diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index ed27256..4389c6c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -24,6 +24,7 @@ jobs:
           node-version: 22
           cache: npm
       - run: npm ci
+      - run: npm run lint
       - run: npx playwright install --with-deps chromium
       - run: npm test -- --workers=2
       - uses: actions/upload-artifact@v4
diff --git a/CLAUDE.md b/CLAUDE.md
index 13dd7c3..16fb326 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -12,7 +12,8 @@ A browser-only tool for Australian electricity bills (Amber Electric vs other pl
 ```bash
 npm install
 npm run build:css     # after changing any Tailwind class in index.html or js/; commit css/app.css
-npm run test:unit     # Node unit checks (fast)
+npm run lint          # ESLint: unused or shadowed variables, undefined names, house style
+npm run test:unit     # Node unit checks (fast), starting with a syntax check of every js/*.js
 npm test              # unit checks + Playwright (starts scripts/static-server.js on :4173)
 npx playwright test tests/planner.spec.js --workers=2   # one spec
 npm run serve         # http://127.0.0.1:4173
@@ -40,5 +41,5 @@ If Playwright can't find its browser, point it at an installed Chromium with `la
    - `js/constants.js`: `Amber.APP_VERSION`;
    - `tests/unit-time.js`: the version assert.
 2. Update `README.md` and `docs/` if behaviour or structure changed.
-3. Run `npm run build:css` if classes changed, then `npm test`.
-4. Open a pull request. Merge only after the GitHub "Tests" check passes (GitHub Pages serves `main`).
+3. Run `npm run build:css` if classes changed, then `npm run lint` and `npm test`.
+4. Open a pull request. Merge only after the GitHub "Tests" check passes: it runs the lint and the tests (GitHub Pages serves `main`).
diff --git a/README.md b/README.md
index 069f2f5..8f6f0e5 100644
--- a/README.md
+++ b/README.md
@@ -92,8 +92,9 @@ The solar and battery planner. From the last 12 months of meter readings (Amber'
 ## For developers
 
 ```bash
-npm install          # Tailwind CLI and Playwright
+npm install          # Tailwind CLI, ESLint and Playwright
 npm run build:css    # css/input.css -> css/app.css (commit the result)
+npm run lint         # ESLint (eslint.config.js)
 npm test             # unit checks, then Playwright against a local static server
 npm run test:unit    # unit checks only
 npm run serve        # http://127.0.0.1:4173
diff --git a/docs/ARCHITECTURE.md b/docs/ARCHITECTURE.md
index 40c96bf..b0572ba 100644
--- a/docs/ARCHITECTURE.md
+++ b/docs/ARCHITECTURE.md
@@ -25,7 +25,9 @@ scripts/update-prices.js Downloads AEMO prices into data/prices (run daily by a
 scripts/update-solar.js  Downloads PVGIS weather into data/solar (run by hand)
 tests/unit-*.js          Node unit checks (no framework: assert + console)
 tests/*.spec.js          Playwright end-to-end tests (Chromium)
-.github/workflows/       test.yml (tests on PRs and main), update-prices.yml (daily price refresh)
+eslint.config.js         ESLint settings (npm run lint)
+eslint-rules/            The project's own ESLint rules (no-extra-arguments)
+.github/workflows/       test.yml (lint and tests on PRs and main), update-prices.yml (daily price refresh)
 chart.umd.min.js, chartjs-plugin-zoom.min.js, pdf.min.js, pdf.worker.min.js   Vendored libraries
 ```
 
@@ -218,9 +220,10 @@ Saved JSON is read through `storedJson` / `storedCustomPlans` in `app.js`: a val
 ## Build, test and CI
 
 - `npm run build:css` rebuilds `css/app.css`. Tailwind scans `index.html` and `js/**/*.js` for class names, and `tailwind.config.js` safelists classes that are only built dynamically. Commit `css/app.css` after changing classes.
-- **Unit checks**: `tests/unit-*.js`, run with plain `node` (`npm run test:unit`). Each prints `ok:` / `FAIL:` lines and exits non-zero on failure. `unit-planner.js` holds the parity checks: the planner's cost equals Compare's, battery energy balances, finance and ratings.
-- **End-to-end**: `tests/*.spec.js` with Playwright (Chromium) against `scripts/static-server.js` on port 4173 (`playwright.config.js`, `reuseExistingServer: true`). Tests mock Amber's API with `page.route('**/api.amber.com.au/**', …)` and build NEM12 files in code. About 54 tests take about 45 s with two workers.
-- **CI**: `.github/workflows/test.yml` runs `npm ci`, installs Chromium and runs `npm test -- --workers=2` on every pull request and on pushes to `main`. Failed runs upload `test-results/`.
+- **Lint**: `npm run lint` runs ESLint 10 with `eslint.config.js` (a flat config). The files in `js/` are checked as classic browser scripts, and the unit checks, scripts and specs as CommonJS. On top of ESLint's recommended set it reports unused variables, shadowed names, `var`, `==` and a `let` that never changes, and holds the house style (4-space indent, single quotes, semicolons, from `@stylistic/eslint-plugin`). One rule is the project's own: `local/no-extra-arguments` (`eslint-rules/no-extra-arguments.js`) reports a call that passes more arguments than the function takes, for functions and `Amber.*` functions defined in the same file. Rules are tuned to the code rather than the code restyled: the tests keep their own alignment of long asserts, and `preserve-caught-error` is off because network errors are replaced on purpose by plain messages.
+- **Unit checks**: `tests/unit-*.js`, run with plain `node` (`npm run test:unit`). Each prints `ok:` / `FAIL:` lines and exits non-zero on failure. `unit-syntax.js` runs first: it parses every `js/*.js` (no other unit script loads the DOM files such as `help.js` and `app.js`) and checks that `index.html` loads each of them once, with `app.js` last. `unit-planner.js` holds the parity checks: the planner's cost equals Compare's, battery energy balances, finance and ratings.
+- **End-to-end**: `tests/*.spec.js` with Playwright (Chromium) against `scripts/static-server.js` on port 4173 (`playwright.config.js`, `reuseExistingServer: true`). Tests mock Amber's API with `page.route('**/api.amber.com.au/**', …)` and build NEM12 files in code. About 66 tests take about a minute with two workers.
+- **CI**: `.github/workflows/test.yml` runs `npm ci`, `npm run lint`, installs Chromium and runs `npm test -- --workers=2` on every pull request and on pushes to `main`. Failed runs upload `test-results/`.
 
 ## Releases
 
@@ -228,4 +231,4 @@ Each change ships as a version:
 
 1. Bump the version in three places: `index.html` (the `<title>`, the "Version X." line in the header, and every `?v=` query string), `js/constants.js` (`Amber.APP_VERSION`), and `tests/unit-time.js` (the version assert).
 2. `npm run build:css` if classes changed; update the README and these docs if behaviour changed.
-3. Run `npm test`, open a pull request, and merge once the Tests check passes. GitHub Pages serves `main`.
+3. Run `npm run lint` and `npm test`, open a pull request, and merge once the Tests check passes. GitHub Pages serves `main`.
diff --git a/docs/FRONTEND.md b/docs/FRONTEND.md
index 3e27753..ff3945a 100644
--- a/docs/FRONTEND.md
+++ b/docs/FRONTEND.md
@@ -127,6 +127,7 @@ The app is written for everyday Australian householders:
 
 ```bash
 npm run build:css
+npm run lint
 npm test                       # or: npx playwright test tests/planner.spec.js
 npm run serve                  # then open http://127.0.0.1:4173
 ```
diff --git a/docs/REVIEW.md b/docs/REVIEW.md
index 57e6341..f7f94d1 100644
--- a/docs/REVIEW.md
+++ b/docs/REVIEW.md
@@ -7,11 +7,12 @@ Notes for anyone reviewing this codebase: what it must keep doing, where mistake
 ```bash
 npm install
 npm run build:css
-npm test            # ~10 unit scripts, then ~54 Playwright tests (~45 s with --workers=2)
+npm run lint        # ESLint
+npm test            # ~11 unit scripts, then ~66 Playwright tests (~60 s with --workers=2)
 npm run serve       # http://127.0.0.1:4173
 ```
 
-Without an Amber API key, use the "Not with Amber?" path on Start with a NEM12 file. The tests build them in code (`nem12Year()`, `nem12Battery()` in `tests/planner.spec.js`). CI runs the same `npm test` on every pull request (`.github/workflows/test.yml`).
+Without an Amber API key, use the "Not with Amber?" path on Start with a NEM12 file. The tests build them in code (`nem12Year()`, `nem12Battery()` in `tests/planner.spec.js`). CI runs `npm run lint` and the same `npm test` on every pull request (`.github/workflows/test.yml`).
 
 ## Invariants: what must stay true
 
@@ -44,7 +45,7 @@ These are the properties the tests guard and that users rely on. A change that b
 
 - **`app.js` is a monolith.** Tabs, plan form, results, imports, bill check, Free? and settings live in one IIFE sharing a `state` object. Natural seams: the plan form (`createPlanObjectFromForm`, `applyPlanTemplate`, TOU windows), results rendering, imports (CSV, NEM12, local sites), the bill check, the Free? tab and settings.
 - **HTML as strings.** Most results are template strings set with `innerHTML`, with table markup repeated (`th`/`td` helpers exist only in `planner-ui.js`). It's safe while everything is escaped, but verbose and easy to make inconsistent.
-- **No linter, formatter or type checking.** There's no ESLint or Prettier config; the style is 4-space indentation, single quotes and semicolons. JSDoc comments exist on many engine functions but not throughout.
+- **No formatter or type checking.** ESLint (`npm run lint`, run in CI) catches unused and shadowed variables, undefined names and calls with too many arguments within a file, and holds the style (4-space indentation, single quotes, semicolons). There's no Prettier, and nothing checks types or calls between files. JSDoc comments exist on many engine functions but not throughout.
 - **Home-made unit test harness.** `tests/unit-*.js` use their own `assert` and print `ok:`/`FAIL:`. They work, but give no per-test isolation or coverage.
 - **End-to-end tests depend on IDs and wording.** Many assertions match visible text, so copy edits need test edits too.
 - **Yearly maintenance is manual.** Each 1 July: the default offers and VDO in `templates.js`, Amber's network tariffs in `networks.js` (FY2026-27 today), Amber's default fixed charges and `AMBER_RATES_CHANGE_DATE` in `constants.js`, rebate and hardware defaults in `PLANNER_FINANCE_DEFAULTS`, and `TEMPLATES_AS_AT`. Market offers drift during the year.
@@ -57,7 +58,7 @@ These are the properties the tests guard and that users rely on. A change that b
 
 1. Is it worth splitting `app.js` along the seams above before a frontend refresh, so the refresh doesn't have to touch pricing code?
 2. Should HTML building move to small render helpers (or `<template>` elements in `index.html`) to cut repetition, while staying build-free and within the CSP?
-3. Would a lint/format setup (ESLint + Prettier, run in CI) be welcome, given the no-build constraint?
+3. ESLint now runs in CI. Would a formatter (Prettier) or type checking of the JSDoc (`tsc --checkJs`) be welcome too, given the no-build constraint?
 4. Is the planner's battery heuristic good enough, or should it be compared against a simple linear-programming optimum for a few test days to measure how optimistic it is?
 5. Should the Solar+? search move to a Web Worker (it runs on the main thread today, yielding with `setTimeout(0)`)? The CSP already allows `worker-src 'self'`.
 6. Should the app say explicitly that it's independent of Amber Electric (see FRONTEND.md)?
@@ -67,6 +68,7 @@ These are the properties the tests guard and that users rely on. A change that b
 
 | Test | Covers |
 |---|---|
+| `unit-syntax.js` | Every `js/*.js` parses as a classic script; `index.html` loads each one once, `app.js` last |
 | `unit-time.js` | Dates, NEM vs local time, TOU windows, app version |
 | `unit-bill.js`, `unit-billcheck.js` | Bill reading and line-by-line checks |
 | `unit-stats.js` | More Stats |
diff --git a/eslint-rules/no-extra-arguments.js b/eslint-rules/no-extra-arguments.js
new file mode 100644
index 0000000..45e1203
--- /dev/null
+++ b/eslint-rules/no-extra-arguments.js
@@ -0,0 +1,104 @@
+'use strict';
+
+/*
+ * A local ESLint rule: a call that passes more arguments than the function takes. JavaScript
+ * drops the extras silently, so they are usually a leftover from an older signature (or a sign
+ * that the caller expects something the function doesn't do).
+ *
+ * It only looks at calls it can be sure about, inside one file:
+ *   - a function declared in that file (`function f(a) {}` or `const f = (a) => {}`), called as `f(…)`;
+ *   - a function put on the namespace in that file (`Amber.f = function (a) {}`), called as `Amber.f(…)`.
+ * Functions that take `...rest` or read `arguments` are left alone, and so are calls with `...spread`.
+ */
+
+function isFunction(node) {
+    return !!node && (node.type === 'FunctionDeclaration' || node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression');
+}
+
+module.exports = {
+    meta: {
+        type: 'problem',
+        docs: { description: 'disallow calling a function with more arguments than it takes' },
+        schema: [{
+            type: 'object',
+            properties: { namespaces: { type: 'array', items: { type: 'string' } } },
+            additionalProperties: false
+        }],
+        messages: {
+            extra: '\'{{name}}\' takes {{takes}} argument{{s}} but is called with {{given}}.'
+        }
+    },
+    create(context) {
+        const sourceCode = context.sourceCode;
+        const namespaces = new Set((context.options[0] && context.options[0].namespaces) || []);
+        const members = new Map();      // 'Amber.name' -> function node, or null when assigned twice
+        const memberCalls = [];
+
+        /** How many arguments the function takes, or null when it takes any number. */
+        function arity(fn) {
+            if (fn.params.some((p) => p.type === 'RestElement')) return null;
+            if (fn.type !== 'ArrowFunctionExpression') {
+                const scope = sourceCode.scopeManager.acquire(fn);
+                const args = scope && scope.set.get('arguments');
+                if (args && args.references.length) return null;
+            }
+            return fn.params.length;
+        }
+
+        /** The one function a name always refers to, or null when that can't be known. */
+        function localFunction(node) {
+            let scope = sourceCode.getScope(node);
+            let variable = null;
+            while (scope && !variable) {
+                variable = scope.set.get(node.name) || null;
+                scope = scope.upper;
+            }
+            if (!variable || variable.defs.length !== 1) return null;
+            const def = variable.defs[0];
+            if (variable.references.some((ref) => ref.isWrite() && !ref.init)) return null;
+            if (def.type === 'FunctionName' && def.node.type === 'FunctionDeclaration') return def.node;
+            if (def.type === 'Variable' && def.node.id.type === 'Identifier' && isFunction(def.node.init)) return def.node.init;
+            return null;
+        }
+
+        function memberName(node) {
+            if (node.type !== 'MemberExpression' || node.computed) return null;
+            if (node.object.type !== 'Identifier' || !namespaces.has(node.object.name)) return null;
+            return `${node.object.name}.${node.property.name}`;
+        }
+
+        function check(call, fn, name) {
+            if (call.arguments.some((a) => a.type === 'SpreadElement')) return;
+            const takes = arity(fn);
+            if (takes == null || call.arguments.length <= takes) return;
+            context.report({
+                node: call.arguments[takes],
+                messageId: 'extra',
+                data: { name, takes, s: takes === 1 ? '' : 's', given: call.arguments.length }
+            });
+        }
+
+        return {
+            AssignmentExpression(node) {
+                const name = memberName(node.left);
+                if (!name) return;
+                members.set(name, members.has(name) || node.operator !== '=' || !isFunction(node.right) ? null : node.right);
+            },
+            CallExpression(node) {
+                if (node.callee.type === 'Identifier') {
+                    const fn = localFunction(node.callee);
+                    if (fn) check(node, fn, node.callee.name);
+                    return;
+                }
+                const name = memberName(node.callee);
+                if (name) memberCalls.push({ node, name });
+            },
+            'Program:exit'() {
+                memberCalls.forEach(({ node, name }) => {
+                    const fn = members.get(name);
+                    if (fn) check(node, fn, name);
+                });
+            }
+        };
+    }
+};
diff --git a/eslint.config.js b/eslint.config.js
new file mode 100644
index 0000000..82a1922
--- /dev/null
+++ b/eslint.config.js
@@ -0,0 +1,83 @@
+'use strict';
+
+/*
+ * ESLint for the code as it is: classic browser scripts (each js/*.js is an IIFE adding to
+ * window.Amber, no modules, no build step), Node unit checks and scripts, and Playwright specs.
+ * It looks for real problems (unused or shadowed variables, unreachable code, undefined names)
+ * and holds the house style: 4-space indent, single quotes, semicolons. Run: npm run lint
+ */
+const js = require('@eslint/js');
+const globals = require('globals');
+const stylistic = require('@stylistic/eslint-plugin');
+const noExtraArguments = require('./eslint-rules/no-extra-arguments.js');
+
+// The project's own rules (eslint-rules/).
+const local = { rules: { 'no-extra-arguments': noExtraArguments } };
+
+const rules = {
+    ...js.configs.recommended.rules,
+    'no-unused-vars': ['error', { args: 'after-used', caughtErrors: 'none' }],
+    'no-shadow': ['error', { builtinGlobals: false, hoist: 'functions' }],
+    'no-unreachable': 'error',
+    'local/no-extra-arguments': ['error', { namespaces: ['Amber'] }],
+    // An error caught from the network is replaced on purpose by a plain message for the householder.
+    'preserve-caught-error': 'off',
+    'no-var': 'error',
+    'prefer-const': ['error', { destructuring: 'all' }],
+    eqeqeq: ['error', 'always', { null: 'ignore' }],
+    '@stylistic/indent': ['error', 4, { SwitchCase: 1 }],
+    '@stylistic/quotes': ['error', 'single', { avoidEscape: true, allowTemplateLiterals: 'always' }],
+    '@stylistic/semi': ['error', 'always']
+};
+
+module.exports = [
+    {
+        // Vendored libraries, built CSS and data are not ours to lint.
+        ignores: ['node_modules/**', '*.min.js', 'css/**', 'data/**', 'test-results/**', 'playwright-report/**']
+    },
+    {
+        files: ['**/*.js'],
+        plugins: { '@stylistic': stylistic, local },
+        linterOptions: { reportUnusedDisableDirectives: 'error' },
+        rules
+    },
+    {
+        // The app: classic scripts sharing window.Amber. The same files are `require`d by the Node
+        // unit checks, hence `module` and `globalThis`. Chart and pdfjsLib are the vendored libraries.
+        files: ['js/**/*.js'],
+        languageOptions: {
+            ecmaVersion: 2022,
+            sourceType: 'script',
+            globals: {
+                ...globals.browser,
+                Chart: 'readonly',
+                pdfjsLib: 'readonly',
+                module: 'readonly'
+            }
+        }
+    },
+    {
+        files: ['tests/unit-*.js', 'scripts/**/*.js', 'eslint-rules/**/*.js', '*.config.js'],
+        languageOptions: {
+            ecmaVersion: 2022,
+            sourceType: 'commonjs',
+            globals: { ...globals.node }
+        }
+    },
+    {
+        // Playwright specs run in Node, with page.evaluate callbacks that run in the page.
+        files: ['tests/**/*.spec.js'],
+        languageOptions: {
+            ecmaVersion: 2022,
+            sourceType: 'commonjs',
+            globals: { ...globals.node, ...globals.browser, Amber: 'readonly', Chart: 'readonly' }
+        }
+    },
+    {
+        // The tests line up long assert conditions and tables of cases their own way.
+        files: ['tests/**/*.js'],
+        rules: {
+            '@stylistic/indent': ['error', 4, { SwitchCase: 1, ArrayExpression: 'off', CallExpression: { arguments: 'off' } }]
+        }
+    }
+];
diff --git a/index.html b/index.html
index 163ecb6..de111a5 100644
--- a/index.html
+++ b/index.html
@@ -4,9 +4,9 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <meta http-equiv="Content-Security-Policy" content="default-src 'self'; script-src 'self'; style-src 'self'; connect-src 'self' https://api.amber.com.au; img-src 'self' data:; font-src 'self'; worker-src 'self'; base-uri 'self'; form-action 'self'">
-    <title>Amber Compare &amp; Export v1.62</title>
+    <title>Amber Compare &amp; Export v1.63</title>
     <link rel="icon" href="favicon.ico" type="image/x-icon">
-    <link rel="stylesheet" href="css/app.css?v=1.62">
+    <link rel="stylesheet" href="css/app.css?v=1.63">
 </head>
 <body class="bg-gray-100 text-gray-800">
     <a href="#mainTabs" class="sr-only focus:not-sr-only focus:absolute focus:top-2 focus:left-2 focus:z-50 focus:bg-white focus:px-3 focus:py-2 focus:rounded">Skip to the tabs</a>
@@ -19,7 +19,7 @@ <h1 class="text-2xl sm:text-3xl font-bold text-gray-900 flex items-center">
                         <img src="favicon.ico" alt="" class="mr-3 h-12 w-12 sm:h-14 sm:w-14"> Amber Compare &amp; Export
                     </h1>
                     <p class="mt-2 text-gray-600">See what your electricity really costs on Amber, check an Amber bill, and find out whether another plan (or Amber) would be cheaper for you.</p>
-                    <p class="mt-1 text-xs text-gray-500">Free and private: everything runs in this browser and nothing is uploaded. Version 1.62.</p>
+                    <p class="mt-1 text-xs text-gray-500">Free and private: everything runs in this browser and nothing is uploaded. Version 1.63.</p>
                 </div>
                 <div class="relative flex items-center">
                     <button id="settingsBtn" type="button" aria-label="Settings" aria-haspopup="true" aria-expanded="false" class="p-2 rounded-full text-gray-500 hover:bg-gray-100 hover:text-gray-700 focus:outline-none focus:ring-2 focus:ring-offset-2 focus:ring-indigo-500">
@@ -797,26 +797,26 @@ <h3 class="text-xl font-bold text-gray-900 mb-1" data-help="planPayback">Paying
 
     <script src="chart.umd.min.js"></script>
     <script src="chartjs-plugin-zoom.min.js"></script>
-    <script src="js/constants.js?v=1.62"></script>
-    <script src="js/help.js?v=1.62"></script>
-    <script src="js/time.js?v=1.62"></script>
-    <script src="js/templates.js?v=1.62"></script>
-    <script src="js/storage.js?v=1.62"></script>
-    <script src="js/costs.js?v=1.62"></script>
-    <script src="js/api.js?v=1.62"></script>
-    <script src="js/bill.js?v=1.62"></script>
-    <script src="js/csv.js?v=1.62"></script>
-    <script src="js/charts.js?v=1.62"></script>
-    <script src="js/calendar.js?v=1.62"></script>
-    <script src="js/stats.js?v=1.62"></script>
-    <script src="js/monthly.js?v=1.62"></script>
-    <script src="js/redispatch.js?v=1.62"></script>
-    <script src="js/import.js?v=1.62"></script>
-    <script src="js/networks.js?v=1.62"></script>
-    <script src="js/estimate.js?v=1.62"></script>
-    <script src="js/solar.js?v=1.62"></script>
-    <script src="js/planner.js?v=1.62"></script>
-    <script src="js/planner-ui.js?v=1.62"></script>
-    <script src="js/app.js?v=1.62"></script>
+    <script src="js/constants.js?v=1.63"></script>
+    <script src="js/help.js?v=1.63"></script>
+    <script src="js/time.js?v=1.63"></script>
+    <script src="js/templates.js?v=1.63"></script>
+    <script src="js/storage.js?v=1.63"></script>
+    <script src="js/costs.js?v=1.63"></script>
+    <script src="js/api.js?v=1.63"></script>
+    <script src="js/bill.js?v=1.63"></script>
+    <script src="js/csv.js?v=1.63"></script>
+    <script src="js/charts.js?v=1.63"></script>
+    <script src="js/calendar.js?v=1.63"></script>
+    <script src="js/stats.js?v=1.63"></script>
+    <script src="js/monthly.js?v=1.63"></script>
+    <script src="js/redispatch.js?v=1.63"></script>
+    <script src="js/import.js?v=1.63"></script>
+    <script src="js/networks.js?v=1.63"></script>
+    <script src="js/estimate.js?v=1.63"></script>
+    <script src="js/solar.js?v=1.63"></script>
+    <script src="js/planner.js?v=1.63"></script>
+    <script src="js/planner-ui.js?v=1.63"></script>
+    <script src="js/app.js?v=1.63"></script>
 </body>
 </html>
diff --git a/js/app.js b/js/app.js
index 555afae..659b9ae 100644
--- a/js/app.js
+++ b/js/app.js
@@ -83,7 +83,7 @@
     /** Fill Setup's Amber charges from storage (the Amber account's own charges). */
     function loadAmberChargeFields() {
         let storedConn = localStorage.getItem('amberConnectionRate');
-        let storedSub = localStorage.getItem('amberSubscriptionRate');
+        const storedSub = localStorage.getItem('amberSubscriptionRate');
         let storedDemand = localStorage.getItem('amberDemandRate');
         const storedPrev = ['amberConnectionRatePrev', 'amberSubscriptionRatePrev', 'amberDemandRatePrev'].map((id) => localStorage.getItem(id));
         // Before v1.40 there was one set of charges; the old defaults (and bills that matched them)
@@ -1237,7 +1237,7 @@
         const selector = $('daySelector');
         selector.innerHTML = '';
         const datesArray = [];
-        let currentDate = new Date(startDateStr + 'T00:00:00');
+        const currentDate = new Date(startDateStr + 'T00:00:00');
         const end = new Date(endDateStr + 'T00:00:00');
         while (currentDate <= end) {
             datesArray.push(Amber.formatForInput(currentDate));
@@ -1286,7 +1286,6 @@
         }).join('');
     }
 
-    /** "$12.34" / "−$6.45" (proper minus sign before the dollar sign). */
     // Plain names for meter channels.
     function channelName(c) {
         if (c.type === 'feedIn') return 'Solar sent out';
@@ -1294,12 +1293,12 @@
         return 'Power bought';
     }
 
-    function money(v) {
-        const n = Number(v) || 0;
-        return `${n < -0.004 ? '−' : ''}$${Math.abs(n).toFixed(2)}`;
-    }
-
     async function displayResults(channelTotals, startDateStr, endDateStr, numDays, demandTariffInfo, otherDemandTariffInfo, skipGraphs) {
+        // "$12.34" / "−$6.45" (proper minus sign before the dollar sign).
+        const money = (v) => {
+            const n = Number(v) || 0;
+            return `${n < -0.004 ? '−' : ''}$${Math.abs(n).toFixed(2)}`;
+        };
         const planName = $('planName').value.trim() || 'your plan';
         const period = `(${fmtDate(startDateStr)} to ${fmtDate(endDateStr)})`;
         const rates = readAmberRates();
@@ -1405,7 +1404,7 @@
                 <td class="px-3 py-3 whitespace-nowrap text-sm text-gray-500 text-right">
                     <div class="text-xs">Busiest: ${maxDemandKw} kW</div>
                     <div class="text-xs text-blue-600 font-normal">on ${maxDemandDateTime}</div>
-                    ${demandMonthsHtml(demandTariffInfo.months, 'demandDays') || `<div class="text-xs">× ${demandTariffInfo.demandDays} days</div>`}
+                    ${demandMonthsHtml(demandTariffInfo.months) || `<div class="text-xs">× ${demandTariffInfo.demandDays} days</div>`}
                 </td>
                 <td class="px-3 py-3 whitespace-nowrap text-sm text-gray-900 text-right">${money(adjustedDemandCost)}</td>
                 <td class="px-3 py-3 whitespace-nowrap text-sm text-gray-500"></td>
@@ -1423,7 +1422,7 @@
                 <td class="px-3 py-3 whitespace-nowrap text-sm text-gray-500 text-right">
                     <div class="text-xs">Busiest: ${maxDemandKw} kW</div>
                     <div class="text-xs text-blue-600 font-normal">${Amber.escapeHTML(String(maxDemandDateTime))}</div>
-                    ${demandMonthsHtml(otherDemandTariffInfo.months, 'applicableDaysCount') || `<div class="text-xs">× ${dayCount} applicable days</div>`}
+                    ${demandMonthsHtml(otherDemandTariffInfo.months) || `<div class="text-xs">× ${dayCount} applicable days</div>`}
                 </td>
                 <td class="px-3 py-3 whitespace-nowrap text-sm text-gray-900"></td>
                 <td class="px-3 py-3 whitespace-nowrap text-sm text-gray-500 text-right">${money(adjustedOtherDemandCost)}</td>
diff --git a/js/calendar.js b/js/calendar.js
index 47e9bd6..8f05676 100644
--- a/js/calendar.js
+++ b/js/calendar.js
@@ -48,7 +48,7 @@
 
     function channelRowsHtml(channels) {
         let html = '';
-        Object.entries(channels).forEach(([id, data]) => {
+        Object.values(channels).forEach((data) => {
             if (Math.abs(data.amberCost) > 0.001 || Math.abs(data.otherCost) > 0.001 || Math.abs(data.kwh) > 0.01) {
                 html += `<tr>
                     <td class="px-2 py-1 whitespace-nowrap">${data.type === 'feedIn' ? 'Solar sent out' : (data.type === 'controlledLoad' ? 'Hot water' : 'Power bought')}</td>
@@ -254,7 +254,7 @@
             allMonthlyTotals[monthKey].outKwh += summary.totalOutKwh;
         });
 
-        let date = new Date(start.getFullYear(), start.getMonth(), 1);
+        const date = new Date(start.getFullYear(), start.getMonth(), 1);
         const lastDay = new Date(end.getFullYear(), end.getMonth() + 1, 0);
         let currentMonth = -1;
         let monthGrid;
diff --git a/js/constants.js b/js/constants.js
index 63a0264..837a178 100644
--- a/js/constants.js
+++ b/js/constants.js
@@ -20,7 +20,7 @@
     // Compare "This month" when the page opens with a saved API key (a test can preset
     // window.Amber.AUTO_COMPARE = false to start idle).
     Amber.AUTO_COMPARE = Amber.AUTO_COMPARE !== false;
-    Amber.APP_VERSION = '1.62';
+    Amber.APP_VERSION = '1.63';
     Amber.TEMPLATES_AS_AT = '2026-07-01';
     // All editable rates (plans, custom, Amber fixed charges) are GST-inclusive,
     // matching Energy Made Easy, DMO/VDO, retailer fact sheets and Amber perKwh.
diff --git a/js/costs.js b/js/costs.js
index 85c7e14..b79d344 100644
--- a/js/costs.js
+++ b/js/costs.js
@@ -126,7 +126,6 @@
         };
         (channel.usageData || []).forEach((item) => {
             const kwh = Amber.absKwh(item.kwh);
-            const perKwh = parseFloat(item.perKwh) || 0;
             const splits = capped && capped.get(item);
             if (splits) {
                 splits.forEach((s) => {
@@ -490,7 +489,7 @@
         if (maxDemandKwh === 0) return empty;
 
         let applicableDaysCount = 0;
-        let currentDate = new Date(startDateStr + 'T00:00:00');
+        const currentDate = new Date(startDateStr + 'T00:00:00');
         const endDate = new Date(endDateStr + 'T00:00:00');
         while (currentDate <= endDate) {
             if (demandDays.includes(currentDate.getDay())) applicableDaysCount++;
@@ -577,11 +576,6 @@
         const numDays = opts.numDays;
         const state = opts.state;
         const gstInclusive = opts.gstInclusive !== false;
-        const amberRates = opts.amberRates || {
-            connectionCents: Amber.DEFAULT_AMBER_CONNECTION_CENTS,
-            subscriptionCents: Amber.DEFAULT_AMBER_SUBSCRIPTION_CENTS,
-            demandCents: Amber.DEFAULT_AMBER_DEMAND_CENTS
-        };
 
         const temp = Amber.shallowChannelCopy(channelTotals);
         Amber.calculateOtherSupplierCosts(temp, planConfig, state);
@@ -634,7 +628,6 @@
                 if (!summaries[dateStr]) return;
 
                 const kwh = Amber.absKwh(item.kwh);
-                const perKwh = parseFloat(item.perKwh) || 0;
                 const amberItemCost = Amber.settledFeedInItemCost(channel, item);
                 const otherItemCost = Amber.otherItemCostCents(item, channel.type, planConfig, state, capped) / 100;
 
@@ -734,7 +727,7 @@
                 });
             }
 
-            let loopDate = new Date(monthStartDate);
+            const loopDate = new Date(monthStartDate);
             while (loopDate <= monthEndDate) {
                 const dateStr = Amber.formatForInput(loopDate);
                 if (summaries[dateStr]) {
diff --git a/js/estimate.js b/js/estimate.js
index 700bef5..870c37d 100644
--- a/js/estimate.js
+++ b/js/estimate.js
@@ -32,7 +32,7 @@
      */
     Amber.parseNem12 = function (text) {
         const out = { ok: false, error: null, nmis: {}, nmi: null, skipped: 0 };
-        const src = String(text || '').replace(/^/, '');
+        const src = String(text || '').replace(/^\uFEFF/, '');
         const hasHeader = /(^|\n)\s*"?100"?,\s*"?NEM12/i.test(src);
         if (!hasHeader && !(ROW_200.test(src) && ROW_300.test(src))) {
             out.error = 'This doesn\'t look like a NEM12 file (it should start with a 100,NEM12 row). Ask the retailer or network for your interval data in NEM12 format.';
diff --git a/js/import.js b/js/import.js
index 08c9c9d..a2a4728 100644
--- a/js/import.js
+++ b/js/import.js
@@ -83,8 +83,8 @@
      */
     Amber.parseAmberUsageCsv = function (text) {
         const out = { ok: false, error: null, rows: 0, channels: {}, byDate: {}, days: [], firstDay: null, lastDay: null, intervalMinutes: null };
-        const src = String(text || '').replace(/^/, '');
-        let pos = src.indexOf('\n');
+        const src = String(text || '').replace(/^\uFEFF/, '');
+        const pos = src.indexOf('\n');
         const headerLine = (pos === -1 ? src : src.substring(0, pos)).replace(/\r$/, '');
         const header = splitCsvLine(headerLine).map((h) => h.trim().toLowerCase());
         const col = (name) => header.indexOf(name);
diff --git a/js/planner-ui.js b/js/planner-ui.js
index b1c57dc..1183504 100644
--- a/js/planner-ui.js
+++ b/js/planner-ui.js
@@ -229,7 +229,7 @@
                 const exportCode = (site.estimate && site.estimate.exportCode)
                     || (feedIn && net.exportTariffs && net.exportTariffs[feedIn.tariff] ? feedIn.tariff : '')
                     || net.defaultExport || '';
-                let prices = null;
+                let prices;
                 try { prices = await Amber.loadRegionPrices(net.region, Amber.priceMonthsFor(year.first, year.last)); } catch (e) { prices = null; }
                 Amber.fillPlannerExportPrices(year, { net, exportCode, prices });
             } else {
@@ -281,8 +281,8 @@
         $('planRetailersPanel').addEventListener('change', retailerChange);
         $('planRetailersPanel').addEventListener('click', retailerButtons);
         document.addEventListener('click', (e) => {
-            const d = $('planRetailers');
-            if (d.open && !d.contains(e.target)) d.open = false;
+            const box = $('planRetailers');
+            if (box.open && !box.contains(e.target)) box.open = false;
         });
         $('planRetailers').addEventListener('keydown', (e) => {
             if (e.key === 'Escape' && $('planRetailers').open) {
@@ -796,7 +796,6 @@
         const k = (v) => Math.round(v).toLocaleString('en-AU');
         const gap = c.readings.bill !== 0 ? (c.modelled.bill - c.readings.bill) / Math.abs(c.readings.bill) : 0;
         const close = Math.abs(gap) <= 0.1;
-        const th = (t, right) => `<th scope="col" class="px-2 py-2 ${right ? 'text-right' : 'text-left'} text-xs font-medium text-gray-500 uppercase tracking-wider">${t}</th>`;
         const row = (name, f) => `<tr><td class="px-2 py-2">${name}</td><td class="px-2 py-2 text-right whitespace-nowrap">${f(c.readings)}</td><td class="px-2 py-2 text-right whitespace-nowrap">${f(c.modelled)}</td><td class="px-2 py-2 text-right whitespace-nowrap">${f(c.without)}</td></tr>`;
         const sources = [];
         if (st.fromSolar > 1) sources.push(`${k(st.fromSolar)} kWh of your solar`);
diff --git a/js/planner.js b/js/planner.js
index 542c351..f9b983b 100644
--- a/js/planner.js
+++ b/js/planner.js
@@ -69,7 +69,7 @@
             amberImp: new Float64Array(n), amberCl: new Float64Array(n), amberExp: new Float64Array(n).fill(NaN),
             demandFlag: new Uint8Array(n), hasFeedIn: false, hasCl: false, parts: Object.create(null)
         };
-        const sum = { imp: new Float64Array(n), cl: new Float64Array(n), exp: new Float64Array(n) };
+        const weighted = { imp: new Float64Array(n), cl: new Float64Array(n), exp: new Float64Array(n) };
         const plain = { imp: new Float64Array(n), cl: new Float64Array(n), exp: new Float64Array(n) };
         const count = { imp: new Uint16Array(n), cl: new Uint16Array(n), exp: new Uint16Array(n) };
         const key = { general: 'imp', controlledLoad: 'cl', feedIn: 'exp' };
@@ -95,7 +95,7 @@
                 const price = parseFloat(item.perKwh);
                 y[k][i] += kwh;
                 if (Number.isFinite(price)) {
-                    sum[k][i] += price * kwh;
+                    weighted[k][i] += price * kwh;
                     plain[k][i] += price;
                     count[k][i] += 1;
                 }
@@ -106,7 +106,7 @@
         });
         const price = (k, i) => {
             if (!count[k][i]) return NaN;
-            return y[k][i] > 0 ? sum[k][i] / y[k][i] : plain[k][i] / count[k][i];
+            return y[k][i] > 0 ? weighted[k][i] / y[k][i] : plain[k][i] / count[k][i];
         };
         for (let i = 0; i < n; i++) {
             y.amberImp[i] = price('imp', i);
@@ -950,7 +950,6 @@
      */
     Amber.simulateBattery = function (year, flows, prices, battery) {
         const B = battery && battery.kwh > 0 ? battery.kwh : 0;
-        const n = year.n;
         const imp = Float64Array.from(flows.imp);
         const exp = Float64Array.from(flows.exp);
         const out = { imp, exp, charged: 0, gridCharged: 0, discharged: 0, exported: 0, curtailed: 0, limited: 0, cycles: 0 };
diff --git a/js/redispatch.js b/js/redispatch.js
index 9759262..d95d1b6 100644
--- a/js/redispatch.js
+++ b/js/redispatch.js
@@ -246,6 +246,7 @@
                 const x = Math.min(exportRoom, budget, room * rte);
                 if (x > 0) {
                     extraExport = x;
+                    // eslint-disable-next-line no-useless-assignment -- keeps the tally right for any step added after this one
                     exportRoom -= x;
                     budget -= x;
                     room -= x / rte;
diff --git a/package-lock.json b/package-lock.json
index 8910e2b..f0326ca 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6,7 +6,11 @@
     "": {
       "name": "amber-compare-export",
       "devDependencies": {
+        "@eslint/js": "^10.0.1",
         "@playwright/test": "^1.55.0",
+        "@stylistic/eslint-plugin": "^5.10.0",
+        "eslint": "^10.14.0",
+        "globals": "^17.14.0",
         "tailwindcss": "^3.4.17"
       }
     },
@@ -23,6 +27,224 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/@cacheable/memory": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/@cacheable/memory/-/memory-2.2.0.tgz",
+      "integrity": "sha512-CTLKqLItRCEixEAewD3/j9DB3/o96gpTPD4eJ1v+DGOlxZRZncRQkGYqqnAGCscYd6RNeXfGeiuCphsPtqyIfQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@cacheable/utils": "^2.5.0",
+        "@keyv/bigmap": "^1.3.1",
+        "hookified": "^1.15.1",
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@cacheable/utils": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/@cacheable/utils/-/utils-2.5.0.tgz",
+      "integrity": "sha512-buipgOVDkkPXNR5+xBpDw7Zk2n1EvU7qBJCNUcL7rhQ//kfpOXPAvQ511Os0vpLYJ1pZnvudNytkQt2hst3wqA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "hashery": "^1.5.1",
+        "keyv": "^5.6.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils": {
+      "version": "4.10.1",
+      "resolved": "https://registry.npmjs.org/@eslint-community/eslint-utils/-/eslint-utils-4.10.1.tgz",
+      "integrity": "sha512-cuadcxVFE8sDK6iWJbs8Sn0av2Nrh2QSGQhVlBW9AaAHqHwjWsZHT8LJ4hFGPh7ASBV2deFdM7H/DPjulmh8rg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "eslint-visitor-keys": "^3.4.3"
+      },
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      },
+      "peerDependencies": {
+        "eslint": "^6.0.0 || ^7.0.0 || >=8.0.0"
+      }
+    },
+    "node_modules/@eslint-community/eslint-utils/node_modules/eslint-visitor-keys": {
+      "version": "3.4.3",
+      "resolved": "https://registry.npmjs.org/eslint-visitor-keys/-/eslint-visitor-keys-3.4.3.tgz",
+      "integrity": "sha512-wpc+LXeiyiisxPlEkUzU6svyS1frIO3Mgxj1fdy7Pm8Ygzguax2N3Fa/D/ag1WqbOprdI+uY6wMUl8/a2G+iag==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^12.22.0 || ^14.17.0 || >=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/eslint"
+      }
+    },
+    "node_modules/@eslint-community/regexpp": {
+      "version": "4.12.3",
+      "resolved": "https://registry.npmjs.org/@eslint-community/regexpp/-/regexpp-4.12.3.tgz",
+      "integrity": "sha512-R76UKbvsqI68DJJVTVyqFKqU98CN4+B+acxNfEA2IFarSzP0SjtKf/3+fFiXzTyv5Fj3PxLkGHe2wnVWWMxobQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^12.0.0 || ^14.0.0 || >=16.0.0"
+      }
+    },
+    "node_modules/@eslint/config-array": {
+      "version": "0.23.5",
+      "resolved": "https://registry.npmjs.org/@eslint/config-array/-/config-array-0.23.5.tgz",
+      "integrity": "sha512-Y3kKLvC1dvTOT+oGlqNQ1XLqK6D1HU2YXPc52NmAlJZbMMWDzGYXMiPRJ8TYD39muD/OTjlZmNJ4ib7dvSrMBA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/object-schema": "^3.0.5",
+        "debug": "^4.3.1",
+        "minimatch": "^10.2.4"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@eslint/config-helpers": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/@eslint/config-helpers/-/config-helpers-0.7.0.tgz",
+      "integrity": "sha512-DObd/KKUsU+FaFv4PLxSRenpXfQWmPXXP3pPZ6/K1PCrMu2vQpMDMuQe/BqYeoLcz8ro0bVDF1RxOJgfVEdhUw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^1.2.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@eslint/core": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/@eslint/core/-/core-1.2.1.tgz",
+      "integrity": "sha512-MwcE1P+AZ4C6DWlpin/OmOA54mmIZ/+xZuJiQd4SyB29oAJjN30UW9wkKNptW2ctp4cEsvhlLY/CsQ1uoHDloQ==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@types/json-schema": "^7.0.15"
+      },
+      "engines": {
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+      }
+    },
+    "node_modules/@eslint/js": {
+      "version": "10.0.1",
+      "resolved": "https://registry.npmjs.org/@eslint/js/-/js-10.0.1.tgz",
+      "integrity": "sha512-zeR9k5pd4gxjZ0abRoIaxdc7I3nDktoXZk2qOv9gCNWx3mVwEn32VRhyLaRsDiJjTs0xq/T8mfPtyuXu7GWBcA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      },
+      "funding": {
+        "url": "https://eslint.org/donate"
+      },
+      "peerDependencies": {
+        "eslint": "^10.0.0"
+      },
+      "peerDependenciesMeta": {
+        "eslint": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@eslint/object-schema": {
+      "version": "3.0.5",
+      "resolved": "https://registry.npmjs.org/@eslint/object-schema/-/object-schema-3.0.5.tgz",
+      "integrity": "sha512-vqTaUEgxzm+YDSdElad6PiRoX4t8VGDjCtt05zn4nU810UIx/uNEV7/lZJ6KwFThKZOzOxzXy48da+No7HZaMw==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@eslint/plugin-kit": {
+      "version": "0.7.3",
+      "resolved": "https://registry.npmjs.org/@eslint/plugin-kit/-/plugin-kit-0.7.3.tgz",
+      "integrity": "sha512-IkO+/KEUvwbVpiURZg+P7zF74z5Jxe0UgJxVni+RtoHQ6IZieXaO02kmadomap/q+l6bc/jdPGGqTjhuZnuz1Q==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@eslint/core": "^1.2.1",
+        "levn": "^0.4.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.13.0 || >=24"
+      }
+    },
+    "node_modules/@humanfs/core": {
+      "version": "0.19.2",
+      "resolved": "https://registry.npmjs.org/@humanfs/core/-/core-0.19.2.tgz",
+      "integrity": "sha512-UhXNm+CFMWcbChXywFwkmhqjs3PRCmcSa/hfBgLIb7oQ5HNb1wS0icWsGtSAUNgefHeI+eBrA8I1fxmbHsGdvA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@humanfs/types": "^0.15.0"
+      },
+      "engines": {
+        "node": ">=18.18.0"
+      }
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+    "node_modules/@humanfs/node": {
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+      }
+    },
+    "node_modules/path-key": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/path-key/-/path-key-3.1.1.tgz",
+      "integrity": "sha512-ojmeN0qd+y0jszEtoY48r0Peq5dwMEkIlCOu6Q5f41lfkswXuKtYrhgoTpLnyIcHm24Uhqx+5Tqm2InSwLhE6Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/path-parse": {
       "version": "1.0.7",
       "resolved": "https://registry.npmjs.org/path-parse/-/path-parse-1.0.7.tgz",
@@ -778,6 +1690,46 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/prelude-ls": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.2.1.tgz",
+      "integrity": "sha512-vkcDPrRZo1QZLbn5RLGPpg/WmIQ65qoWWhcGKf/b5eplkkarX0m9z8ppCat4mlOqUsWpyNuYgO3VRyrYHSzX5g==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/qified": {
+      "version": "0.10.1",
+      "resolved": "https://registry.npmjs.org/qified/-/qified-0.10.1.tgz",
+      "integrity": "sha512-+Owyggi9IxT1ePKGafcI87ubSmxol6smwJ+RAHDQlx9+9cPwFWDiKFFCPuWhr9ignlGpZ9vDQLw67N4dcTVFEA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "hookified": "^2.1.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/qified/node_modules/hookified": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/hookified/-/hookified-2.2.0.tgz",
+      "integrity": "sha512-p/LgFzRN5FeoD3DLS6bkUapeye6E4SI6yJs6KetENd18S+FBthqYq2amJUWpt5z0EQwwHemidjY5OqJGEKm5uA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/queue-microtask": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/queue-microtask/-/queue-microtask-1.2.3.tgz",
@@ -876,6 +1828,29 @@
         "queue-microtask": "^1.2.2"
       }
     },
+    "node_modules/shebang-command": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
+      "integrity": "sha512-kHxr2zZpYtdmrN1qDjrrX/Z1rR1kG8Dx+gkpK1G4eXmvXswmcE1hTWBWYUzlraYw1/yZp6YuDY77YtvbN0dmDA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "shebang-regex": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/shebang-regex": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/shebang-regex/-/shebang-regex-3.0.0.tgz",
+      "integrity": "sha512-7++dFhtcx3353uBaq8DDR4NuxBetBzC7ZQOhmTQInHEd6bSrXdiEyzCvG07Z44UYdLShWUyXt5M/yhz8ekcb1A==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -1051,12 +2026,74 @@
       "dev": true,
       "license": "Apache-2.0"
     },
+    "node_modules/type-check": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
+      "integrity": "sha512-XleUoc9uwGXqjWwXaUTZAmzMcFZ5858QA2vvx1Ur5xIcixXIP+8LnFDgRplU30us6teqdlskFfu+ae4K79Ooew==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "prelude-ls": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 0.8.0"
+      }
+    },
+    "node_modules/uri-js": {
+      "version": "4.4.1",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.4.1.tgz",
+      "integrity": "sha512-7rKUyy33Q1yc98pQ1DAmLtwX109F7TIfWlW1Ydo8Wl1ii1SeHieeh0HHfPeL2fMXK6z0s8ecKs9frCuLJvndBg==",
+      "dev": true,
+      "license": "BSD-2-Clause",
+      "dependencies": {
+        "punycode": "^2.1.0"
+      }
+    },
     "node_modules/util-deprecate": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
       "dev": true,
       "license": "MIT"
+    },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/word-wrap": {
+      "version": "1.2.5",
+      "resolved": "https://registry.npmjs.org/word-wrap/-/word-wrap-1.2.5.tgz",
+      "integrity": "sha512-BN22B5eaMMI9UMtjrGd5g5eCYPpCPDUy0FJXbYsaT5zYxjFOckS53SQDE3pWkVoWpHXVb3BrYcEN4Twa55B5cA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/yocto-queue": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
+      "integrity": "sha512-rVksvsnNCdJ/ohGc6xgPwyN8eheCxsiLM8mxuE/t/mOVqJewPuO1miLpTHQiRgTKCLexL4MeAFVagts7HmNZ2Q==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index b4d9c32..45a813d 100644
--- a/package.json
+++ b/package.json
@@ -4,12 +4,17 @@
   "description": "Browser-based Amber Electric usage comparison and export tool",
   "scripts": {
     "build:css": "tailwindcss -i ./css/input.css -o ./css/app.css --minify",
-    "test": "node tests/unit-review.js && node tests/unit-time.js && node tests/unit-bill.js && node tests/unit-stats.js && node tests/unit-demand.js && node tests/unit-billcheck.js && node tests/unit-redispatch.js && node tests/unit-import.js && node tests/unit-estimate.js && node tests/unit-planner.js && playwright test",
-    "test:unit": "node tests/unit-review.js && node tests/unit-time.js && node tests/unit-bill.js && node tests/unit-stats.js && node tests/unit-demand.js && node tests/unit-billcheck.js && node tests/unit-redispatch.js && node tests/unit-import.js && node tests/unit-estimate.js && node tests/unit-planner.js",
+    "lint": "eslint .",
+    "test": "npm run test:unit && playwright test",
+    "test:unit": "node tests/unit-syntax.js && node tests/unit-review.js && node tests/unit-time.js && node tests/unit-bill.js && node tests/unit-stats.js && node tests/unit-demand.js && node tests/unit-billcheck.js && node tests/unit-redispatch.js && node tests/unit-import.js && node tests/unit-estimate.js && node tests/unit-planner.js",
     "serve": "node scripts/static-server.js"
   },
   "devDependencies": {
+    "@eslint/js": "^10.0.1",
     "@playwright/test": "^1.55.0",
+    "@stylistic/eslint-plugin": "^5.10.0",
+    "eslint": "^10.14.0",
+    "globals": "^17.14.0",
     "tailwindcss": "^3.4.17"
   }
 }
diff --git a/scripts/static-server.js b/scripts/static-server.js
index d6676eb..02f6891 100644
--- a/scripts/static-server.js
+++ b/scripts/static-server.js
@@ -17,7 +17,7 @@ const types = {
 
 const server = http.createServer((req, res) => {
     const urlPath = decodeURIComponent((req.url || '/').split('?')[0]);
-    let filePath = path.join(root, urlPath === '/' ? 'index.html' : urlPath);
+    const filePath = path.join(root, urlPath === '/' ? 'index.html' : urlPath);
     if (!filePath.startsWith(root)) {
         res.writeHead(403);
         res.end('Forbidden');
diff --git a/tests/nem12.spec.js b/tests/nem12.spec.js
index 3d5b1cf..f7da7e1 100644
--- a/tests/nem12.spec.js
+++ b/tests/nem12.spec.js
@@ -1,6 +1,5 @@
 const { test, expect } = require('@playwright/test');
 
-const pad = (n) => String(n).padStart(2, '0');
 const addDays = (d, n) => new Date(Date.parse(d + 'T00:00:00Z') + n * 86400000).toISOString().substring(0, 10);
 
 // Two whole months of 30-minute NEM12 data (NEM time): evening use, midday exports.
@@ -119,7 +118,7 @@ test('switching between an Amber site and an imported household swaps the Amber
 test('header-less NEM12 (data rows only) with a daytime hot-water circuit', async ({ page }) => {
     await page.goto('/');
     const lines = [];
-    for (const [suffix, fn] of [['E1', (i) => 0.03], ['E3', (i) => (i >= 180 && i < 192) || (i >= 240 && i < 252) ? 0.4 : 0]]) {
+    for (const [suffix, fn] of [['E1', () => 0.03], ['E3', (i) => (i >= 180 && i < 192) || (i >= 240 && i < 252) ? 0.4 : 0]]) {
         lines.push(`200,4102382010,E1E3,${suffix},${suffix},${suffix},M1,kWh,5, `);
         for (let d = '2026-05-01'; d <= '2026-05-31'; d = addDays(d, 1)) {
             lines.push(`300,${d.replace(/-/g, '')},${Array.from({ length: 288 }, (_, i) => fn(i).toFixed(7)).join(',')} , ,20260602000000,`);
diff --git a/tests/planner.spec.js b/tests/planner.spec.js
index b75175b..009089a 100644
--- a/tests/planner.spec.js
+++ b/tests/planner.spec.js
@@ -52,12 +52,6 @@ async function onlyPlans(page, keep) {
     await page.keyboard.press('Escape');
 }
 
-async function tickAll(page) {
-    await page.click('#planRetailers summary');
-    await page.click('#planRetailersPanel [data-plan-all="1"]');
-    await page.keyboard.press('Escape');
-}
-
 async function importYear(page, file) {
     await page.route('**/api.amber.com.au/**', (route) => route.abort());
     await page.goto('/');
diff --git a/tests/ui.spec.js b/tests/ui.spec.js
index 4c77959..bcc2975 100644
--- a/tests/ui.spec.js
+++ b/tests/ui.spec.js
@@ -136,7 +136,6 @@ test.describe('Amber UI flows', () => {
 
         // A year of Amber readings saved in this browser (as if imported): evening use, cheap middays, some spikes.
         await page.evaluate(async () => {
-            const pad = (n) => String(n).padStart(2, '0');
             const entries = [];
             const start = Date.UTC(2025, 9, 1);
             for (let d = 0; d < 365; d++) {
diff --git a/tests/unit-planner.js b/tests/unit-planner.js
index 4a15212..cf07382 100644
--- a/tests/unit-planner.js
+++ b/tests/unit-planner.js
@@ -241,7 +241,7 @@ assert(plans.some((p) => p.config.tou && p.config.tou.free && p.config.tou.free.
             `worth in today's money counts it: $${cashOnly.toFixed(0)} → $${bigFin.npv.toFixed(0)}`);
         // How keen to be. A 15 kW system costing $14,550 that's worth $5,105 (about $1.35 back per $1,
         // paying back in 9.7 years) is only Modest; $1.70 back and 7 years is Good; Strong needs more.
-        const keen = (npv, capex, payback, lowNpv) => Amber.plannerKeenLevel({ npv, capex, payback, lowNpv });
+        const keen = (npv, cost, payback, lowNpv) => Amber.plannerKeenLevel({ npv, capex: cost, payback, lowNpv });
         assert(keen(5105, 14550, 9.7, 900) === 2 && keen(11932, 17010, 7.0, 6000) === 3 && keen(14000, 17000, 6.5, 8000) === 4
             && keen(14000, 17000, 9, 8000) === 3 && keen(9000, 17000, 7, -50) === 2 && keen(1500, 17000, 15, -3000) === 1
             && keen(-500, 17000, null, -4000) === 0 && keen(0, 0, 0, 0) === null,
diff --git a/tests/unit-syntax.js b/tests/unit-syntax.js
new file mode 100644
index 0000000..6a4d6dd
--- /dev/null
+++ b/tests/unit-syntax.js
@@ -0,0 +1,47 @@
+'use strict';
+
+/*
+ * Every js/*.js must parse as a classic script, and index.html must load every one of them.
+ * No other unit script loads the DOM files (help.js, app.js, …), so without this a syntax error
+ * in one of them is first seen by the browser tests.
+ */
+const fs = require('fs');
+const path = require('path');
+const vm = require('vm');
+
+const root = path.join(__dirname, '..');
+const dir = path.join(root, 'js');
+const files = fs.readdirSync(dir).filter((name) => name.endsWith('.js')).sort();
+
+let failed = 0;
+function assert(cond, message) {
+    if (!cond) { failed += 1; console.error('FAIL:', message); } else { console.log('ok:', message); }
+}
+
+const broken = [];
+files.forEach((name) => {
+    try {
+        // Compiles without running, as the browser would parse a <script src>.
+        new vm.Script(fs.readFileSync(path.join(dir, name), 'utf8'), { filename: `js/${name}` });
+    } catch (err) {
+        broken.push(name);
+        console.error(`FAIL: js/${name} does not parse: ${err.message}`);
+        console.error(String(err.stack).split('\n').slice(0, 4).join('\n'));
+    }
+});
+assert(files.length > 0 && !broken.length, `${files.length} files in js/ parse as classic scripts`);
+
+const html = fs.readFileSync(path.join(root, 'index.html'), 'utf8');
+const loaded = (html.match(/<script src="js\/[^"?]+/g) || []).map((tag) => tag.replace('<script src="js/', ''));
+const notLoaded = files.filter((name) => !loaded.includes(name));
+const missing = loaded.filter((name) => !files.includes(name));
+const twice = loaded.filter((name, i) => loaded.indexOf(name) !== i);
+assert(!notLoaded.length, `index.html loads every file in js/${notLoaded.length ? ` (not loaded: ${notLoaded.join(', ')})` : ''}`);
+assert(!missing.length && !twice.length, `every js/ script tag in index.html names one file, once${missing.concat(twice).length ? ` (check: ${missing.concat(twice).join(', ')})` : ''}`);
+assert(loaded[loaded.length - 1] === 'app.js', 'app.js is the last script (it starts the page)');
+
+if (failed) {
+    console.error(`${failed} syntax test(s) failed`);
+    process.exit(1);
+}
+console.log('syntax tests passed');
diff --git a/tests/unit-time.js b/tests/unit-time.js
index ee66775..77ecdb6 100644
--- a/tests/unit-time.js
+++ b/tests/unit-time.js
@@ -78,7 +78,7 @@ const clockA = Amber.clockPartsForItem(clockItem, vicLocal, 'VIC');
 const clockB = Amber.clockPartsForItem(clockItem, vicLocal, 'VIC');
 assert(clockA === clockB, 'clock parts are cached on the usage item');
 assert(clockA.hours === 17, 'cached Melbourne DST hour is 17');
-assert(Amber.APP_VERSION === '1.62', 'app version is 1.62');
+assert(Amber.APP_VERSION === '1.63', 'app version is 1.63');
 assert(Amber.DEFAULT_AMBER_CONNECTION_CENTS === 125.367 && Amber.PREVIOUS_AMBER_CONNECTION_CENTS === 116.787, 'Amber daily connection defaults (2026-27 and 2025-26)');
 assert(Amber.DEFAULT_AMBER_SUBSCRIPTION_CENTS === 82.181, 'Amber subscription default');
 assert(Amber.DEFAULT_AMBER_DEMAND_CENTS === 43.431 && Amber.PREVIOUS_AMBER_DEMAND_CENTS === 42.345, 'Amber demand defaults (2026-27 and 2025-26)');