How many geothermal power plants are in California?

California has 32 operating utility-scale geothermal power plants with 2.9 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest geothermal power plant in California?

Geysers Unit 5-20 in Sonoma County, California is the largest, at 1,236 MW. It came online in 1985.

How many geothermal power plants were built in California in 2025?

1 geothermal power plant came online in California in 2025, with 19 MW of capacity.

Who is developing geothermal power plants in California?

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.

Geothermal power plants in California

California has 32 operating geothermal power plants with 2.9 GW of capacity. 1 came online in 2025.

Operating32

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

California had 27 geothermal power plants online in 2016 and 32 in 2026

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

Geothermal power plants online at the end of each year. Source: EIA-860M, compiled by Cleanview.

The 10 largest geothermal power plants in California

Operating, by capacity

#	Geothermal power plant	County	Year online	Capacity
1	Geysers Unit 5-20	Sonoma County	1985	1,236 MW
2	Calistoga Power Plant	Lake County	1984	176 MW
3	Geothermal 1	Sonoma County	1983	110 MW
4	Geothermal 2	Sonoma County	1986	110 MW
5	Coso Finance Partners	Inyo County	1988	92 MW
6	Heber Geothermal	Imperial County	2023	92 MW
7	Coso Power Developers	Inyo County	1989	90 MW
8	Coso Energy Developers	Inyo County	1989	90 MW
9	North Brawley Geothermal Plant	Imperial County	2009	80 MW
10	Sonoma California Geothermal	Lake County	1983	78 MW

Geothermal power plants that came online most recently in California

Newest first

#	Geothermal power plant	County	Year online	Capacity
1	Ormesa I	Imperial County	2025	19 MW
2	Heber Geothermal	Imperial County	2023	92 MW
3	Second Imperial Geothermal	Imperial County	2022	75 MW
4	CD4	Mono County	2022	44 MW
5	Ormesa III	Imperial County	2020	46 MW
6	John L. Featherstone Plant	Imperial County	2012	55 MW
7	North Brawley Geothermal Plant	Imperial County	2009	80 MW
8	Ormesa II	Imperial County	2007	24 MW
9	CE Turbo LLC	Imperial County	2000	12 MW
10	Salton Sea Power LLC - Unit 5	Imperial County	2000	58 MW

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

How Cleanview tracks geothermal power plants

Operating geothermal power plants 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 geothermal power plants in California

How many geothermal power plants are in California?: California has 32 operating utility-scale geothermal power plants with 2.9 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest geothermal power plant in California?: Geysers Unit 5-20 in Sonoma County, California is the largest, at 1,236 MW. It came online in 1985.
How many geothermal power plants were built in California in 2025?: 1 geothermal power plant came online in California in 2025, with 19 MW of capacity.
Who is developing geothermal power plants in California?: 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.