As of the first quarter of 2023, Washington State has 604 MW of solar power electricity generation. This is an increase from about 300 MW in 2021 and 27 MW in 2013.
Washington pays a feed-in tariff of up to $5,000/year of 15 cents/kWh, which is increased by a factor of 2.4 if the panels are made in the state and by an additional 1.2 if the inverters are made in state.
The average insolation in Washington's two largest cities are as follows.
In the charts, a peak sun hour is one kilowatt-hour per square meter of solar irradiance.