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.

NLR.gov Domain Transition

The National Laboratory of the Rockies (NLR) is retiring the nrel.gov domain near the end of May and transitioning to the new nlr.gov domain.

To avoid an interruption in service, you need to update your API calls to use the new developer.nlr.gov URLs by April 30, 2026, or by May 29, 2026, with short outages scheduled in May before the old domain expires. Your existing API key will continue to work—only the domain in the URL needs to be updated.

Here is a timeline for this domain change:

March 2, 2026: The new developer.nlr.gov domain is available now to use and begin switching API calls to the new URLs.
May 1, 2026: Periodic brownouts (scheduled outages for short durations) will begin where traffic to the old developer.nrel.gov domain will return errors with instructions about using the new domain. Traffic already switched to the new developer.nlr.gov domain will not be affected.
May 29, 2026: The developer.nrel.gov domain will expire and stop working completely. DNS for the nrel.gov domain and all subdomains will cease to resolve and will not redirect.

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