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GrünstromIndex vs UK Carbon Intensity

Same instrument, two spec sheets — measured, not claimed.

APIGrünstromIndexNEW—UK Carbon IntensityNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearyes
Data licenseUnverifiedCC BY 4.0 (per API docs)
Free tierFree under fair-use policyFree — no API key
Rate limitFair-use (paid tiers for higher limits)Unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

GrünstromIndex vs UK Carbon Intensity: common questions

Which is more reliable, GrünstromIndex or UK Carbon Intensity?

On our scheduled checks, UK Carbon Intensity leads on measured uptime — GrünstromIndex at —% versus UK Carbon Intensity at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.

Do GrünstromIndex and UK Carbon Intensity need an API key?

Neither needs a paid key — GrünstromIndex is callable with no signup, and UK Carbon Intensity is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call GrünstromIndex and UK Carbon Intensity from the browser?

Yes — both GrünstromIndex and UK Carbon Intensity send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.

Are GrünstromIndex and UK Carbon Intensity free for commercial use?

GrünstromIndex has unclear commercial terms, and UK Carbon Intensity allows commercial use on its free tier. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.