How many solar farms are in Washington?

Washington has 10 operating utility-scale solar farms with 0.3 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest solar farm in Washington?

Lund Hill Solar in Klickitat County, Washington is the largest, at 150 MW. It came online in 2022.

How many solar farms were built in Washington in 2025?

0 solar farms came online in Washington in 2025, with 0 MW of capacity.

Who is developing solar farms in Washington?

Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.

Solar farms in Washington

Washington has 10 operating solar farms with 0.3 GW of capacity.

Operating10

See planned solar farms in Washington

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

Washington had 1 solar farms online in 2016 and 10 in 2026

2016’162017’172018’182019’192020’202021’212022’222023’232024’242025’252026’26

Solar farms online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest solar farms in Washington

Operating, by capacity

#	Solar farm	County	Year online	Capacity
1	Lund Hill Solar	Klickitat County	2022	150 MW
2	Ostrea Solar, LLC	Yakima County	2026	80 MW
3	Goose Prairie Solar	Yakima County	2024	80 MW
4	Adams Nielson Solar	Adams County	2018	19 MW
5	Urtica Solar Project	Kittitas County	2022	5 MW
6	Penstemon Solar Project	Kittitas County	2022	5 MW
7	Camas Solar Project	Kittitas County	2022	5 MW
8	Horn Rapids Solar, Storage and Training	Benton County	2020	3 MW
9	Wild Horse	Kittitas County	2007	1 MW
10	Arlington Microgrid	Snohomish County	2019	1 MW

Solar farms that came online most recently in Washington

Newest first

#	Solar farm	County	Year online	Capacity
1	Ostrea Solar, LLC	Yakima County	2026	80 MW
2	Goose Prairie Solar	Yakima County	2024	80 MW
3	Urtica Solar Project	Kittitas County	2022	5 MW
4	Lund Hill Solar	Klickitat County	2022	150 MW
5	Camas Solar Project	Kittitas County	2022	5 MW
6	Penstemon Solar Project	Kittitas County	2022	5 MW
7	Horn Rapids Solar, Storage and Training	Benton County	2020	3 MW
8	Arlington Microgrid	Snohomish County	2019	1 MW
9	Adams Nielson Solar	Adams County	2018	19 MW
10	Wild Horse	Kittitas County	2007	1 MW

The developer behind each project is on paid plans. See plans

How Cleanview tracks solar farms

Operating solar farms come from the EIA's monthly survey of power plants. Planned projects come from the grid operators' interconnection queues. We research who is developing each one, since a queue lists a project company, not its owner.

Questions about solar farms in Washington

How many solar farms are in Washington?: Washington has 10 operating utility-scale solar farms with 0.3 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest solar farm in Washington?: Lund Hill Solar in Klickitat County, Washington is the largest, at 150 MW. It came online in 2022.
How many solar farms were built in Washington in 2025?: 0 solar farms came online in Washington in 2025, with 0 MW of capacity.
Who is developing solar farms in Washington?: Interconnection queues list each project under a project company, not the developer behind it. Cleanview researches the developer of every project and has them on paid plans.