Environment · head-to-head
UK Carbon Intensity vs Website Carbon
This is the official carbon intensity forecast and outturn API for Great Britain's electricity grid, published by National Grid ESO, giving live and forecast gCO2/kWh figures nationally and regionally. It's a fully open government data feed with no key required.
Website Carbon estimates the CO2 emitted by loading a web page, based on page weight and whether the host uses green hosting, returning a digital carbon rating alongside the raw gCO2e figure. As of 14 July 2025 the provider retired public access to its convenience /site endpoint (which fetched a URL for you); the /data endpoint, which takes bytes and a green-hosting flag directly, remains free and open with no key.
| UK Carbon Intensity | Website Carbon | |
|---|---|---|
| Authentication | None | None |
| Pricing | free | free |
| Formats | JSON | JSON |
| CORS | yes | no |
| HTTPS | Yes | Yes |
UK Carbon Intensity supports CORS, while Website Carbon doesn't — pick UK Carbon Intensity for direct browser calls.