National Solar Capacity Ranking: 47th
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.
350 MWdc
47th (44th in 2025 additions)
58,975 homes
74.80%
394
176 (6 Manufacturers, 21 Installers/Developers, 149 Others)
$937 million
298 MW over the next 5 years (ranks 48th)
20,952
Washington, DC’s energy storage market remains in an early stage, with limited deployment despite strong solar penetration across the district.
As solar adoption continues to expand, energy storage is expected to play a larger role in supporting grid reliability and enhancing system flexibility, particularly in a highly distributed, urban energy environment.