National Solar Capacity Ranking: 40th
Updated September 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.
1,085 MWdc
4 MWh
40th (39th in 2025 additions)
117,937 homes
1.26%
1,093
149 (33 Manufacturers, 57 Installers/ Developers, 59 Others)
$2.3 billion
2,218 MW over the next 5 years (ranks 32nd)
60,673
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.