v0.12.1 (XXXX, 2025)

Breaking Changes

The following parse_ functions in :py:mod:`pvlib.iotools` are deprecated, with the corresponding read_ functions taking their place: (:issue:`2444`, :pull:`2458`)
- :py:func:`~pvlib.iotools.parse_psm3`
- :py:func:`~pvlib.iotools.parse_cams`
The server parameter in :py:func:`~pvlib.iotools.get_cams` has been renamed to url to be consistent with the other iotools. :pull:`2463`

:py:func:`pvlib.iotools.get_pvgis_tmy` now returns the correct dtypes when when outputformat='epw'. (:issue:`2399`, :pull:`2417`)

:py:mod:`pvlib.ivtools.sdm` is now a subpackage. (:issue:`2252`, :pull:`2256`)
Add a function for estimating PVsyst SDM parameters from IEC 61853-1 matrix data (:py:func:`~pvlib.ivtools.sdm.fit_pvsyst_iec61853_sandia_2025`). (:issue:`2185`, :pull:`2429`)
The parameters for the Ix and Ixx points are now optional when using :py:func:`pvlib.pvsystem.sapm` directly and through :py:class:`~pvlib.pvsystem.PVSystem` and :py:class:`~pvlib.modelchain.ModelChain`. (:issue:`2402`, :pull:`2433`)
Add optional arguments temperature_ref and irradiance_ref to :py:func:`~pvlib.pvsystem.sapm`(:issue:`2432`, :pull:`2434`)
Add NREL NSRDB PSM v4 API client to :py:mod:`pvlib.iotools`. See :py:func:`~pvlib.iotools.get_nsrdb_psm4_aggregated`, :py:func:`~pvlib.iotools.get_nsrdb_psm4_tmy`, :py:func:`~pvlib.iotools.get_nsrdb_psm4_conus`, :py:func:`~pvlib.iotools.get_nsrdb_psm4_full_disc`, and :py:func:`~pvlib.iotools.read_nsrdb_psm4`. (:issue:`2326`, :pull:`2378`, :pull:`2445`)
:py:mod:`pvlib.bifacial.infinite_sheds` no longer emits "invalid value" warnings when supplying irradiance arrays with nighttime zero values. (:issue:`2450`, :pull:`2451`)
Add 'semi_integrated' parameters for the PVsyst temperature model. (:issue:`2330`, :pull:`2415`)

Add a supporting reference to :py:func:`pvlib.atmosphere.get_relative_airmass` (:issue:`2390`, :pull:`2424`)
Document how np.nan values are handled by :py:func:`~pvlib.spectrum.average_photon_energy` (:issue:`2423`, :pull:`2426`)
Clarify which SAPM coefficients are required by the module parameter in :py:func:`~pvlib.pvsystem.sapm` (:issue:`2392`, :pull:`2435`)
Update references in :py:func:`~pvlib.irradiance.get_extra_radiation` (:issue:`2333`, :pull:`2437`)
Update references in :py:func:`~pvlib.iotools.get_cams` and :py:func:`~pvlib.iotools.read_cams` (:issue:`2427`, :pull:`2457`)

Update pyproject.toml to replace deprecated license table and classifiers. (:issue:`2440`, :pull:`2441`)