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National Grid ESO vs Website Carbon

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

APINational Grid ESONEW—Website CarbonNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseNESO Open Data Licence (OGL-based); varies per datasetUnverified
Free tierFree — limits not publishedFree keyless byte-based /data endpoint
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

National Grid ESO vs Website Carbon: common questions

Which is more reliable, National Grid ESO or Website Carbon?

On our scheduled checks, Website Carbon leads on measured uptime — National Grid ESO at —% versus Website Carbon 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 National Grid ESO and Website Carbon need an API key?

Neither needs a paid key — National Grid ESO is callable with no signup, and Website Carbon is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call National Grid ESO and Website Carbon from the browser?

Only National Grid ESO is browser-friendly — it returns CORS headers over HTTPS. Website Carbon needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are National Grid ESO and Website Carbon free for commercial use?

National Grid ESO has unclear commercial terms, and Website Carbon has unclear commercial terms. 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.