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National Grid ESO API alternatives

Open data from Great Britain’s Electricity System Operator. If it doesn't fit your project, here are the 10 best free Environment APIs to use instead in 2026, out of 29 in the directory.

For reference, National Grid ESO API: No API key needed · HTTPS.

  1. 1kanari logo

    kanari API

    Online · 527 ms

    Real-time worldwide wildfire detections, water bomber tracking and open fire archive.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  2. 2Open-Meteo logo

    Open-Meteo API

    Online · 609 ms

    Free weather API for non-commercial use.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  3. 3Sähkön hinta nyt logo

    Sähkön hinta nyt API

    Online · 1106 ms

    Finnish and Nordic day-ahead electricity spot prices (15-minute), cheapest hours.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  4. 4

    WattFigure API

    Online · 712 ms

    US electricity rates by state, with appliance and EV charging running costs.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  5. 5Danish data service Energi logo

    Danish data service Energi API

    Online · 867 ms

    Open energy data from Energinet to society.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?
  6. 6GridVigil logo

    GridVigil API

    Online · 1588 ms

    Pressure scores, demand, generation mix and alerts for the 10 major U.S. power grids.

    • No API key needed
    • Callable from the browser (CORS)
    • HTTPS
    No authHTTPSCORS
  7. 7UK Carbon Intensity logo

    UK Carbon Intensity API

    Online · 869 ms

    The Official Carbon Intensity API for Great Britain developed by National Grid.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?
  8. 8PM2.5 Open Data Portal logo

    PM2.5 Open Data Portal API

    Online · 1110 ms

    Open low-cost PM2.5 sensor data.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?
  9. 9

    Website Carbon API

    Online · 684 ms

    API to estimate the carbon footprint of loading web pages.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?
  10. 10CO2 Offset logo

    CO2 Offset API

    Online · 1414 ms

    API calculates and validates the carbon footprint.

    • No API key needed
    • HTTPS
    No authHTTPSCORS ?

National Grid ESO API vs alternatives

National Grid ESO API compared with its alternatives
APIAPI keyHTTPSCORSUptimeResponseRating
National Grid ESONoYesUnknownDown–Not rated
kanari logokanariNoYesYesUp527 msNot rated
Open-Meteo logoOpen-MeteoNoYesYesUp609 msNot rated
Sähkön hinta nyt logoSähkön hinta nytNoYesYesUp1106 msNot rated
WattFigureNoYesYesUp712 msNot rated
Danish data service Energi logoDanish data service EnergiNoYesUnknownUp867 msNot rated
GridVigil logoGridVigilNoYesYesUp1588 msNot rated
UK Carbon Intensity logoUK Carbon IntensityNoYesUnknownUp869 msNot rated
PM2.5 Open Data Portal logoPM2.5 Open Data PortalNoYesUnknownUp1110 msNot rated

See also: best Environment APIs · all Environment APIs

National Grid ESO API alternatives FAQ

What is the best free alternative to the National Grid ESO API in 2026?

The top-ranked free alternatives to the National Grid ESO API are kanari API, Open-Meteo API and Sähkön hinta nyt API, all in the Environment category. Rankings combine access (API key, HTTPS, CORS), daily uptime checks and developer ratings.

Is there a National Grid ESO API alternative I can call from the browser?

kanari API, Open-Meteo API and Sähkön hinta nyt API support CORS, so front-end JavaScript can call them directly.

How many Environment APIs are similar to the National Grid ESO API?

The directory lists 29 other free Environment APIs. This page compares the top ones side by side.