NREL National Renewable Energy Laboratory API Documentation
The National Renewable Energy Laboratory's developer network helps developers access and use energy data via Web services, including renewable energy and alternative fuel data.
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Alternative Fuel Stations
NREL's PVWatts calculates the energy production of grid-connected photovoltaic (PV) energy systems. This service estimates the performance of hypothetical residential and small commercial PV installations. Version 4 is the current version of the PVWatts API. Previous versions have been deprecated and its users are encouraged to migrate to this newly enhanced version.