GridPrice API
Free JSON API for live and historical US electricity prices — the same data the GridPrice app and this site run on, normalized into one format across ComEd, Ameren Illinois, ERCOT, NYISO, and SPP. No key required.
Format
Every price point is
{"ms": 1784834400000, "price": 5.9} — ms is the UTC
epoch milliseconds of the start of the interval, price
is US cents per kWh. Arrays are sorted oldest-first. All endpoints are
CORS-open.
Endpoints
| Endpoint | Returns |
|---|---|
GET /v1/providers | list of provider ids |
GET /v1/current?provider=comed | the latest single reading |
GET /v1/feed?provider=comed | roughly the last 24 hours |
GET /v1/history?provider=comed&start=20260701&end=20260723 | stored history between two dates (YYYYMMDD, utility-local days) |
Try it
curl "https://api.gridprice.app/v1/current?provider=comed"
# → {"ms":1784834400000,"price":5.9}
curl "https://api.gridprice.app/v1/feed?provider=ercot-lz_houston"
# → [{"ms":…,"price":4.2},…]
Providers
| id | Source | Granularity |
|---|---|---|
comed | ComEd Hourly Pricing (IL) | 5-minute, live |
ameren-il | Ameren IL Power Smart Pricing | hourly, day-ahead |
ercot-lz_houston · lz_north · lz_south · lz_west · lz_aen · lz_cps | ERCOT load zones (TX) | 15-minute, live |
nyiso-nyc · longil · hudvl · capitl · centrl · west | NYISO zones (NY) | 5-minute, live |
spp-ok · ks · ne · sd · nd | SPP hubs (plains) | 5-minute, live |
History depth
Our server samples every source every 5 minutes and stores what it sees, so history accumulates from July 2026 onward — including sources whose own archives expire (NYISO keeps only ~2 weeks; we keep everything from our start date).
Fair use
Free for personal and non-commercial projects at reasonable request rates (responses are cached ~2 minutes — polling faster gains nothing). Data originates from public utility and grid-operator feeds and is informational only, not billing-quality; see our Terms of Use. Building something on this? Say hello — and consider buying me a coffee.