How many solar farms are in Washington?

8, with 348 MW of nameplate capacity between them, spread over 5 counties. That is the EIA-860M operating count for 2026-07.

Is there a map of Washington solar farms?

Yes — the map above. Each dot is one solar farm, sized by nameplate capacity and placed at the coordinates EIA files for it.

Which is the largest solar farm in Washington?

Lund Hill Solar, at 150 MW. The table is sorted largest first, so the rest follow it.

Is there a solar farm near me in Washington?

The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.

Which grid operator runs Washington's solar farms?

No single ISO or RTO covers most of them. EIA files each plant against its own balancing authority, which in Washington is largely a vertically integrated utility rather than an organised market.

How current is this, and what is left out?

EIA-860M for 2026-07. Solar photovoltaic and solar thermal, with and without storage. Utility-scale only: EIA-860M starts at 1 MW, so rooftop solar is not here. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.

Solar Farms in Washington

Every operating solar farm in Washington on EIA-860M for 2026-07: 8 plants, 9 generating units and 348 MW of nameplate capacity across 5 counties.

As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m

Plants: 8; 9 generating units
Nameplate capacity: 348 MW
Counties: 5
Grid operator: Mixed; no single ISO covers a majority

Map of solar farms in Washington

Every one of the 8 plants is drawn at the coordinate EIA files for it.

Loading map…

Solar · 8

List of solar farms in Washington

Sort by any column. Capacity is nameplate, summed across every generating unit EIA lists at the site.

solar farms in Washington

Lund Hill SolarSolar Photovoltaic	Avangrid Power LLC	Klickitat	150	1	2022	Operating
Ostrea Solar, LLCSolar Photovoltaic	Cypress Creek Renewables	Yakima	80	1	2026	Operating
Goose Prairie SolarSolar Photovoltaic	Goose Prairie Solar LLC	Yakima	80	1	2024	Operating
Adams Nielson SolarSolar Photovoltaic	Strata Manager, LLC	Adams	19.2	1	2018	Operating
Urtica Solar ProjectSolar Photovoltaic	Altus Power America Management, LLC	Kittitas	5	1	2022	Operating
Penstemon Solar ProjectSolar Photovoltaic	Altus Power America Management, LLC	Kittitas	5	1	2022	Operating
Camas Solar ProjectSolar Photovoltaic	Altus Power America Management, LLC	Kittitas	5	1	2022	Operating
Horn Rapids Solar, Storage and Training2 technologies	Energy Northwest	Benton	4.2	2	2020	Operating

Largest solar farms in Washington

1Lund Hill SolarKlickitat County, Washington150 MW
2Ostrea Solar, LLCYakima County, Washington80 MW
3Goose Prairie SolarYakima County, Washington80 MW
4Adams Nielson SolarAdams County, Washington19.2 MW
5Urtica Solar ProjectKittitas County, Washington5 MW
6Penstemon Solar ProjectKittitas County, Washington5 MW
7Camas Solar ProjectKittitas County, Washington5 MW
8Horn Rapids Solar, Storage and TrainingBenton County, Washington4.2 MW

Solar farms by county in Washington

The county EIA files against each plant. It is the fastest way to find the plant nearest a given town.

County	Plants	Nameplate MW
Yakima	2	160
Klickitat	1	150
Adams	1	19.2
Kittitas	3	15
Benton	1	4.2

Solar Farms in Washington: FAQ

How many solar farms are in Washington?: 8, with 348 MW of nameplate capacity between them, spread over 5 counties. That is the EIA-860M operating count for 2026-07.
Is there a map of Washington solar farms?: Yes — the map above. Each dot is one solar farm, sized by nameplate capacity and placed at the coordinates EIA files for it.
Which is the largest solar farm in Washington?: Lund Hill Solar, at 150 MW. The table is sorted largest first, so the rest follow it.
Is there a solar farm near me in Washington?: The county roll-up below groups every plant by county, which is the quickest way to find the one closest to a given town.
Which grid operator runs Washington's solar farms?: No single ISO or RTO covers most of them. EIA files each plant against its own balancing authority, which in Washington is largely a vertically integrated utility rather than an organised market.
How current is this, and what is left out?: EIA-860M for 2026-07. Solar photovoltaic and solar thermal, with and without storage. Utility-scale only: EIA-860M starts at 1 MW, so rooftop solar is not here. Plants below 1 MW are not surveyed by EIA and so are absent; retirements and additions after 2026-07 arrive with the next monthly release.