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PVWatts Calculator National Renewable Energy Laboratory

NREL's PVWatts® Calculator

Estimates the energy production and cost of energy of grid-connected photovoltaic (PV) energy systems throughout the world. It allows homeowners, small building owners, installers and manufacturers to easily develop estimates of the performance of potential PV installations.
NOTICE

Due to feedback from DOE and users, we have elected to remove the incentive section from PVWatts® until further notice. The feedback was based on not being able to get consistent and up-to-date incentive data.