# Carbon Intensity API (GB)

Category: [Energy and environment](https://free-web-services.com/web-services/open-data/energy/)  
Page: https://free-web-services.com/web-services/open-data/energy/carbon-intensity-api-gb.html  
Documentation: https://carbon-intensity.github.io/api-definitions/

The Carbon Intensity API from National Energy System Operator (NESO) gives the carbon intensity of electricity in Great Britain, per half hour, with a forecast up to 48 hours ahead, the generation mix (gas, wind, solar, nuclear and more) and regional figures. Useful for scheduling energy use at greener times. Responses are JSON. Free, no key needed.

- API key: Not needed
- Pricing: Free, no key needed.
- From the browser: Yes (CORS)
- Formats: JSON
- Interface: REST, HTTP-GET
- Provider: carbon-intensity.github.io
- Last checked: Working on November 8th, 2026

Example request:

```sh
curl 'https://api.carbonintensity.org.uk/intensity'
```

The JavaScript works in a web page as well as in Node.js 18 or newer.