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National Grid ESO vs Open-Meteo Archive

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

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

National Grid ESO vs Open-Meteo Archive: common questions

Which is more reliable, National Grid ESO or Open-Meteo Archive?

On our scheduled checks, Open-Meteo Archive leads on measured uptime — National Grid ESO at —% versus Open-Meteo Archive 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 Open-Meteo Archive need an API key?

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

Can I call National Grid ESO and Open-Meteo Archive from the browser?

Yes — both National Grid ESO and Open-Meteo Archive 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 National Grid ESO and Open-Meteo Archive free for commercial use?

National Grid ESO has unclear commercial terms, and Open-Meteo Archive 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.