Developers

Learn about the CommonGrid API, explore endpoints, and manage your API keys.

Build on the CommonGrid API

An open REST API for U.S. electric grid data — utilities, power plants, transmission, pricing nodes, and more.

The CommonGrid API is free and open. You can start querying public endpoints right away — no account or API key required. API keys are optional and only exist to unlock higher rate limits; the data you can reach is the same either way.

Try it now — this returns a paginated list of U.S. utilities as JSON, no authentication needed:

curl https://commongrid.info/api/v1/utilities

Explore the API reference

Rate limits

API keys buy higher limits — not extra data or access.

Your current tierAnonymous

Rate limit: 60/hr — sign in and create a key to raise this.

Anonymous (60/hr)

No authentication required. Great for testing and small projects.

Current

Registered (5,000/hr)

Free tier with API key authentication. Ideal for most applications.

Bulk (50,000/hr)

For high-volume integrations. Contact us to request bulk access.

Need higher limits? Contact us to discuss bulk access options.

API Documentation

Explore endpoints, request/response formats, and integration guides

View Docs