Existing API Users: Update any developer.nrel.gov references in your code to developer.nlr.gov. The previous developer.nrel.gov domain was retired on May 29, 2026.

NLR.gov Domain Transition

The National Laboratory of the Rockies (NLR) retired the nrel.gov domain on May 29, 2026, after transitioning to the new nlr.gov domain.

If you have not already, you need to update your API calls to use the new developer.nlr.gov URLs. 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 became available to use and begin switching API calls to the new URLs. Emails were sent to all API key owners having made requests in the past year to announce the domain change.
April 15, 2026: Additional reminder emails were sent to API key owners that had not transitioned to the new domain yet.

May 1, 2026: Periodic brownouts (scheduled outages for short durations) began where traffic to the old developer.nrel.gov domain returned errors with instructions about using the new domain. Traffic already switched to the new developer.nlr.gov domain was not affected.

During each brownout period, API requests returned a 410 Gone HTTP error with a message about the domain change.

Scheduled outages occurred during the following times:

Brownout Start	Brownout End	Brownout Duration
`Fri, 01 May 2026, 09:00:00 PM EDT`	`Fri, 01 May 2026, 10:00:00 PM EDT`	`60m`
`Sat, 02 May 2026, 06:00:00 PM EDT`	`Sat, 02 May 2026, 07:00:00 PM EDT`	`60m`
`Sun, 03 May 2026, 08:00:00 AM EDT`	`Sun, 03 May 2026, 09:00:00 AM EDT`	`60m`
`Mon, 04 May 2026, 11:00:00 AM EDT`	`Mon, 04 May 2026, 11:15:00 AM EDT`	`15m`
`Tue, 05 May 2026, 09:00:00 PM EDT`	`Tue, 05 May 2026, 10:00:00 PM EDT`	`60m`
`Wed, 06 May 2026, 01:00:00 PM EDT`	`Wed, 06 May 2026, 01:15:00 PM EDT`	`15m`
`Thu, 07 May 2026, 09:00:00 PM EDT`	`Thu, 07 May 2026, 10:00:00 PM EDT`	`60m`
`Fri, 08 May 2026, 03:00:00 PM EDT`	`Fri, 08 May 2026, 03:15:00 PM EDT`	`15m`
`Sat, 09 May 2026, 12:00:00 PM EDT`	`Sat, 09 May 2026, 01:00:00 PM EDT`	`60m`
`Sun, 10 May 2026, 04:00:00 PM EDT`	`Sun, 10 May 2026, 05:00:00 PM EDT`	`60m`
`Mon, 11 May 2026, 09:30:00 AM EDT`	`Mon, 11 May 2026, 09:45:00 AM EDT`	`15m`
`Tue, 12 May 2026, 11:30:00 AM EDT`	`Tue, 12 May 2026, 11:45:00 AM EDT`	`15m`
`Wed, 13 May 2026, 01:30:00 PM EDT`	`Wed, 13 May 2026, 01:45:00 PM EDT`	`15m`
`Wed, 13 May 2026, 09:00:00 PM EDT`	`Wed, 13 May 2026, 10:00:00 PM EDT`	`60m`
`Thu, 14 May 2026, 03:30:00 PM EDT`	`Thu, 14 May 2026, 03:45:00 PM EDT`	`15m`
`Fri, 15 May 2026, 05:30:00 PM EDT`	`Fri, 15 May 2026, 05:45:00 PM EDT`	`15m`
`Sat, 16 May 2026, 03:00:00 PM EDT`	`Sat, 16 May 2026, 05:00:00 PM EDT`	`120m`
`Sun, 17 May 2026, 03:00:00 PM EDT`	`Sun, 17 May 2026, 05:00:00 PM EDT`	`120m`
`Mon, 18 May 2026, 10:00:00 AM EDT`	`Mon, 18 May 2026, 10:30:00 AM EDT`	`30m`
`Tue, 19 May 2026, 11:30:00 AM EDT`	`Tue, 19 May 2026, 12:00:00 PM EDT`	`30m`
`Wed, 20 May 2026, 12:00:00 PM EDT`	`Wed, 20 May 2026, 12:30:00 PM EDT`	`30m`
`Thu, 21 May 2026, 01:00:00 PM EDT`	`Thu, 21 May 2026, 01:45:00 PM EDT`	`45m`
`Fri, 22 May 2026, 02:00:00 PM EDT`	`Fri, 22 May 2026, 02:45:00 PM EDT`	`45m`
`Fri, 22 May 2026, 09:00:00 PM EDT`	`Sat, 23 May 2026, 02:00:00 AM EDT`	`300m`
`Sat, 23 May 2026, 01:00:00 PM EDT`	`Sat, 23 May 2026, 04:00:00 PM EDT`	`180m`
`Sun, 24 May 2026, 12:00:00 PM EDT`	`Sun, 24 May 2026, 03:00:00 PM EDT`	`180m`
`Mon, 25 May 2026, 02:00:00 AM EDT`	`Mon, 25 May 2026, 07:00:00 AM EDT`	`300m`
`Mon, 25 May 2026, 11:00:00 AM EDT`	`Mon, 25 May 2026, 12:00:00 PM EDT`	`60m`
`Tue, 26 May 2026, 07:00:00 AM EDT`	`Tue, 26 May 2026, 12:00:00 PM EDT`	`300m`
`Tue, 26 May 2026, 02:00:00 PM EDT`	`Tue, 26 May 2026, 03:00:00 PM EDT`	`60m`
`Wed, 27 May 2026, 07:00:00 AM EDT`	`Wed, 27 May 2026, 08:00:00 AM EDT`	`60m`
`Wed, 27 May 2026, 12:00:00 PM EDT`	`Wed, 27 May 2026, 05:00:00 PM EDT`	`300m`
`Thu, 28 May 2026, 11:00:00 AM EDT`	`Thu, 28 May 2026, 12:00:00 PM EDT`	`60m`
`Thu, 28 May 2026, 05:00:00 PM EDT`	`Fri, 29 May 2026, 12:00:00 AM EDT`	`420m`

May 29, 2026: The developer.nrel.gov domain expired and stopped working completely. DNS for the nrel.gov domain and all subdomains ceased to resolve and will not redirect.

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