Solar Energy APIs
Solar energy APIs estimate how much sunlight reaches a site and what panels there would produce. NASA POWER provides satellite-derived solar radiation by coordinate and date, free and keyless, and PVGIS from the European Commission models photovoltaic output. Solematica narrows to Italian roofs, estimating production, cost and ROI from satellite and irradiance data. Free Weather APIs →
| API | Pricing | Auth | Format | Free tier | Status |
|---|---|---|---|---|---|
NASA POWERProvides NASA satellite-derived solar radiation, temperature, and weather-model data by coordinate and date. Weather & Environment › Climate & Carbon | Free | None | JSON | Unlimited | Live |
PVGISSolar radiation and photovoltaic system output estimates for any location, from the EU's PVGIS model. Weather & Environment › Energy | None | JSON | Unlimited | Live | |
SolematicaEstimates solar panel production, ROI and cost for Italian roofs using satellite and irradiance data. Weather & Environment › Energy | Freemium | API key | JSON | — | Live |
NASA POWERFreeLive
Provides NASA satellite-derived solar radiation, temperature, and weather-model data by coordinate and date.
None · JSON
Unlimited
OpenAPI spec · llms.txt
PVGISLive
Solar radiation and photovoltaic system output estimates for any location, from the EU's PVGIS model.
None · JSON
Unlimited
no machine-readable spec
SolematicaFreemiumLive
Estimates solar panel production, ROI and cost for Italian roofs using satellite and irradiance data.
API key · JSON
—
llms.txt
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Choosing a Solar Energy API
Is there a free Solar Energy API?
Yes. NASA POWER is free to use, and Solematica has a free tier alongside paid plans. See all free Weather APIs.
Which Solar Energy APIs work without an API key?
NASA POWER and PVGIS need no key or sign-up, so you can try them with a plain request.
Can I call a Solar Energy API from front-end JavaScript?
NASA POWER allows cross-origin requests and needs no key, so it works straight from the browser. For the others, call them from your server so your key stays private.
Can I use Solar Energy APIs in a commercial project?
Solematica permits commercial use.
Which Solar Energy APIs work with AI agents?
NASA POWER publishes an OpenAPI spec for generating clients and tools.
Broader: Energy APIs · Weather & Environment APIs
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