Add docs page explaining NREL to NLR rename

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: jason-curtis

docs/sphinx/source/user_guide/extras/nrel_nlr.rst

@@ -0,0 +1,30 @@
+.. _nrel_nlr:
+
+==============================
+NREL to NLR Rename (Dec 2025)
+==============================
+
+In December 2025, the U.S. Department of Energy renamed the
+**National Renewable Energy Laboratory (NREL)** to the
+**National Laboratory of the Rockies (NLR)**.
+
+
+Domain migration
+****************
+
+The lab's website moved from ``nrel.gov`` to ``nlr.gov``.  The ``nrel.gov``
+domain is expected to stop resolving on **May 29, 2026**.  The GitHub
+organization moved from ``github.com/NREL`` to ``github.com/NatLabRockies``.
+pvlib will update API and repository URLs as the migration progresses.
+
+
+When we use NREL vs NLR
+***********************
+
+- **NREL**: historical publications, citations, and algorithm references
+  (e.g. the NREL SPA) published under the original name.
+- **NLR**: the current organization, its software and data products,
+  and new ``nlr.gov`` URLs.
+
+Most existing pvlib code and docs say "NREL" because it appears in
+bibliographic citations.  These do not need to be updated.

docs/sphinx/source/user_guide/index.rst

@@ -34,4 +34,5 @@ This user guide is an overview and explains some of the key features of pvlib.
    :caption: Extras
 
    extras/nomenclature
+   extras/nrel_nlr
    extras/faq