photo of Geysers Geothermal Plants
Photo by Pacific Gas & Electric NREL 00060

Due to its location on the Pacific's "ring of fire" and because of tectonic plate conjunctions, California contains the largest amount of geothermal electric generation capacity in the United States.

In 2018, geothermal energy in our state produced 11,528 gigawatt-hours (GWh) of electricity. Combined with another 700 GWh of imported geothermal power, geothermal energy produced 5.9 percent of the state's total system power. There are a total of 43 operating geothermal power plants in California with an installed capacity of 2,730 megawatts.

The largest concentration of geothermal plants is located north of San Francisco in the Geysers Geothermal Resource Area in Lake and Sonoma Counties (shown in photo on the right). This location has been producing electricity since the 1960s. It uses dry steam; one of only two places in the world for this resource (the other being in Larderello, Italy).

Contact: Michael Nyberg


Geothermal Electric Generation

YearCompany NameEIA
Plant ID
Plant ID
Plant NameState Capacity (MW) Gross MWh Net MWh
2018Bottle Rock Power LLC902T0080Bottle Rock PowerCA55.000
2018CE Turbo LLC55984T0073CE Turbo LLCCA11.579,18678,638
2018Coso Operating Company LLC10875T0009Coso Energy Developers (BLM)CA100.0342,874284,543
2018Coso Operating Company LLC10873T0010Coso Finance Partners (NAVY I)CA102.4541,402480,839
2018Coso Operating Company LLC10874T0011Coso Power Developers (NAVY II)CA100.0481,709410,115
2018Del Ranch L P10632T0012Del Ranch Company (formerly A W Hoch)CA43.2310,712273,639
2018Elmore LP10634T0015J J ElmoreCA43.2340,310306,890
2018Geysers Power Company LLC10199T0007West Ford Flat #4CA28.800
2018Geysers Power Company LLC52158T0023Aidlin #1CA22.4121,454114,167
2018Geysers Power Company LLC286HT0027Quick Silver #16CA120.0393,805353,867
2018Geysers Power Company LLC286IT0028Lakeview #17CA120.0536,581487,074
2018Geysers Power Company LLC286JT0029Socrates #18CA120.0452,583361,704
2018Geysers Power Company LLC286KT0030Grant #20CA120.0358,453332,792
2018Geysers Power Company LLC510T0046Sonoma #3CA78.0492,155439,167
2018Geysers Power Company LLC50066T0050Calistoga #19CA97.0544,581500,755
2018Geysers Power Company LLC286AT0055McCabe #5-#6CA110.0742,329707,862
2018Geysers Power Company LLC286BT0056Ridge Line #7-#8CA110.0648,889612,804
2018Geysers Power Company LLC286DT0058Eagle Rock #11CA110.0639,650604,643
2018Geysers Power Company LLC286ET0059Cobb Creek #12CA110.0350,909326,122
2018Geysers Power Company LLC286FT0060Big Geysers #13CA95.0477,320436,498
2018Geysers Power Company LLC286GT0061Sulphur Springs #14CA117.5482,661450,997
2018Heber Geothermal Co54689T0033Heber Geothermal CoCA81.5304,770229,660
2018Heber Geothermal Co54111T0051Second Imperial Geothermal Co SIGC PlantCA80.0383,324226,500
2018Hudson Ranch Energy Services LLC56791T0082John L Featherstone Plant -formerly Hudson Ranch Power I LLCCA55.0455,888415,994
2018Leathers LP10631T0034J M LeathersCA43.2360,980325,880
2018Mammoth Pacific LP10480T0035Mammoth Pacific ICA10.070,18156,406
2018Mammoth Pacific LP10481T0036Mammoth Pacific IICA15.0110,85162,425
2018Mammoth Pacific LP10479T0038Ples ICA15.0122,19085,828
2018North Brawley Geothermal56832T0081North BrawleyCA49.992,86555,669
2018Northern California Power Agency7368T0039Geothermal 1CA110.0538,699452,075
2018Northern California Power Agency7369T0040Geothermal 2CA110.0370,846352,352
2018Ormat54724T0043Ormesa Geothermal IICA24.0173,718126,895
2018Ormat50762T0066Ormesa 1HCA9.600
2018Ormat Nevada Inc54038T0021GEM IICA18.500
2018Ormat Nevada Inc10763T0022GEM IIICA26.5158,122111,404
2018Ormesa Geothermal50766T0062Ormesa ICA24.4140,34189,599
2018Salton Sea 4 Fish Lake Pwr Gen54996T0016Salton Sea Unit 4CA47.5324,109297,853
2018Salton Sea Power Generatn LP 110878T0047Salton Sea Unit 1CA10.380,67775,956
2018Salton Sea Power Generatn LP 210879T0048Salton Sea Unit 2CA19.7118,414106,516
2018Salton Sea Power Generatn LP 310759T0049Salton Sea Unit 3CA54.0357,180329,811
2018Salton Sea Power LLC55983T0017Salton Sea Unit 5CA58.3406,872360,329
2018Star Group 1E Geothermal Partn50764T0063Ormesa 1ECA14.400
2018Vulcan/BN Geothermal Power Co50210T0053VulcanCA39.7229,943203,717

Geothermal Electric Generation (Imported)

YearCompany NameEIA
Plant ID
Plant ID
Plant NameState Capacity (MW) Gross MWh Net MWh
2018Terra-Gen Dixie Valley LLC52015T0077Dixie Valley Geothermal (Nevada)NV64.7556,828495,757

Geothermal Electric Generation
(Annual Totals; Includes Imports)

Year Capacity (MW) Gross MWh Net MWh
2000 N/A N/A 13,456,000
1999 N/A N/A 13,251,000
1998 N/A N/A 12,554,000
1997 N/A N/A 11,950,000
1996 N/A N/A 13,539,000
1995 N/A N/A 14,267,000
1994 N/A N/A 15,573,000
1993 N/A N/A 15,770,000
1992 N/A N/A 16,491,000
1991 N/A N/A 15,566,000
1990 N/A N/A 16,038,000
1989 N/A N/A 15,247,000
1988 N/A N/A 14,194,000
1987 N/A N/A 14,083,000
1986 N/A N/A 13,094,000
1985 N/A N/A 10,957,000
1984 N/A N/A 9,272,000
1983 N/A N/A 7,020,000

Geothermal Electric Generation by County

County Capacity (MW) Net MWh
Churchill, NV (Imported)64.7495,757