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As of the first quarter of 2023,Washington State has 604 MW ofsolar power electricity generation.[1] This is an increase from about 300 MW in 2021 and 27 MW in 2013.
Washington pays afeed-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.[2][3]
The averageinsolation 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.[4]
| 
|
| Grid-Connected PV Capacity (MW)[7][8][9][10][11][12][13][14] | |||
|---|---|---|---|
| Year | Capacity | Change | % Change |
| 2007 | 1.9 | ||
| 2008 | 3.7 | 1.8 | 95% |
| 2009 | 5.2 | 1.5 | 41% |
| 2010 | 8.0 | 2.9 | 54% |
| 2011 | 12.3 | 4.2 | 54% |
| 2012 | 19.5 | 7.2 | 59% |
| 2013 | 27.4 | 7.9 | 41% |
| 2014 | 39 | 7.2 | 42% |
| 2015 | 62 | 26 | 59% |
| 2016 | 85 | 23 | 37% |
| 2017 | 105 | 20 | 23% |
| 2018 | 169 | 64 | 61% |
| 2019 | 216 | 47 | 27% |
| 2020 | 250.3 | 34.3 | 15% |
| 2021 | 297.6 | 47.3 | % |
| 2022 | 585 | 287.4 | % |
| Year | Total | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2018 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 |
| 2019 | 43 | 2 | 2 | 4 | 4 | 4 | 5 | 5 | 5 | 4 | 4 | 2 | 2 |
| 2020 | 47 | 1 | 3 | 4 | 5 | 5 | 5 | 7 | 6 | 4 | 4 | 2 | 1 |
| 2021 | 50 | 1 | 2 | 5 | 6 | 6 | 7 | 7 | 6 | 5 | 4 | 2 | 1 |
| 2022 | 83 | 1 | 3 | 5 | 5 | 6 | 6 | 7 | 6 | 4 | 13 | 14 | 11 |
| 2023 | 363 | 15 | 23 | 34 | 42 | 16 | 52 | 52 | 45 | 35 | 27 | 16 | 8 |
| 2024 | 11 | 18 |
