changeTimeStep(TEST_DATA_2, "60");
+  assert(err === null);
+  assert.deepEqual(scenario.Parameters, {
+    Version: "0.4",
+    "Power balance penalty ($/MW)": 1000.0,
+    "Time horizon (h)": 2,
+    "Time step (min)": 60,
+  });
+  assert.deepEqual(scenario.Buses, {
+    b1: { "Load (MW)": [30, 30] },
+    b2: { "Load (MW)": [10, 30] },
+    b3: { "Load (MW)": [0, 0] },
+  });
+});
+
+test("changeTimeStep invalid", () => {
+  let [, err] = changeTimeStep(TEST_DATA_2, "x");
+  assert(err !== null);
+  assert.equal(err.message, "Invalid value: x");
+
+  [, err] = changeTimeStep(TEST_DATA_2, "-10");
+  assert(err !== null);
+  assert.equal(err.message, "Invalid value: -10");
+
+  [, err] = changeTimeStep(TEST_DATA_2, "120");
+  assert(err !== null);
+  assert.equal(err.message, "Invalid value: 120");
+
+  [, err] = changeTimeStep(TEST_DATA_2, "7");
+  assert(err !== null);
+  assert.equal(err.message, "Time step must be a divisor of 60: 7");
+});
+
+export {};

web/frontend/src/core/Operations/parameterOps.ts

@@ -0,0 +1,221 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { Buses } from "../Data/fixtures";
+import { ValidationError } from "../Data/validate";
+import { UnitCommitmentScenario } from "../Data/types";
+
+export const changeTimeHorizon = (
+  scenario: UnitCommitmentScenario,
+  newTimeHorizonStr: string,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  // Parse string
+  const newTimeHorizon = parseInt(newTimeHorizonStr);
+  if (isNaN(newTimeHorizon) || newTimeHorizon <= 0) {
+    return [scenario, { message: `Invalid value: ${newTimeHorizonStr}` }];
+  }
+  const newScenario = JSON.parse(
+    JSON.stringify(scenario),
+  ) as UnitCommitmentScenario;
+  newScenario.Parameters["Time horizon (h)"] = newTimeHorizon;
+  const newT = (newTimeHorizon * 60) / scenario.Parameters["Time step (min)"];
+  const oldT =
+    (scenario.Parameters["Time horizon (h)"] * 60) /
+    scenario.Parameters["Time step (min)"];
+  if (newT < oldT) {
+    Object.values(newScenario.Buses).forEach((bus) => {
+      bus["Load (MW)"] = bus["Load (MW)"].slice(0, newT);
+    });
+    Object.values(newScenario.Generators).forEach((generator) => {
+      if (generator.Type === "Profiled") {
+        generator["Minimum power (MW)"] = generator["Minimum power (MW)"].slice(0, newT);
+        generator["Maximum power (MW)"] = generator["Maximum power (MW)"].slice(0, newT);
+      }
+    });
+    Object.values(newScenario["Price-sensitive loads"]).forEach((psLoad) => {
+      psLoad["Demand (MW)"] = psLoad["Demand (MW)"].slice(0, newT);
+    });
+  } else {
+    const padding = Array(newT - oldT).fill(0);
+    Object.values(newScenario.Buses).forEach((bus) => {
+      bus["Load (MW)"] = bus["Load (MW)"].concat(padding);
+    });
+    Object.values(newScenario.Generators).forEach((generator) => {
+      if (generator.Type === "Profiled") {
+        generator["Minimum power (MW)"] = generator["Minimum power (MW)"].concat(padding);
+        generator["Maximum power (MW)"] = generator["Maximum power (MW)"].concat(padding);
+      }
+    });
+    Object.values(newScenario["Price-sensitive loads"]).forEach((psLoad) => {
+      psLoad["Demand (MW)"] = psLoad["Demand (MW)"].concat(padding);
+    });
+  }
+  return [newScenario, null];
+};
+
+export const evaluatePwlFunction = (
+  data_x: number[],
+  data_y: number[],
+  x: number,
+) => {
+  if (x < data_x[0]! || x > data_x[data_x.length - 1]!) {
+    throw Error("PWL interpolation: Out of bounds");
+  }
+
+  if (x === data_x[0]) return data_y[0];
+
+  // Binary search to find the interval containing x
+  let low = 0;
+  let high = data_x.length - 1;
+  while (low < high) {
+    let mid = Math.floor((low + high) / 2);
+    if (data_x[mid]! < x) low = mid + 1;
+    else high = mid;
+  }
+
+  // Linear interpolation within the found interval
+  const x1 = data_x[low - 1]!;
+  const y1 = data_y[low - 1]!;
+  const x2 = data_x[low]!;
+  const y2 = data_y[low]!;
+
+  return y1 + ((x - x1) * (y2 - y1)) / (x2 - x1);
+};
+
+export const changeTimeStep = (
+  scenario: UnitCommitmentScenario,
+  newTimeStepStr: string,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  // Parse string and perform validation
+  const newTimeStep = parseFloat(newTimeStepStr);
+  if (isNaN(newTimeStep) || newTimeStep < 1 || newTimeStep > 60) {
+    return [scenario, { message: `Invalid value: ${newTimeStepStr}` }];
+  }
+  if (60 % newTimeStep !== 0) {
+    return [
+      scenario,
+      { message: `Time step must be a divisor of 60: ${newTimeStepStr}` },
+    ];
+  }
+
+  // Build data_x
+  let timeHorizon = scenario.Parameters["Time horizon (h)"];
+  const oldTimeStep = scenario.Parameters["Time step (min)"];
+  const oldT = (timeHorizon * 60) / oldTimeStep;
+  const newT = (timeHorizon * 60) / newTimeStep;
+  const data_x = Array(oldT + 1).fill(0);
+  for (let i = 0; i <= oldT; i++) data_x[i] = i * oldTimeStep;
+
+  const newBuses: Buses = {};
+  for (const busName in scenario.Buses) {
+    // Build data_y
+    const busLoad = scenario.Buses[busName]!["Load (MW)"];
+    const data_y = Array(oldT + 1).fill(0);
+    for (let i = 0; i < oldT; i++) data_y[i] = busLoad[i];
+    data_y[oldT] = data_y[0];
+
+    // Run interpolation
+    const newBusLoad = Array(newT).fill(0);
+    for (let i = 0; i < newT; i++) {
+      newBusLoad[i] = evaluatePwlFunction(data_x, data_y, newTimeStep * i);
+    }
+    newBuses[busName] = {
+      ...scenario.Buses[busName],
+      "Load (MW)": newBusLoad,
+    };
+  }
+
+  const newGenerators: { [name: string]: any } = {};
+  for (const generatorName in scenario.Generators) {
+    const generator = scenario.Generators[generatorName]!;
+    if (generator.Type === "Profiled") {
+      // Build data_y for minimum power
+      const minPower = generator["Minimum power (MW)"];
+      const minData_y = Array(oldT + 1).fill(0);
+      for (let i = 0; i < oldT; i++) minData_y[i] = minPower[i];
+      minData_y[oldT] = minData_y[0];
+
+      // Build data_y for maximum power
+      const maxPower = generator["Maximum power (MW)"];
+      const maxData_y = Array(oldT + 1).fill(0);
+      for (let i = 0; i < oldT; i++) maxData_y[i] = maxPower[i];
+      maxData_y[oldT] = maxData_y[0];
+
+      // Run interpolation for both
+      const newMinPower = Array(newT).fill(0);
+      const newMaxPower = Array(newT).fill(0);
+      for (let i = 0; i < newT; i++) {
+        newMinPower[i] = evaluatePwlFunction(data_x, minData_y, newTimeStep * i);
+        newMaxPower[i] = evaluatePwlFunction(data_x, maxData_y, newTimeStep * i);
+      }
+
+      newGenerators[generatorName] = {
+        ...generator,
+        "Minimum power (MW)": newMinPower,
+        "Maximum power (MW)": newMaxPower,
+      };
+    } else {
+      newGenerators[generatorName] = generator;
+    }
+  }
+
+  const newPriceSensitiveLoads: { [name: string]: any } = {};
+  for (const psLoadName in scenario["Price-sensitive loads"]) {
+    const psLoad = scenario["Price-sensitive loads"][psLoadName]!;
+    
+    // Build data_y for demand
+    const demand = psLoad["Demand (MW)"];
+    const demandData_y = Array(oldT + 1).fill(0);
+    for (let i = 0; i < oldT; i++) demandData_y[i] = demand[i];
+    demandData_y[oldT] = demandData_y[0];
+
+    // Run interpolation for demand
+    const newDemand = Array(newT).fill(0);
+    for (let i = 0; i < newT; i++) {
+      newDemand[i] = evaluatePwlFunction(data_x, demandData_y, newTimeStep * i);
+    }
+
+    newPriceSensitiveLoads[psLoadName] = {
+      ...psLoad,
+      "Demand (MW)": newDemand,
+    };
+  }
+
+  return [
+    {
+      ...scenario,
+      Parameters: {
+        ...scenario.Parameters,
+        "Time step (min)": newTimeStep,
+      },
+      Buses: newBuses,
+      Generators: newGenerators,
+      "Price-sensitive loads": newPriceSensitiveLoads,
+    },
+    null,
+  ];
+};
+
+export const changeParameter = (
+  scenario: UnitCommitmentScenario,
+  key: string,
+  valueStr: string,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const value = parseFloat(valueStr);
+  if (isNaN(value)) {
+    return [scenario, { message: `Invalid value: ${valueStr}` }];
+  }
+  return [
+    {
+      ...scenario,
+      Parameters: {
+        ...scenario.Parameters,
+        [key]: value,
+      },
+    },
+    null,
+  ];
+};

web/frontend/src/core/Operations/preprocessing.test.ts

@@ -0,0 +1,46 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import assert from "node:assert";
+import { preprocess } from "./preprocessing";
+
+export const PREPROCESSING_TEST_DATA_1: any = {
+  Parameters: {
+    Version: "0.4",
+    "Time horizon (h)": 5,
+  },
+  Buses: {
+    b1: { "Load (MW)": [35.79534, 34.38835, 33.45083, 32.89729, 33.25044] },
+    b2: { "Load (MW)": 10 },
+    b3: { "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 25.4268] },
+  },
+};
+
+test("preprocess", () => {
+  const [newScenario, err] = preprocess(PREPROCESSING_TEST_DATA_1);
+  assert(err === null);
+  assert.deepEqual(newScenario, {
+    Parameters: {
+      Version: "0.4",
+      "Time horizon (h)": 5,
+      "Power balance penalty ($/MW)": 1000,
+      "Scenario name": "s1",
+      "Scenario weight": 1,
+      "Time step (min)": 60,
+    },
+    Buses: {
+      b1: { "Load (MW)": [35.79534, 34.38835, 33.45083, 32.89729, 33.25044] },
+      b2: { "Load (MW)": [10, 10, 10, 10, 10] },
+      b3: { "Load (MW)": [27.3729, 26.29698, 25.58005, 25.15675, 25.4268] },
+    },
+    "Price-sensitive loads": {},
+    "Storage units": {},
+    "Transmission lines": {},
+    Contingencies: {},
+    Generators: {},
+    Reserves: {},
+  });
+});

web/frontend/src/core/Operations/preprocessing.ts

@@ -0,0 +1,70 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { validate, ValidationError } from "../Data/validate";
+import { UnitCommitmentScenario } from "../Data/types";
+import { migrate } from "../Data/migrate";
+import {
+  getContingencyTransmissionLines,
+  rebuildContingencies,
+} from "./transmissionOps";
+
+export const preprocess = (
+  data: any,
+): [UnitCommitmentScenario | null, ValidationError | null] => {
+  // Make a copy of the original data
+  let result = JSON.parse(JSON.stringify(data));
+
+  // Run migration
+  migrate(result);
+
+  // Run JSON validation and assign default values
+  if (!validate(result)) {
+    console.error(validate.errors);
+    return [
+      null,
+      { message: "Invalid JSON file. See console for more details." },
+    ];
+  }
+
+  // Expand scalars into arrays
+  // @ts-ignore
+  const timeHorizon = result["Parameters"]["Time horizon (h)"];
+  // @ts-ignore
+  const timeStep = result["Parameters"]["Time step (min)"];
+  const T = (timeHorizon * 60) / timeStep;
+  for (const busName in result["Buses"]) {
+    // @ts-ignore
+    const busData = result["Buses"][busName];
+    const busLoad = busData["Load (MW)"];
+    if (typeof busLoad === "number") {
+      busData["Load (MW)"] = Array(T).fill(busLoad);
+    }
+  }
+
+  // Add optional fields
+  for (let field of [
+    "Buses",
+    "Generators",
+    "Storage units",
+    "Price-sensitive loads",
+    "Transmission lines",
+    "Reserves",
+    "Contingencies",
+  ]) {
+    if (!result[field]) {
+      result[field] = {};
+    }
+  }
+
+  const scenario = result as unknown as UnitCommitmentScenario;
+
+  // Rebuild contingencies
+  const contingencyLines = getContingencyTransmissionLines(scenario);
+  scenario["Contingencies"] = rebuildContingencies(contingencyLines);
+
+  return [scenario, null];
+};

web/frontend/src/core/Operations/psloadOps.test.ts

@@ -0,0 +1,60 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { TEST_DATA_1 } from "../Data/fixtures.test";
+import assert from "node:assert";
+import {
+  changePriceSensitiveLoadData,
+  createPriceSensitiveLoad,
+  deletePriceSensitiveLoad,
+  renamePriceSensitiveLoad,
+} from "./psloadOps";
+import { ValidationError } from "../Data/validate";
+
+test("createPriceSensitiveLoad", () => {
+  const [newScenario, err] = createPriceSensitiveLoad(TEST_DATA_1);
+  assert(err === null);
+  assert.equal(Object.keys(newScenario["Price-sensitive loads"]).length, 2);
+  assert("ps2" in newScenario["Price-sensitive loads"]);
+});
+
+test("renamePriceSensitiveLoad", () => {
+  const [newScenario, err] = renamePriceSensitiveLoad(
+    "ps1",
+    "ps2",
+    TEST_DATA_1,
+  );
+  assert(err === null);
+  assert.deepEqual(
+    newScenario["Price-sensitive loads"]["ps2"],
+    TEST_DATA_1["Price-sensitive loads"]["ps1"],
+  );
+  assert.equal(Object.keys(newScenario["Price-sensitive loads"]).length, 1);
+});
+
+test("changePriceSensitiveLoadData", () => {
+  let scenario = TEST_DATA_1;
+  let err: ValidationError | null;
+  [scenario, err] = changePriceSensitiveLoadData("ps1", "Bus", "b3", scenario);
+  assert.equal(err, null);
+  [scenario, err] = changePriceSensitiveLoadData(
+    "ps1",
+    "Demand (MW) 00:00",
+    "99",
+    scenario,
+  );
+  assert.equal(err, null);
+  assert.deepEqual(scenario["Price-sensitive loads"]["ps1"], {
+    Bus: "b3",
+    "Revenue ($/MW)": 23,
+    "Demand (MW)": [99, 50, 50, 50, 50],
+  });
+});
+
+test("deletePriceSensitiveLoad", () => {
+  const newScenario = deletePriceSensitiveLoad("ps1", TEST_DATA_1);
+  assert.equal(Object.keys(newScenario["Price-sensitive loads"]).length, 0);
+});

web/frontend/src/core/Operations/psloadOps.ts

@@ -0,0 +1,88 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { ValidationError } from "../Data/validate";
+import { PriceSensitiveLoad, UnitCommitmentScenario } from "../Data/types";
+import {
+  assertBusesNotEmpty,
+  changeData,
+  generateUniqueName,
+  renameItemInObject,
+} from "./commonOps";
+import { PriceSensitiveLoadsColumnSpec } from "../../components/CaseBuilder/Psload";
+import { generateTimeslots } from "../../components/Common/Forms/DataTable";
+
+export const createPriceSensitiveLoad = (
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const err = assertBusesNotEmpty(scenario);
+  if (err) return [scenario, err];
+  const busName = Object.keys(scenario.Buses)[0]!;
+  const timeslots = generateTimeslots(scenario);
+  const name = generateUniqueName(scenario["Price-sensitive loads"], "ps");
+  return [
+    {
+      ...scenario,
+      "Price-sensitive loads": {
+        ...scenario["Price-sensitive loads"],
+        [name]: {
+          Bus: busName,
+          "Revenue ($/MW)": 0,
+          "Demand (MW)": Array(timeslots.length).fill(0),
+        },
+      },
+    },
+    null,
+  ];
+};
+
+export const renamePriceSensitiveLoad = (
+  oldName: string,
+  newName: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newObj, err] = renameItemInObject(
+    oldName,
+    newName,
+    scenario["Price-sensitive loads"],
+  );
+  if (err) return [scenario, err];
+  return [{ ...scenario, "Price-sensitive loads": newObj }, null];
+};
+
+export const changePriceSensitiveLoadData = (
+  name: string,
+  field: string,
+  newValueStr: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newObj, err] = changeData(
+    field,
+    newValueStr,
+    scenario["Price-sensitive loads"][name]!,
+    PriceSensitiveLoadsColumnSpec,
+    scenario,
+  );
+  if (err) return [scenario, err];
+  return [
+    {
+      ...scenario,
+      "Price-sensitive loads": {
+        ...scenario["Price-sensitive loads"],
+        [name]: newObj as PriceSensitiveLoad,
+      },
+    },
+    null,
+  ];
+};
+
+export const deletePriceSensitiveLoad = (
+  name: string,
+  scenario: UnitCommitmentScenario,
+): UnitCommitmentScenario => {
+  const { [name]: _, ...newContainer } = scenario["Price-sensitive loads"];
+  return { ...scenario, "Price-sensitive loads": newContainer };
+};

web/frontend/src/core/Operations/storageOps.test.ts

@@ -0,0 +1,75 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { TEST_DATA_1 } from "../Data/fixtures.test";
+import assert from "node:assert";
+import {
+  changeStorageUnitData,
+  createStorageUnit,
+  deleteStorageUnit,
+  renameStorageUnit,
+} from "./storageOps";
+import { ValidationError } from "../Data/validate";
+
+test("createStorageUnit", () => {
+  const [newScenario, err] = createStorageUnit(TEST_DATA_1);
+  assert(err === null);
+  assert.equal(Object.keys(newScenario["Storage units"]).length, 2);
+  assert("su2" in newScenario["Storage units"]);
+});
+
+test("renameStorageUnit", () => {
+  const [newScenario, err] = renameStorageUnit("su1", "su2", TEST_DATA_1);
+  assert(err === null);
+  assert.deepEqual(
+    newScenario["Storage units"]["su2"],
+    TEST_DATA_1["Storage units"]["su1"],
+  );
+  assert.equal(Object.keys(newScenario["Storage units"]).length, 1);
+});
+
+test("changeStorageUnitData", () => {
+  let scenario = TEST_DATA_1;
+  let err: ValidationError | null;
+  [scenario, err] = changeStorageUnitData("su1", "Bus", "b3", scenario);
+  assert.equal(err, null);
+  [scenario, err] = changeStorageUnitData(
+    "su1",
+    "Minimum level (MWh)",
+    "99",
+    scenario,
+  );
+  assert.equal(err, null);
+  [scenario, err] = changeStorageUnitData(
+    "su1",
+    "Maximum discharge rate (MW)",
+    "99",
+    scenario,
+  );
+  assert.equal(err, null);
+  assert.deepEqual(scenario["Storage units"]["su1"], {
+    Bus: "b3",
+    "Minimum level (MWh)": 99.0,
+    "Maximum level (MWh)": 100.0,
+    "Charge cost ($/MW)": 2.0,
+    "Discharge cost ($/MW)": 1.0,
+    "Charge efficiency": 0.8,
+    "Discharge efficiency": 0.85,
+    "Loss factor": 0.01,
+    "Minimum charge rate (MW)": 5.0,
+    "Maximum charge rate (MW)": 10.0,
+    "Minimum discharge rate (MW)": 4.0,
+    "Maximum discharge rate (MW)": 99.0,
+    "Initial level (MWh)": 20.0,
+    "Last period minimum level (MWh)": 21.0,
+    "Last period maximum level (MWh)": 22.0,
+  });
+});
+
+test("deleteStorageUnit", () => {
+  const newScenario = deleteStorageUnit("su1", TEST_DATA_1);
+  assert.equal(Object.keys(newScenario["Storage units"]).length, 0);
+});

web/frontend/src/core/Operations/storageOps.ts

@@ -0,0 +1,98 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { ValidationError } from "../Data/validate";
+import { StorageUnit, UnitCommitmentScenario } from "../Data/types";
+import {
+  assertBusesNotEmpty,
+  changeData,
+  generateUniqueName,
+  renameItemInObject,
+} from "./commonOps";
+import { StorageUnitsColumnSpec } from "../../components/CaseBuilder/StorageUnits";
+
+export const createStorageUnit = (
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const err = assertBusesNotEmpty(scenario);
+  if (err) return [scenario, err];
+  const busName = Object.keys(scenario.Buses)[0]!;
+  const name = generateUniqueName(scenario["Storage units"], "su");
+  return [
+    {
+      ...scenario,
+      "Storage units": {
+        ...scenario["Storage units"],
+        [name]: {
+          Bus: busName,
+          "Minimum level (MWh)": 0,
+          "Maximum level (MWh)": 1,
+          "Charge cost ($/MW)": 0.0,
+          "Discharge cost ($/MW)": 0.0,
+          "Charge efficiency": 1,
+          "Discharge efficiency": 1,
+          "Loss factor": 0,
+          "Minimum charge rate (MW)": 1,
+          "Maximum charge rate (MW)": 1,
+          "Minimum discharge rate (MW)": 1,
+          "Maximum discharge rate (MW)": 1,
+          "Initial level (MWh)": 0,
+          "Last period minimum level (MWh)": 0,
+          "Last period maximum level (MWh)": 1,
+        },
+      },
+    },
+    null,
+  ];
+};
+
+export const renameStorageUnit = (
+  oldName: string,
+  newName: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newObj, err] = renameItemInObject(
+    oldName,
+    newName,
+    scenario["Storage units"],
+  );
+  if (err) return [scenario, err];
+  return [{ ...scenario, "Storage units": newObj }, null];
+};
+
+export const changeStorageUnitData = (
+  name: string,
+  field: string,
+  newValueStr: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newObj, err] = changeData(
+    field,
+    newValueStr,
+    scenario["Storage units"][name]!,
+    StorageUnitsColumnSpec,
+    scenario,
+  );
+  if (err) return [scenario, err];
+  return [
+    {
+      ...scenario,
+      "Storage units": {
+        ...scenario["Storage units"],
+        [name]: newObj as StorageUnit,
+      },
+    },
+    null,
+  ];
+};
+
+export const deleteStorageUnit = (
+  name: string,
+  scenario: UnitCommitmentScenario,
+): UnitCommitmentScenario => {
+  const { [name]: _, ...newContainer } = scenario["Storage units"];
+  return { ...scenario, "Storage units": newContainer };
+};

web/frontend/src/core/Operations/transmissionOps.test.ts

@@ -0,0 +1,102 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { TEST_DATA_1 } from "../Data/fixtures.test";
+import assert from "node:assert";
+import {
+  changeTransmissionLineData,
+  createTransmissionLine,
+  deleteTransmissionLine,
+  getContingencyTransmissionLines,
+  rebuildContingencies,
+  renameTransmissionLine,
+} from "./transmissionOps";
+import { ValidationError } from "../Data/validate";
+
+test("createTransmissionLine", () => {
+  const [newScenario, err] = createTransmissionLine(TEST_DATA_1);
+  assert(err === null);
+  assert.equal(Object.keys(newScenario["Transmission lines"]).length, 2);
+  assert("l2" in newScenario["Transmission lines"]);
+});
+
+test("renameTransmissionLine", () => {
+  const [newScenario, err] = renameTransmissionLine("l1", "l3", TEST_DATA_1);
+  assert(err === null);
+  assert.deepEqual(newScenario["Transmission lines"]["l3"], {
+    "Source bus": "b1",
+    "Target bus": "b2",
+    "Susceptance (S)": 29.49686,
+    "Normal flow limit (MW)": 15000.0,
+    "Emergency flow limit (MW)": 20000.0,
+    "Flow limit penalty ($/MW)": 5000.0,
+  });
+  assert.deepEqual(newScenario["Contingencies"], {
+    l3: {
+      "Affected lines": ["l3"],
+      "Affected generators": [],
+    },
+  });
+  assert.equal(Object.keys(newScenario["Transmission lines"]).length, 1);
+});
+
+test("changeTransmissionLineData", () => {
+  let scenario = TEST_DATA_1;
+  let err: ValidationError | null;
+  [scenario, err] = changeTransmissionLineData(
+    "l1",
+    "Source bus",
+    "b3",
+    scenario,
+  );
+  assert.equal(err, null);
+  [scenario, err] = changeTransmissionLineData(
+    "l1",
+    "Normal flow limit (MW)",
+    "99",
+    scenario,
+  );
+  assert.equal(err, null);
+  [scenario, err] = changeTransmissionLineData(
+    "l1",
+    "Target bus",
+    "b1",
+    scenario,
+  );
+  assert.equal(err, null);
+  assert.deepEqual(scenario["Transmission lines"]["l1"], {
+    "Source bus": "b3",
+    "Target bus": "b1",
+    "Susceptance (S)": 29.49686,
+    "Normal flow limit (MW)": 99,
+    "Emergency flow limit (MW)": 20000.0,
+    "Flow limit penalty ($/MW)": 5000.0,
+  });
+});
+
+test("deleteTransmissionLine", () => {
+  const newScenario = deleteTransmissionLine("l1", TEST_DATA_1);
+  assert.equal(Object.keys(newScenario["Transmission lines"]).length, 0);
+  assert.equal(Object.keys(newScenario["Contingencies"]).length, 0);
+});
+
+test("getContingencyTransmissionLines", () => {
+  const contLines = getContingencyTransmissionLines(TEST_DATA_1);
+  assert.deepEqual(contLines, new Set(["l1"]));
+});
+
+test("rebuildContingencies", () => {
+  assert.deepEqual(rebuildContingencies(new Set(["l1", "l2"])), {
+    l1: {
+      "Affected lines": ["l1"],
+      "Affected generators": [],
+    },
+    l2: {
+      "Affected lines": ["l2"],
+      "Affected generators": [],
+    },
+  });
+});

web/frontend/src/core/Operations/transmissionOps.ts

@@ -0,0 +1,163 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import {
+  assertBusesNotEmpty,
+  changeData,
+  generateUniqueName,
+  parseBool,
+  renameItemInObject,
+} from "./commonOps";
+import { ValidationError } from "../Data/validate";
+import { TransmissionLinesColumnSpec } from "../../components/CaseBuilder/TransmissionLines";
+import {
+  Contingency,
+  TransmissionLine,
+  UnitCommitmentScenario,
+} from "../Data/types";
+
+export const createTransmissionLine = (
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const err = assertBusesNotEmpty(scenario);
+  if (err) return [scenario, err];
+  const busName = Object.keys(scenario.Buses)[0]!;
+  const name = generateUniqueName(scenario["Transmission lines"], "l");
+  return [
+    {
+      ...scenario,
+      "Transmission lines": {
+        ...scenario["Transmission lines"],
+        [name]: {
+          "Source bus": busName,
+          "Target bus": busName,
+          "Susceptance (S)": 1.0,
+          "Normal flow limit (MW)": 1000,
+          "Emergency flow limit (MW)": 1500,
+          "Flow limit penalty ($/MW)": 5000.0,
+        },
+      },
+    },
+    null,
+  ];
+};
+
+export const renameTransmissionLine = (
+  oldName: string,
+  newName: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  const [newLine, err] = renameItemInObject(
+    oldName,
+    newName,
+    scenario["Transmission lines"],
+  );
+  if (err) return [scenario, err];
+
+  // Update transmission line contingencies
+  let newContingencies = scenario["Contingencies"];
+  const contingencyLines = getContingencyTransmissionLines(scenario);
+  if (contingencyLines.has(oldName)) {
+    contingencyLines.delete(oldName);
+    contingencyLines.add(newName);
+    newContingencies = rebuildContingencies(contingencyLines);
+  }
+
+  return [
+    {
+      ...scenario,
+      "Transmission lines": newLine,
+      Contingencies: newContingencies,
+    },
+    null,
+  ];
+};
+
+export const changeTransmissionLineData = (
+  line: string,
+  field: string,
+  newValueStr: string,
+  scenario: UnitCommitmentScenario,
+): [UnitCommitmentScenario, ValidationError | null] => {
+  if (field === "Contingency?") {
+    // Parse boolean value
+    const [newValue, err] = parseBool(newValueStr);
+    if (err) return [scenario, err];
+
+    // Rebuild contingencies
+    const contLines = getContingencyTransmissionLines(scenario);
+    if (newValue) contLines.add(line);
+    else contLines.delete(line);
+    const newContingencies = rebuildContingencies(contLines);
+
+    return [{ ...scenario, Contingencies: newContingencies }, null];
+  } else {
+    const [newLine, err] = changeData(
+      field,
+      newValueStr,
+      scenario["Transmission lines"][line]!,
+      TransmissionLinesColumnSpec,
+      scenario,
+    );
+    if (err) return [scenario, err];
+    return [
+      {
+        ...scenario,
+        "Transmission lines": {
+          ...scenario["Transmission lines"],
+          [line]: newLine as TransmissionLine,
+        },
+      },
+      null,
+    ];
+  }
+};
+
+export const deleteTransmissionLine = (
+  name: string,
+  scenario: UnitCommitmentScenario,
+): UnitCommitmentScenario => {
+  const { [name]: _, ...newLines } = scenario["Transmission lines"];
+
+  // Update transmission line contingencies
+  let newContingencies = scenario["Contingencies"];
+  const contingencyLines = getContingencyTransmissionLines(scenario);
+  if (contingencyLines.has(name)) {
+    contingencyLines.delete(name);
+    newContingencies = rebuildContingencies(contingencyLines);
+  }
+
+  return {
+    ...scenario,
+    "Transmission lines": newLines,
+    Contingencies: newContingencies,
+  };
+};
+
+export const getContingencyTransmissionLines = (
+  scenario: UnitCommitmentScenario,
+): Set<String> => {
+  let result: Set<String> = new Set();
+  Object.entries(scenario.Contingencies).forEach(([name, contingency]) => {
+    if (contingency["Affected lines"].length !== 1)
+      throw Error("not implemented");
+    result.add(contingency["Affected lines"][0]!!);
+  });
+  return result;
+};
+
+export const rebuildContingencies = (
+  contingencyLines: Set<String>,
+): { [name: string]: Contingency } => {
+  const result: { [name: string]: Contingency } = {};
+  contingencyLines.forEach((lineName) => {
+    result[lineName as string] = {
+      "Affected lines": [lineName as string],
+      "Affected generators": [],
+    };
+  });
+  return result;
+};

web/frontend/src/index.tsx

@@ -0,0 +1,22 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import React from "react";
+import ReactDOM from "react-dom/client";
+import reportWebVitals from "./reportWebVitals";
+import CaseBuilder from "./components/CaseBuilder/CaseBuilder";
+
+const root = ReactDOM.createRoot(
+  document.getElementById("root") as HTMLElement,
+);
+
+root.render(
+  <React.StrictMode>
+    <CaseBuilder />
+  </React.StrictMode>,
+);
+
+reportWebVitals();

web/frontend/src/logo.svg

@@ -0,0 +1,13 @@
+<!--
+  - UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+  - Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+  - Released under the modified BSD license. See COPYING.md for more details.
+  -->
+
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 841.9 595.3">
+    <g fill="#61DAFB">
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+</svg>

web/frontend/src/react-app-env.d.ts

@@ -0,0 +1,7 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+/// <reference types="react-scripts" />

web/frontend/src/reportWebVitals.ts

@@ -0,0 +1,21 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import { ReportHandler } from "web-vitals";
+
+const reportWebVitals = (onPerfEntry?: ReportHandler) => {
+  if (onPerfEntry && onPerfEntry instanceof Function) {
+    import("web-vitals").then(({ getCLS, getFID, getFCP, getLCP, getTTFB }) => {
+      getCLS(onPerfEntry);
+      getFID(onPerfEntry);
+      getFCP(onPerfEntry);
+      getLCP(onPerfEntry);
+      getTTFB(onPerfEntry);
+    });
+  }
+};
+
+export default reportWebVitals;

web/frontend/src/setupTests.ts

@@ -0,0 +1,7 @@
+/*
+ * UnitCommitment.jl: Optimization Package for Security-Constrained Unit Commitment
+ * Copyright (C) 2020-2025, UChicago Argonne, LLC. All rights reserved.
+ * Released under the modified BSD license. See COPYING.md for more details.
+ */
+
+import "@testing-library/jest-dom";

web/frontend/tsconfig.json

@@ -0,0 +1,35 @@
+{
+  "compilerOptions": {
+    "target": "es5",
+    "lib": ["dom", "dom.iterable", "esnext"],
+    "allowJs": false,
+    "allowSyntheticDefaultImports": true,
+    "alwaysStrict": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "isolatedModules": true,
+    "jsx": "react-jsx",
+    "module": "esnext",
+    "moduleResolution": "node",
+    "noEmit": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitAny": true,
+    "noImplicitOverride": true,
+    "noImplicitReturns": true,
+    "noImplicitThis": true,
+    "resolveJsonModule": true,
+    "skipLibCheck": true,
+    "strict": true,
+    "strictFunctionTypes": true,
+    "strictNullChecks": true,
+    "strictPropertyInitialization": true,
+    "allowUnusedLabels": false,
+    "allowUnreachableCode": false,
+    "exactOptionalPropertyTypes": true,
+    "noUncheckedIndexedAccess": true,
+    "noUnusedLocals": false,
+    "noUnusedParameters": false,
+    "checkJs": true
+  },
+  "include": ["src"]
+}