National Solar Capacity Ranking: 40th
Updated June 2026
SEIA’s Major Solar and Storage Projects List is a database of all U.S. ground-mounted solar projects, 1 MW and above, that are either operating, under construction or under development.
955 MWdc
4 MWh
40th (40th in 2025 additions)
103,115 homes
1.25%
1,093
149 (33 Manufacturers, 57 Installers/Developers, 59 Others)
$2.3 billion
2,119 MW over the next 5 years (ranks 33rd)
60,227
Washington’s energy storage market is in its early stage. As solar capacity and investment continue to increase, energy storage is expected to play a larger role in supporting grid reliability and enabling future clean energy growth.