How many geothermal power plants are in the US?

The US has 67 operating utility-scale geothermal power plants with 4.1 GW of capacity, according to the EIA's monthly survey of power plants.

What is the largest geothermal power plant in the US?

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 the US in 2025?

2 geothermal power plants came online in the US in 2025, with 35 MW of capacity.

Who is developing geothermal power plants in the US?

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 the United States

The US has 67 operating geothermal power plants with 4.1 GW of capacity. 2 came online in 2025.

Operating67

Updated monthly. Last updated November 2026.

Under 50 MW50–249 MW250 MW and up

Updated monthly. Last updated November 2026.

The US had 48 geothermal power plants online in 2016 and 67 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 the US

Operating, by capacity

#	Geothermal power plant	Location	Year online	Capacity
1	Geysers Unit 5-20	Sonoma County, California	1985	1,236 MW
2	Calistoga Power Plant	Lake County, California	1984	176 MW
3	Geothermal 1	Sonoma County, California	1983	110 MW
4	Geothermal 2	Sonoma County, California	1986	110 MW
5	McGinness Hills	Lander County, Nevada	2023	104 MW
6	McGinness Hills 3	Lander County, Nevada	2021	99 MW
7	Coso Finance Partners	Inyo County, California	1988	92 MW
8	Heber Geothermal	Imperial County, California	2023	92 MW
9	Coso Power Developers	Inyo County, California	1989	90 MW
10	Coso Energy Developers	Inyo County, California	1989	90 MW

Geothermal power plants that came online most recently in the US

Newest first

#	Geothermal power plant	Location	Year online	Capacity
1	Cape Generating Station	Beaver County, Utah	2026	43 MW
2	Raft River Geothermal Power Plant	Cassia County, Idaho	2025	16 MW
3	Ormesa I	Imperial County, California	2025	19 MW
4	Beowawe	Lander County, Nevada	2024	29 MW
5	Heber Geothermal	Imperial County, California	2023	92 MW
6	McGinness Hills	Lander County, Nevada	2023	104 MW
7	North Valley	Washoe County, Nevada	2023	32 MW
8	Second Imperial Geothermal	Imperial County, California	2022	75 MW
9	Star Peak Geothermal Plant	Pershing County, Nevada	2022	22 MW
10	CD4	Mono County, California	2022	44 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 the US

How many geothermal power plants are in the US?: The US has 67 operating utility-scale geothermal power plants with 4.1 GW of capacity, according to the EIA's monthly survey of power plants.
What is the largest geothermal power plant in the US?: 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 the US in 2025?: 2 geothermal power plants came online in the US in 2025, with 35 MW of capacity.
Who is developing geothermal power plants in the US?: 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.