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National Grid ESO vs Sunrise-Sunset

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

APINational Grid ESONEW—Sunrise-SunsetNEW—
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 datasetn/a
Free tierFree — limits not publishedUnlimited, attribution requested
Rate limitUnpublishedNo burst traffic
In directory since2026-07-052026-06-22
operationalpartialdownno data

National Grid ESO vs Sunrise-Sunset: common questions

Which is more reliable, National Grid ESO or Sunrise-Sunset?

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

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

Can I call National Grid ESO and Sunrise-Sunset from the browser?

Yes — both National Grid ESO and Sunrise-Sunset 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 Sunrise-Sunset free for commercial use?

National Grid ESO has unclear commercial terms, and Sunrise-Sunset 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.