California Independent System Operator

Balancing Authority Summary Information

California Independent System Operator is ranked #7 out of 65 balancing authorities in terms of total annual electricity generation.

Balancing Authority	California Independent System Operator
States	Arizona California Nevada
Last Update	Mar 2026
Annual Generation	179.9 TWh
Power Plants	2,075
Utilities	965
Ranked #7 out of 65 in terms of net annual generation
Ranked #8 out of 54 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 40.1% Solar \| 27.8% Water \| 12.2% Wind \| 10.2% Nuclear \| 9.7%

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Daily Net Generation for California Independent System Operator for the past 3 Years

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Plant Name	Utility	Location	Annual Generation	Plant Date	Last Update	Fuel Types
Wheelabrator Shasta	Shasta Sustainable Resource Management, Inc.	Anderson, CA	285 GWh	Sep 1987	Dec 2025	Wood/Wood Waste Solids
Salinas River Cogeneration	Salinas River Cogeneration Co	San Ardo, CA	262 GWh	Oct 1991	Dec 2025	Natural Gas
PE Berkeley	Berkeley Cogeneration Facility	Berkeley, CA	167 GWh	May 1987	Dec 2025	Natural Gas
South Belridge Cogeneration Facility	AERA Energy LLC	McKittrick, CA	469 GWh	Nov 1985	Dec 2025	Natural Gas
Southeast Kern River Cogen	Chevron USA Inc	Bakersfield, CA	44 GWh	Jan 1989	Dec 2025	Natural Gas
Municipal Cogen Plant	Palm Springs City of	Palm Springs, CA	6 GWh	Apr 1985	Dec 2025	Natural Gas
Torrance Refining Company, LLC	Torrance Refining Company, LLC	Torrance, CA	81 GWh	Aug 1983	Dec 2025	Other Gas : 66.8% Waste Heat : 33.2%
Berry Cogen Tanne Hills 18	Berry Petroleum Co	Maricopa, CA	140 GWh	Nov 1986	Dec 2025	Natural Gas
Pacific-Ultrapower Chinese Station	IHI Power Services Corp	Jamestown, CA	126 GWh	Sep 1986	Dec 2025	Wood/Wood Waste Solids : 99.6%
SRI International Cogen Project	IPT SRI Cogeneration Inc	Menlo Park, CA	24 GWh	Mar 1987	Dec 2025	Natural Gas
Mesa Wind Power LLC	Brookfield Renewable Trading and Marketing LP	North Palm Springs, CA	123 GWh	Oct 1984	Dec 2025	Wind
Painted Hills Wind Park	Terra-Gen Operating Co-Wind	Whitewater, CA	168 GWh	Oct 1985	Dec 2025	Wind
Gas Utilization Facility	City of San Diego	San Diego, CA	30 GWh	May 1985	Dec 2025	Other Biomass Gas
Oxnard	Procter&Gamble Paper Products Co-Oxnard	Oxnard, CA	482 GWh	Jun 1982	Dec 2025	Natural Gas
Oxnard Wastewater Treatment Plant	Oxnard City of	Oxnard, CA	4 GWh	Jul 1981	Dec 2025	Other Biomass Gas : 95.3% Natural Gas : 4.7%
Watson Cogeneration	ARCO Products Co-Watson	Carson, CA	2 TWh	Nov 1987	Dec 2025	Natural Gas : 76.4% Other Gas : 22.7% Waste/Other Oil : 0.9%
US Borax	U S Borax Inc	Boron, CA	274 GWh	Jun 1984	Dec 2025	Natural Gas
Calistoga Power Plant	Geysers Power Co LLC	Middletown, CA	455 GWh	Feb 1984	Dec 2025	Geothermal
San Diego State University	San Diego State University	San Diego, CA	53 GWh	Aug 2002	Dec 2025	Natural Gas : 97.3% Solar : 2.7%
Humboldt Sawmill Company	Mendocino Forest Products	Scotia, CA	107 GWh	Dec 1937	Dec 2025	Wood/Wood Waste Solids : 99.8%
Coso Power Developers	Coso Operating Co LLC	Inyokern, CA	315 GWh	Oct 1989	Dec 2025	Geothermal
Coso Finance Partners	Coso Operating Co LLC	Inyokern, CA	365 GWh	Jun 1987	Dec 2025	Geothermal
E F Oxnard Energy Facility	EF Oxnard, LLC	Oxnard, CA	5 GWh	May 1990	Dec 2025	Natural Gas
Argus Cogen Plant	Searles Valley Minerals Operations Inc.	Trona, CA	247 GWh	Nov 1947	Dec 2025	Bituminous Coal : 95.0% Natural Gas : 5.0%
Badger Creek Limited	WCAC Operating Company	Bakersfield, CA	5 GWh	Mar 1991	Dec 2025	Natural Gas
Bear Mountain Limited	WCAC Operating Company	Bakersfield, CA	36 GWh	Mar 1995	Dec 2025	Natural Gas
San Jose Cogeneration	San Jose State University Fclts Dev &Ops	San Jose, CA	35 GWh	Nov 1984	Dec 2025	Natural Gas
Kern River Cogeneration	Kern River Cogeneration Co	Bakersfield, CA	112 GWh	Jun 1985	Dec 2025	Natural Gas
Puente Hills Energy Recovery	Los Angeles County Sanitation	Whittier, CA	150 GWh	Sep 1986	Dec 2025	Landfill Gas
Lockhart Solar PV, LLC	Terra-Gen Operating Co-Solar	Hinkley, CA	243 GWh	Nov 1989	Dec 2025	Solar
New-Indy Ontario Mill	New-Indy Ontario LLC	Ontario, CA	245 GWh	May 1985	Dec 2025	Natural Gas
Greenleaf 2 Power Plant	Greenleaf Energy LLC	Yuba City, CA	37 GWh	Sep 1989	Dec 2025	Natural Gas
Marathon Bay Area Cogen	Tesoro Marketing & Refining Co. LLC (Martinez)	Martinez, CA	585 GWh	Jan 1987	Dec 2025	Natural Gas
King City Power Plant	Calpine King City Cogen LLC	King City, CA	24 GWh	Jan 1989	Dec 2025	Natural Gas
Big Creek Water Works	Big Creek Water Works Ltd	Hyampom, CA	10 GWh	Dec 1986	Dec 2025	Water
El Segundo Cogen	Chevron USA Inc-El Segundo	El Segundo, CA	1 TWh	Nov 1987	Dec 2025	Natural Gas : 99.7%
Loma Linda University Cogen	Loma Linda University	Loma Linda, CA	64 GWh	Jan 1980	Dec 2025	Natural Gas
Mammoth Pool	Southern California Edison Co	North Fork, CA	466 GWh	Feb 1960	Dec 2025	Water
California Institute of Technology	California Institute-Technology	Pasadena, CA	42 GWh	Jul 2003	Dec 2025	Natural Gas
Childrens Hospital	DTE San Diego COGEN Inc.	San Diego, CA	25 GWh	Mar 2000	Dec 2025	Natural Gas : 99.9%
James B Black	Pacific Gas & Electric Co.	Big Bend, CA	624 GWh	Nov 1965	Dec 2025	Water
Humboldt Bay	Pacific Gas & Electric Co.	Eureka, CA	348 GWh	Aug 2010	Dec 2025	Natural Gas : 99.6%
Diablo Canyon	Pacific Gas & Electric Co.	Avila Beach, CA	18 TWh	Apr 1985	Dec 2025	Nuclear
Pebbly Beach Generating Station Hybrid	Southern California Edison Co	Avalon, CA	28 GWh	Jun 1958	Dec 2025	Distillate Fuel Oil : 94.9% Gaseous Propane : 5.1%
Big Creek 3	Southern California Edison Co	Auberry, CA	674 GWh	Aug 1923	Dec 2025	Water
Big Creek 4	Southern California Edison Co	North Fork, CA	365 GWh	May 1951	Dec 2025	Water
Belden	Pacific Gas & Electric Co.	Belden, CA	243 GWh	Aug 1969	Dec 2025	Water
Middle Fork	Placer County Water Agency	Foresthill, CA	424 GWh	Sep 1966	Dec 2025	Water
Devil Canyon	California Dept. of Water Resources	San Bernardino, CA	790 GWh	Nov 1972	Dec 2025	Water
Geysers Unit 5-20	Geysers Power Co LLC	Middletown, CA	4 TWh	Mar 1971	Dec 2025	Geothermal
Dynegy Moss Landing Power Plant Hybrid	Dynegy -Moss Landing LLC	Moss Landing, CA	2 TWh	Nov 1967	Dec 2025	Natural Gas
Big Creek 2A	Southern California Edison Co	Auberry, CA	259 GWh	Jul 1928	Dec 2025	Water
Edward C Hyatt	California Dept. of Water Resources	Oroville, CA	2 TWh	Feb 1968	Dec 2025	Water
Thermalito	California Dept. of Water Resources	Oroville, CA	322 GWh	Jan 1968	Dec 2025	Water
Kaweah Delta District Hospital	Kaweah Delta Hospital	Visalia, CA	22 GWh	Sep 2008	Dec 2025	Natural Gas
Caribou 2	Pacific Gas & Electric Co.	Belden, CA	442 GWh	Oct 1958	Dec 2025	Water
Encina Water Pollution Control	Encina Joint Powers Authority	Carlsbad, CA	14 GWh	Oct 2008	Dec 2025	Other Biomass Gas : 93.6% Natural Gas : 6.4%
Electra	Pacific Gas & Electric Co.	Jackson, CA	291 GWh	May 1948	Dec 2025	Water
Mountainview Generating Station	Southern California Edison Co	Redlands, CA	1 TWh	Nov 2005	Dec 2025	Natural Gas
Rock Creek	Pacific Gas & Electric Co.	Storrie, CA	598 GWh	Feb 1950	Dec 2025	Water
Geothermal 1	Northern California Power Agny	Middletown, CA	338 GWh	Dec 1982	Dec 2025	Geothermal
Geothermal 2	Northern California Power Agny	Middletown, CA	322 GWh	Nov 1985	Dec 2025	Geothermal
Poe	Pacific Gas & Electric Co.	Storrie, CA	361 GWh	Sep 1958	Dec 2025	Water
Dion R Holm	City & County of San Francisco	Groveland, CA	578 GWh	Jul 1960	Dec 2025	Water
Pit 7	Pacific Gas & Electric Co.	Montgomery Creek, CA	439 GWh	Aug 1965	Dec 2025	Water
R C Kirkwood	City & County of San Francisco	Groveland, CA	400 GWh	Jan 1967	Dec 2025	Water
Solano Wind	Sacramento Municipal Util Dist	Rio Vista, CA	770 GWh	May 1994	Dec 2025	Wind
Pit 5	Pacific Gas & Electric Co.	Big Bend, CA	541 GWh	Mar 1944	Dec 2025	Water
Pit 4	Pacific Gas & Electric Co.	Big Bend, CA	397 GWh	Jun 1955	Dec 2025	Water
Moccasin	City & County of San Francisco	Moccasin, CA	277 GWh	Jul 1969	Dec 2025	Water
Kerckhoff 2	Pacific Gas & Electric Co.	Auberry, CA	419 GWh	Apr 1983	Dec 2025	Water
W Plant	Qualcomm Incorporated	San Diego, CA	28 GWh	Jun 2005	Nov 2025	Natural Gas
Dynegy Oakland Power Plant	Dynegy Oakland, LLC	Oakland, CA	2 GWh	Oct 1978	Nov 2025	Jet Fuel
Western Power & Steam Inc	Western Power and Steam II LLC	Bakersfield, CA	27 GWh	Feb 1990	Nov 2025	Natural Gas
Chalk Cliff Limited	WCAC Operating Company	Bakersfield, CA	3 GWh	Feb 1990	Nov 2025	Natural Gas
Haas	Pacific Gas & Electric Co.	Balch Camp, CA	208 GWh	Nov 1958	Nov 2025	Water
Sycamore Cogeneration	Sycamore Cogeneration Co	Bakersfield, CA	219 GWh	Nov 1987	Nov 2025	Natural Gas
McKittrick Limited	WCAC Operating Company	Bakersfield, CA	5 GWh	Sep 1991	Nov 2025	Natural Gas
AES Alamitos LLC	AES Alamitos LLC	Long Beach, CA	28 GWh	Aug 1956	Oct 2025	Natural Gas
AES Huntington Beach LLC	AES Huntington Beach LLC	Huntington Beach, CA	6 GWh	May 1958	Oct 2025	Natural Gas
Colgate	Yuba County Water Agency	Dobbins, CA	1 TWh	Sep 1969	Oct 2025	Water
Henrietta Peaker	MRP San Joaquin Energy LLC.	Lemoore, CA	4 GWh	May 2002	Oct 2025	Natural Gas
Goal Line LP	Goal Line LP	Escondido, CA	8 GWh	Jul 1994	Sep 2025	Natural Gas
Hanford Energy Park Peaker	MRP San Joaquin Energy LLC.	Hanford, CA	6 GWh	Aug 2001	Sep 2025	Natural Gas
Berry Cogen	Berry Petroleum Co	Taft, CA	8 GWh	Nov 1986	Sep 2025	Natural Gas
Pine Flat	Kings River Conservation Dist	Piedra, CA	331 GWh	Dec 1983	Sep 2025	Water
AltaGas Ripon Energy Inc.	AltaGas Ripon Energy Inc.	Ripon, CA	2 GWh	Mar 1988	Sep 2025	Natural Gas
Ormond Beach	Ormond Beach Power, LLC	Oxnard, CA	43 GWh	Jul 1971	Aug 2025	Natural Gas
Irwindale Brew Yard, LLC	Irwindale Brew Yard, LLC	Irwindale, CA	517 MWh	Jan 2002	Apr 2025	Solar : 99.8%
Laguna Water Reclamation Facility	City of Santa Rosa	Santa Rosa, CA	11 GWh	Feb 2013	Dec 2024	Other Biomass Gas : 85.8% Natural Gas : 14.2%
Valley Center 1	MN8 Energy LLC	Valley Center, CA	4 GWh	Nov 2013	Dec 2024	Solar
Las Virgenes Municipal Water District	Tesla Inc.	Calabasas, CA	2 GWh	Jan 2014	Dec 2024	Solar
White River Solar 2	Consolidated Edison Development Inc.	Alpaugh, CA	48 GWh	Aug 2014	Dec 2024	Solar
Henrietta Solar Project	Southern Power Co	Lemoore, CA	218 GWh	Jul 2016	Dec 2024	Solar
RE Camelot LLC	Onward Energy	Mojave, CA	125 GWh	Nov 2014	Dec 2024	Solar
RE Adams East, LLC	Onward Energy	Fresno, CA	39 GWh	Nov 2014	Dec 2024	Solar
RE Kansas Solar, LLC	Onward Energy	Lemoore, CA	36 GWh	Nov 2014	Dec 2024	Solar
RE Old River One, LLC	Onward Energy	Bakersfield, CA	36 GWh	Nov 2014	Dec 2024	Solar
RE Columbia Two, LLC	Onward Energy	Mojave, CA	40 GWh	Nov 2014	Dec 2024	Solar
RE Kent South, LLC	Onward Energy	Lemoore, CA	44 GWh	Nov 2014	Dec 2024	Solar

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#26	Arizona Public Service Company	24.1 TWh	92
#55	Arlington Valley, LLC	3.0 TWh	1
#37	Balancing Authority of Northern California	14.4 TWh	87
#48	Imperial Irrigation District	6.4 TWh	66
#31	Los Angeles Department of Water and Power	18.3 TWh	124
#22	Nevada Power Company	37.3 TWh	139
#64	New Harquahala Generating Company, LLC	107.5 GWh	1
#19	Salt River Project Agricultural Improvement and Power District	60.3 TWh	48
#57	Turlock Irrigation District	2.0 TWh	11
#39	Western Area Power Administration - Desert Southwest Region	10.0 TWh	33

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#3	Electric Reliability Council of Texas, Inc.	484.9 TWh	1,313
#5	Southwest Power Pool	300.1 TWh	835
#6	Southern Company Services, Inc. - Trans	250.9 TWh	417
#7	California Independent System Operator	179.9 TWh	2,075
#9	Tennessee Valley Authority	162.4 TWh	204
#10	Florida Power & Light Co.	150.5 TWh	187
#12	New York Independent System Operator	134.0 TWh	1,211
#13	Duke Energy Carolinas	112.4 TWh	565
#15	ISO New England	110.5 TWh	1,577
#16	Bonneville Power Administration	85.9 TWh	163