- Delivers Solar Radiation and PV Power Data Software


The Solcast API delivers solar radiation and PV power data for anywhere on Earth: past, present and forecast. ‘Live’ estimated actuals and Rapid Update Forecasts are available in satellite coverage areas across the globe (except Antarctica). ‘Recent’ (past few months) and ‘Historical’ (up to 12 years back) data is available to download via the Solcast API Toolkit.

With our API service, you can:

Provide your location and basic PV array characterstics, and instantly get a PV power output forecast

Access our worldwide solar radiation estimates to power your own modelling or research

Get real-time estimated actual radiation data acrosss all continents (except Antarctica)

Provide us with power output data from your fleet of PV systems, and we'll apply analytics to individualise your forecasts

Through partnerships with universities and the energy industry, our solar radiation forecasting and modelling technology is powered by the latest and best peer reviewed science.

We feature a fusion of unique and disparate sources - satellites, weather models, solar inverters, electricity network information - all of which enable Solcast to model distributed solar in unmatched detail.

We're not a weather company, we're not environmental engineering consultants. Solcast focuses solely on the modeling and forecasting of solar radiation and energy.

The Solcast API is a ‘Freemium’ API. Our Free Tier offering is designed to enable exploration and testing for potential paying users, and to support hobbyist and researcher use cases, too. You can read about our plans and pricing here.

The Solcast API Toolkit is a friendly web user interface that allows non-developers to discover and download data. The Toolkit is also a handy resource for building API calls or managing your account.

Once you register and verify your email address you will be logged into the Solcast API Toolkit and you’ll receive an API key. You can use the API key in three ways:

  • Use the api_key query string parameter with the query string in your API call. E.g. ‘&api_key=YOUR_KEY’ in the URL
  • Basic authentication – use the API key as the username with an empty password
  • Digest authentication – use the API key as the username with empty passw

These API pages have examples for getting started, and you can find full documentation here. There should be enough to get you started, but if you have any questions please contact us via email or instant chat.


Our API makes it easy for you to easily ingest data from the Solcast API into your spreadsheet or other application. You can even request data through your web browser.

The best place to start is by creating an account, and then you’ll be logged into the Solcast API Toolkit, where you can directly download data as CSV using your web browser.

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