(resource:solar-resource)=
# Solar Resource (API)

By default, solar resource data is downloaded from the NREL Developer Network hosted National Solar Radiation Database (NSRDB) dataset [Physical Solar Model (PSM) v3.2.2](https://developer.nrel.gov/docs/solar/nsrdb/psm3-2-2-download/). Using this functionality requires an NREL API key.

```{eval-rst}
.. autoclass:: hopp.simulation.technologies.resource.solar_resource.SolarResource
    :members:
    :exclude-members: _abc_impl, check_download_dir
```