National Grid ESO vs US Weather
Same instrument, two spec sheets — measured, not claimed.
National Grid ESO vs US Weather: common questions
Which is more reliable, National Grid ESO or US Weather?
On our scheduled checks, US Weather leads on measured uptime — National Grid ESO at —% versus US Weather 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 US Weather need an API key?
Neither needs a paid key — National Grid ESO is callable with no signup, and US Weather is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call National Grid ESO and US Weather from the browser?
Yes — both National Grid ESO and US Weather 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 US Weather free for commercial use?
National Grid ESO has unclear commercial terms, and US Weather 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.