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// cents/kWh\n};\n\ntype StoredPrice = {\n hour: number; // ms since epoch\n price: number;\n};\n\nexport default async function (req: Request): Promise {\n const params = new URL(req.url).searchParams;\n const sensitivityCents = parseFloat(params.get(\"sensitivity\") || \"0.1\");\n const lookbackHours = parseInt(params.get(\"lookback\") || \"24\");\n const lookforwardHours = parseInt(params.get(\"lookforward\") || \"24\");\n\n const now = Date.now();\n const [historicalPrices, dayAheadPrices] = await Promise.all([\n fetchHistoricalHourly(now, lookbackHours),\n fetchDayAhead(now, lookforwardHours),\n ]);\n\n const allPrices = deduplicateAndMerge(historicalPrices, dayAheadPrices);\n const ical = generateICal(allPrices, sensitivityCents);\n\n return new Response(ical, {\n headers: {\n \"Content-Type\": \"text/calendar; charset=utf-8\",\n \"Content-Disposition\": 'attachment; filename=\"comed-prices.ics\"',\n },\n });\n}\n\nasync function fetchHistoricalHourly(\n now: number,\n lookbackHours: number,\n): Promise {\n const start = new Date(now - lookbackHours * 3600000);\n const datestart = formatAPIDate(start);\n const res = await fetch(\n `https://hourlypricing.comed.com/api?type=5minutefeed&datestart=${datestart}`,\n );\n const data: PricePoint[] = await res.json();\n return calculateHourlyAverages(data);\n}\n\nasync function fetchDayAhead(\n now: number,\n lookforwardHours: number,\n): Promise {\n if (lookforwardHours <= 0) return [];\n\n const cutoff = now + lookforwardHours * 3600000;\n\n const hasData = await fetch(\n \"https://hourlypricing.comed.com/rrtp/ServletFeed?type=hasdaynexttomorrow\",\n ).then((r) => r.text());\n\n if (hasData.trim() === \"true\") {\n const raw = await fetch(\n \"https://hourlypricing.comed.com/rrtp/ServletFeed?type=daynexttomorrow\",\n ).then((r) => r.text());\n\n const prices = parseDayAhead(raw);\n if (prices.length > 0) {\n const stored: StoredPrice[] = prices.map((p) => ({\n hour: p.hour.getTime(),\n price: p.price,\n }));\n await blob.setJSON(BLOB_KEY, stored);\n }\n return prices.filter((p) => p.hour.getTime() <= cutoff);\n }\n\n // Fall back to cached prices, returning only future hours within the window\n const cached = await blob.getJSON(BLOB_KEY).catch(() => null) as\n | StoredPrice[]\n | null;\n if (!cached) return [];\n\n return cached\n .filter((p) => p.hour > now && p.hour <= cutoff)\n .map((p) => ({ hour: new Date(p.hour), price: p.price }));\n}\n\nfunction formatAPIDate(date: Date): string {\n const y = date.getUTCFullYear();\n const m = String(date.getUTCMonth() + 1).padStart(2, \"0\");\n const d = String(date.getUTCDate()).padStart(2, \"0\");\n const h = String(date.getUTCHours()).padStart(2, \"0\");\n const min = String(date.getUTCMinutes()).padStart(2, \"0\");\n return `${y}${m}${d}${h}${min}`;\n}\n\nfunction parseDayAhead(raw: string): HourlyAverage[] {\n const results: HourlyAverage[] = [];\n const pattern =\n /Date\\.UTC\\((\\d+),(\\d+),(\\d+),(\\d+),\\d+,\\d+\\)\\s*,\\s*([-\\d.]+)/g;\n let match;\n\n while ((match = pattern.exec(raw)) !== null) {\n const [, year, month, day, hour, price] = match;\n results.push({\n hour: new Date(\n Date.UTC(\n parseInt(year),\n parseInt(month),\n parseInt(day),\n parseInt(hour),\n ),\n ),\n price: Math.round(parseFloat(price) * 100) / 100,\n });\n }\n\n return results;\n}\n\nfunction calculateHourlyAverages(data: PricePoint[]): HourlyAverage[] {\n const buckets = new Map();\n\n for (const point of data) {\n const date = new Date(parseInt(point.millisUTC));\n const hourKey = [\n date.getUTCFullYear(),\n date.getUTCMonth(),\n date.getUTCDate(),\n date.getUTCHours(),\n ].join(\"-\");\n\n if (!buckets.has(hourKey)) buckets.set(hourKey, []);\n buckets.get(hourKey)!.push(parseFloat(point.price));\n }\n\n const averages: HourlyAverage[] = [];\n for (const [key, prices] of buckets) {\n const [year, month, day, hour] = key.split(\"-\").map(Number);\n const avg = prices.reduce((a, b) => a + b, 0) / prices.length;\n averages.push({\n hour: new Date(Date.UTC(year, month, day, hour)),\n price: Math.round(avg * 100) / 100,\n });\n }\n\n averages.sort((a, b) => a.hour.getTime() - b.hour.getTime());\n return averages;\n}\n\nfunction deduplicateAndMerge(\n historical: HourlyAverage[],\n dayAhead: HourlyAverage[],\n): HourlyAverage[] {\n const byTime = new Map();\n\n // Historical first, day-ahead overwrites any overlap\n for (const h of historical) byTime.set(h.hour.getTime(), h);\n for (const d of dayAhead) byTime.set(d.hour.getTime(), d);\n\n return Array.from(byTime.values()).sort(\n (a, b) => a.hour.getTime() - b.hour.getTime(),\n );\n}\n\nfunction generateICal(\n hourlyPrices: HourlyAverage[],\n thresholdCents: number,\n): string {\n const events: string[] = [];\n\n for (let i = 1; i < hourlyPrices.length; i++) {\n const prev = hourlyPrices[i - 1];\n const curr = hourlyPrices[i];\n const delta = curr.price - prev.price;\n\n if (Math.abs(delta) < thresholdCents) continue;\n\n const direction = delta > 0 ? \"\\u2191\" : \"\\u2193\";\n const sign = delta > 0 ? \"+\" : \"\";\n const fmt = (n: number) => {\n const s = n.toFixed(1);\n return s === \"-0.0\" ? \"0.0\" : s;\n };\n const start = formatDateUTC(curr.hour);\n const end = formatDateUTC(new Date(curr.hour.getTime() + 3600000));\n const uid = `comed-${start}@hourlypricing`;\n\n events.push(\n [\n \"BEGIN:VEVENT\",\n `DTSTART:${start}`,\n `DTEND:${end}`,\n `SUMMARY:${direction} ${fmt(curr.price)}c/kWh (${sign}${fmt(delta)}c)`,\n `DESCRIPTION:ComEd price ${delta > 0 ? \"rose\" : \"fell\"} from ${\n fmt(prev.price)\n }c to ${\n fmt(curr.price)\n }c per kWh\\\\nhttps://hourlypricing.comed.com/live-prices/`,\n `UID:${uid}`,\n \"END:VEVENT\",\n ].join(\"\\r\\n\"),\n );\n }\n\n return [\n \"BEGIN:VCALENDAR\",\n \"VERSION:2.0\",\n \"PRODID:-//ComEd Hourly Pricing//joshbeckman.org\",\n \"X-WR-CALNAME:ComEd Electricity Prices\",\n \"X-WR-TIMEZONE:America/Chicago\",\n ...events,\n \"END:VCALENDAR\",\n \"\",\n ].join(\"\\r\\n\");\n}\n\nfunction formatDateUTC(date: Date): string {\n const iso = date.toISOString();\n return (\n iso.slice(0, 4) +\n iso.slice(5, 7) +\n iso.slice(8, 13) +\n iso.slice(14, 16) +\n iso.slice(17, 19) +\n \"Z\"\n );\n}","deleted","label",[115],"0ec2de12-2788-11f1-95da-42dde27851f2","README.md","315f5688-150b-11f1-9b8f-42dde27851f2",["D",1774360074176],5,"# ComEd Hourly Pricing iCal Feed\n\nAn iCal calendar feed of\n[ComEd electricity price](https://hourlypricing.comed.com/live-prices/) changes,\ngenerated from their real-time and day-ahead pricing APIs. Subscribe to it in\nany calendar app to see when prices shift.\n\nThe feed pulls the last 24 hours of 5-minute prices (averaged into hourly\nbuckets) and the next day's hourly day-ahead prices, then emits a calendar event\nfor each hour where the price changed significantly from the previous hour.\n\n**Live endpoint:**\n[`joshbeckman--d23ef674150811f1a11742dde27851f2.web.val.run`](https://joshbeckman--d23ef674150811f1a11742dde27851f2.web.val.run)\n\n## Query Parameters\n\nAll optional. Defaults give a ~48-hour window with fine-grained sensitivity.\n\n| Param | Default | Unit | Description |\n| ------------- | ------- | --------- | ---------------------------------------------------------------- |\n| `sensitivity` | `0.1` | cents/kWh | Minimum price change to generate an event. `0.1` = $0.001/kWh. |\n| `lookback` | `24` | hours | How far back to fetch historical 5-minute prices. |\n| `lookforward` | `24` | hours | How far forward to include day-ahead prices. Set to `0` to skip. |\n\n### Examples\n\n```\n# Default: ~48hr window, events on any 0.1¢+ change\n/\n\n# Only show large price swings (0.5¢+), last 12 hours + next 12\n/?sensitivity=0.5&lookback=12&lookforward=12\n\n# Historical only, no day-ahead prices\n/?lookforward=0\n\n# Very sensitive, full window\n/?sensitivity=0.01\n```\n\n## Data Sources\n\n- **Historical (past):**\n [ComEd 5-Minute Price API](https://hourlypricing.comed.com/hp-api/) — returns\n 5-minute interval prices, which we average into hourly buckets.\n- **Day-ahead (future):** ComEd's `/rrtp/ServletFeed?type=daynexttomorrow` —\n returns hourly day-ahead market prices for the next day. ComEd doesn't publish\n these on a fixed schedule — the feed checks availability first and only\n includes them when present. Typically they appear in the evening (Central\n time) for the following day. Day-ahead prices are cached in Val.town blob\n storage so they persist after the endpoint stops publishing them — otherwise\n there's a gap between the last historical price and end of day.\n\n## Calendar Events\n\nEach event spans one hour and represents a price change from the previous hour:\n\n- **Summary:** `↑ 3.7c/kWh (+0.9c)` or `↓ 2.1c/kWh (-0.3c)`\n- **Description:** Plain text explanation with a link to\n [ComEd Live Prices](https://hourlypricing.comed.com/live-prices/)\n\nHours where the price is stable (change below the sensitivity threshold) produce\nno event, so gaps in the calendar mean steady pricing.\n\n## Deploying\n\nThis is a [Val.town](https://val.town) HTTP val. The source is in\n`comed-ical.ts` — deploy it as a new val with the \"HTTP\" type and it will serve\nthe iCal feed at the val's URL.",[133],"pulls",0,"forks","envVars",{"_146":140,"_148":140},"connections",{"_146":140,"_147":140},"count","unfilledCount","emptyCount",{"_20":132,"_13":133,"_116":134,"_118":-5,"_119":21,"_120":30,"_122":107,"_22":155,"_29":136,"_125":100,"_127":137,"_129":38,"_130":-5,"_152":156,"_88":157},{"_20":114,"_13":115,"_116":117,"_118":-5,"_119":21,"_120":121,"_122":107,"_22":151,"_29":124,"_125":126,"_127":128,"_129":38,"_130":-5,"_152":153,"_88":154},["D",1774359997801],"children",[],[115],["D",1774360074176],[],[133],["D",1772326305620],{"_11":12,"_86":82},{"_11":12,"_80":-5,"_81":82,"_45":46,"_83":84,"_85":38},{"_29":30,"_13":26,"_20":21,"_27":28,"_31":-5,"_32":-5,"_75":-5,"_76":-5,"_77":-5,"_78":14,"_79":12},"ctx",{"_68":-5,"_109":195,"_196":197,"_198":199,"_200":38,"_201":38,"_202":38,"_203":107,"_204":-5,"_205":-7,"_206":-7,"_207":140,"_208":38,"_209":38,"_210":-5,"_211":38,"_212":38,"_213":38,"_214":-5},"ENV",{"_166":167,"_168":169,"_170":26,"_171":172,"_173":174,"_175":176,"_177":178,"_179":180,"_181":182,"_183":184,"_185":186,"_187":188,"_189":190,"_191":192,"_193":194},"REACT_APP_SENTRY_DSN","https://586020d86f05489db63a554690acf1e9@o1398359.ingest.sentry.io/6724499","RENDER_GIT_COMMIT","e87eb04e707cf64e7e532c8e8ec395f209e17f15","RENDER_GIT_BRANCH","POSTHOG_API_TOKEN","phc_nmoyuAkStEZuUp69rYlg1DZgrIt19Gx0Y4Hwf8tGgJP","POSTHOG_API_HOST","https://wart.val.town","WEB_API_TEMPLATE","https://{val}.web.val.run","APP_URL","https://www.val.town","MODULE_URL","https://esm.town","VANITY_WEB_API_TEMPLATE","https://{label}.val.run/","DENOLS_URL","https://lsp.val.town","NODE_ENV","production","CLOUDFLARE_TURNSTILE_SITE_KEY","0x4AAAAAACtaIZJH7s9rBMZ6","GOOGLE_CLIENT_ID","875989696899-jtsqkhlbdv5jrlsk8631p7ipjg3c6o62.apps.googleusercontent.com","STRIPE_PUBLISHABLE_KEY","pk_live_51N2zvWEpZTTLipIkVEwXrUG9AT0yeOOEYxszarZT1jpsZV58Ly6wlg3SltZpHN26CUalOBmUSY7adQRQiSkCZz2500qSXNkf8Y","API_URL","https://api.val.town",[],"preferencesKeybindings","default","preferencesTheme","light","preferencesFixers","preferencesCopilot","preferencesSelectionAi","preferencesCloseBrackets","preferencesChatPanelState","preferencesDprint","preferencesDenofmt","notificationCount","flagDenols","isBusinessOrgMember","businessOrgHandle","isBusinessOrgAdmin","isHigherTownieTier","navCollapsed","currentOrgId"]

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