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Danish data service Energi vs National Grid ESO

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

APIDanish data service EnergiHEALTHY87National Grid ESOHEALTHY92
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms888609
P95 · ms27891311
Authnonenone
CORSnoyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedNESO Open Data Licence (OGL-based); varies per dataset
Free tierFree — no API keyFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Danish data service Energi vs National Grid ESO: common questions

Which is more reliable, Danish data service Energi or National Grid ESO?

Both are neck-and-neck — Danish data service Energi and National Grid ESO each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Danish data service Energi or National Grid ESO?

National Grid ESO has the lower median latency in our checks — Danish data service Energi responds in 888 ms versus National Grid ESO at 609 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.

Do Danish data service Energi and National Grid ESO need an API key?

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

Can I call Danish data service Energi and National Grid ESO from the browser?

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

Are Danish data service Energi and National Grid ESO free for commercial use?

Danish data service Energi has unclear commercial terms, and National Grid ESO 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.