Existing API Users: Update any developer.nrel.gov references in your code to developer.nlr.gov by April 30, 2026, to avoid service interruptions.
Learn more about the domain transition.
Building Component Library
Access energy data on individual components or energy conservation measures for buildings. This data can be used to create building energy models.
For web service details, documentation, and access, see the Building Component Library API documentation.
Note: Your developer.nlr.gov API key will not work for the Building Component Library API. Instead, refer to the Building Component Library documentation for access.