Source-reviewed energy company knowledge graph and directory exports.
BTU Graph API is a free Open Data API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.
Download BTU Graph's source-reviewed energy company directory as graph JSON or CSV, inspect its schema, and follow the public update feed.
Details from btugraph.com.

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The BTU Graph API is provided by BTU Graph (btugraph.com). Download BTU Graph's source-reviewed energy company directory as graph JSON or CSV, inspect its schema, and follow the public update feed.
Yes. The BTU Graph API is listed in the Open Data category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
No. The BTU Graph API requires no authentication, so you can start making requests without signing up.
Yes. The BTU Graph API supports CORS, so front-end JavaScript can call it directly.
Yes. The BTU Graph API is served over HTTPS, so it's safe to use in production.