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	Jun 2025
Annual Generation	190.4 TWh
Power Plants	1,943
Utilities	893
Ranked #7 out of 65 in terms of net annual generation
Ranked #7 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 44% Solar \| 24.9% Water \| 11.3% Wind \| 10.6% Nuclear \| 9.7%

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

Plant Name	Utility	Location	Annual Generation	Plant Date	Last Update	Fuel Types
Drum 2	Pacific Gas & Electric Co.	Alta, CA	271 GWh	Nov 1965	Dec 2023	Water
James B Black	Pacific Gas & Electric Co.	Big Bend, CA	380 GWh	Nov 1965	Mar 2025	Water
French Meadows	Placer County Water Agency	Foresthill, CA	67 GWh	Sep 1966	Dec 2023	Water
Middle Fork	Placer County Water Agency	Foresthill, CA	458 GWh	Sep 1966	Mar 2025	Water
Oxbow (CA)	Placer County Water Agency	Foresthill, CA	14 GWh	Sep 1966	Dec 2023	Water
Ralston	Placer County Water Agency	Foresthill, CA	460 GWh	Sep 1966	Dec 2023	Water
R C Kirkwood	City & County of San Francisco	Groveland, CA	417 GWh	Jan 1967	Mar 2025	Water
Exchequer	Merced Irrigation District	Snelling, CA	251 GWh	Jun 1967	Dec 2023	Water
Dynegy Moss Landing Power Plant Hybrid	Dynegy -Moss Landing LLC	Moss Landing, CA	3 TWh	Nov 1967	Mar 2025	Natural Gas
Thermalito	California Dept. of Water Resources	Oroville, CA	340 GWh	Jan 1968	Mar 2025	Water
Edward C Hyatt	California Dept. of Water Resources	Oroville, CA	2 TWh	Feb 1968	Mar 2025	Water
Altamont Gas Recovery	WM Renewable Energy LLC	Livermore, CA	39 GWh	Feb 1969	Dec 2023	Landfill Gas
Moccasin	City & County of San Francisco	Moccasin, CA	278 GWh	Jul 1969	Mar 2025	Water
Belden	Pacific Gas & Electric Co.	Belden, CA	365 GWh	Aug 1969	Nov 2024	Water
Colgate	Yuba County Water Agency	Dobbins, CA	1 TWh	Sep 1969	Mar 2025	Water
Narrows 2	Yuba County Water Agency	Browns Valley, CA	277 GWh	Nov 1969	Dec 2023	Water
Geysers Unit 5-20	Geysers Power Co LLC	Middletown, CA	4 TWh	Mar 1971	Mar 2025	Geothermal
Ormond Beach	Ormond Beach Power, LLC	Oxnard, CA	45 GWh	Jul 1971	Mar 2025	Natural Gas
Devil Canyon	California Dept. of Water Resources	San Bernardino, CA	750 GWh	Nov 1972	Mar 2025	Water
Panoche Peaker	Wellhead Services, Inc	Firebaugh, CA	2 GWh	Jul 1973	Dec 2023	Natural Gas
Ellwood	Ellwood Power, LLC	Goleta, CA	4 GWh	Jul 1974	Dec 2023	Natural Gas
Glenarm	City of Pasadena - (CA)	Pasadena, CA	41 GWh	Dec 1975	Dec 2023	Natural Gas
Dominguez Plant	Eco Services Corp.	Long Beach, CA	14 GWh	Jul 1976	Dec 2023	Waste Heat
Long Beach Generation LLC	Long Beach Generation LLC	Long Beach, CA	10 GWh	Nov 1976	Dec 2023	Natural Gas
Martinez Sulfuric Acid Regeneration Plt	Eco Services Corp.	Martinez, CA	16 GWh	Dec 1977	Dec 2023	Waste Heat
Dynegy Oakland Power Plant	Dynegy Oakland, LLC	Oakland, CA	2 GWh	Oct 1978	Mar 2025	Jet Fuel
Coleman PH	Pacific Gas & Electric Co.	Anderson, CA	34 GWh	May 1979	Dec 2023	Water
South	Pacific Gas & Electric Co.	Manton, CA	18 GWh	Nov 1979	Dec 2023	Water
Loma Linda University Cogen	Loma Linda University	Loma Linda, CA	62 GWh	Jan 1980	Mar 2025	Natural Gas
Rollins	Nevada Irrigation District	Colfax, CA	73 GWh	Jul 1980	Dec 2023	Water
Foothill Feeder	Metropolitan Water District of S CA	Castaic, CA	20 GWh	Mar 1981	Dec 2023	Water
San Dimas	Metropolitan Water District of S CA	San Dimas, CA	25 GWh	May 1981	Nov 2023	Water
Oxnard Wastewater Treatment Plant	Oxnard City of	Oxnard, CA	5 GWh	Jul 1981	Mar 2025	Other Biomass Gas : 93.4% Natural Gas : 6.6%
Volta 2	Pacific Gas & Electric Co.	Manton, CA	3 GWh	Oct 1981	Dec 2023	Water
Victory Garden (Tehachapi)	Wind Stream Operations LLC	Tehachapi, CA	25 GWh	Nov 1981	Dec 2023	Wind
Santa Clara Cogen	City of Santa Clara - (CA)	Santa Clara, CA	15 GWh	May 1982	Dec 2023	Natural Gas
Oak Creek Energy Systems I	Terra-Gen Operating Co-Wind	Mojave, CA	38 GWh	May 1982	Dec 2023	Wind
Oxnard	Procter&Gamble Paper Products Co-Oxnard	Oxnard, CA	484 GWh	Jun 1982	Mar 2025	Natural Gas
Taft 26C Cogen	Chevron USA Inc	Taft, CA	52 GWh	Jun 1982	Mar 2025	Natural Gas
Cymric 36W Cogen	Chevron USA Inc	McKittrick, CA	54 GWh	Sep 1982	Dec 2023	Natural Gas
W E Warne	California Dept. of Water Resources	Gorman, CA	217 GWh	Oct 1982	Dec 2023	Water
B Braun Medical	B Braun Medical Inc	Irvine, CA	27 GWh	Oct 1982	Dec 2023	Natural Gas
Geothermal 1	Northern California Power Agny	Middletown, CA	389 GWh	Dec 1982	Mar 2025	Geothermal
San Gorgonio Farms Wind Farm	San Gorgonio Farms Inc	Whitewater, CA	62 GWh	Feb 1983	Dec 2023	Wind
Perris	Metropolitan Water District of S CA	Perris, CA	5 GWh	Apr 1983	Dec 2023	Water
Kerckhoff 2	Pacific Gas & Electric Co.	Auberry, CA	416 GWh	Apr 1983	Mar 2025	Water
Monticello Dam	Solano Irrigation District	Winters, CA	32 GWh	May 1983	Dec 2023	Water
Temescal	Metropolitan Water District of S CA	Corona, CA	7 GWh	Jun 1983	Dec 2023	Water
Camanche	East Bay Municipal Util Dist	Clements & Wallace, CA	58 GWh	Jun 1983	Dec 2023	Water
Sly Creek	South Feather Water and Power Agency	Forbestown, CA	41 GWh	Jun 1983	Dec 2023	Water
Corona	Metropolitan Water District of S CA	Corona, CA	4 GWh	Jul 1983	Dec 2023	Water
Grossmont Hospital	Sharp Grossmont Hospital	La Mesa, CA	27 GWh	Jul 1983	Dec 2023	Natural Gas
Torrance Refining Company, LLC	Torrance Refining Company, LLC	Torrance, CA	75 GWh	Aug 1983	Mar 2025	Other Gas : 80.9% Waste Heat : 19.1%
CP Kelco San Diego Plant	CP Kelco US Inc.	San Diego, CA	76 GWh	Sep 1983	Mar 2025	Natural Gas
Sonoma California Geothermal	Geysers Power Co LLC	Middletown, CA	432 GWh	Nov 1983	Dec 2023	Geothermal
East Winds Project	Terra-Gen Operating Co-Wind	Palm Springs, CA	5 GWh	Nov 1983	Dec 2023	Wind
Terra-Gen VG Wind LLC	Terra-Gen Operating Co-Wind	Tehachapi, CA	5 GWh	Dec 1983	Dec 2023	Wind
Pine Flat	Kings River Conservation Dist	Piedra, CA	449 GWh	Dec 1983	Mar 2025	Water
Ridgetop Energy LLC	Terra-Gen Operating Co-Wind	Mojave, CA	31 GWh	Dec 1983	Dec 2023	Wind
Calistoga Power Plant	Geysers Power Co LLC	Middletown, CA	468 GWh	Feb 1984	Mar 2025	Geothermal
Combie South	Nevada Irrigation District	Auburn, CA	7 GWh	Mar 1984	Dec 2023	Water
US Borax	U S Borax Inc	Boron, CA	271 GWh	Jun 1984	Mar 2025	Natural Gas
Tehachapi Wind Resource I	CalWind Resources Inc	Tehachapi, CA	13 GWh	Nov 1984	Dec 2023	Wind
Sunray 2	Sunray Energy 2, LLC	Daggett, CA	57 GWh	Nov 1984	Dec 2023	Solar
Mammoth G1	Ormat Nevada Inc	Mammoth lakes, CA	58 GWh	Nov 1984	Dec 2023	Geothermal
San Jose Cogeneration	San Jose State University Fclts Dev &Ops	San Jose, CA	34 GWh	Nov 1984	Mar 2025	Natural Gas
Cameron Ridge LLC	Terra-Gen Operating Co-Wind	Mojave, CA	125 GWh	Nov 1984	Dec 2023	Wind
Three Forks Water Power Project	Grizzly Mountain Ranch	Zenia, CA	3 GWh	Nov 1984	Dec 2023	Water
San Antonio Regional Hospital	San Antonio Regional Hospital	Upland, CA	11 GWh	Dec 1984	Dec 2023	Natural Gas
Karen Avenue Wind Farm	San Gorgonio Farms Inc	North Palm Springs, CA	29 GWh	Dec 1984	Dec 2023	Wind
85 B	Wind Wall 1 LLC	Tehachapi, CA	87 GWh	Dec 1984	Dec 2023	Wind
85 A	Wind Wall 1 LLC	Tehachapi, CA	63 GWh	Dec 1984	Dec 2023	Wind
Site 980 65	Madera-Chowchilla Power Auth	Madera, CA	6 GWh	Jan 1985	Nov 2023	Water
Friant Hydro Facility	Friant Power Authority	Friant, CA	106 GWh	Mar 1985	Dec 2023	Water
Diablo Canyon	Pacific Gas & Electric Co.	Avila Beach, CA	18 TWh	Apr 1985	Mar 2025	Nuclear
Municipal Cogen Plant	Palm Springs City of	Palm Springs, CA	7 GWh	Apr 1985	Mar 2025	Natural Gas
Gas Utilization Facility	City of San Diego	San Diego, CA	32 GWh	May 1985	Mar 2025	Other Biomass Gas
Red Mountain	Metropolitan Water District of S CA	Fallbrook, CA	23 GWh	May 1985	Dec 2023	Water
New-Indy Ontario Mill	New-Indy Ontario LLC	Ontario, CA	246 GWh	May 1985	Mar 2025	Natural Gas
Kern River Cogeneration	Kern River Cogeneration Co	Bakersfield, CA	238 GWh	Jun 1985	Jan 2025	Natural Gas
WWTP Power Generation Station	East Bay Municipal Util Dist	Oakland, CA	30 GWh	Jul 1985	Mar 2025	Other Biomass Gas : 98.8% Distillate Fuel Oil : 1.2%
Lost Hills Cogeneration Plant	AERA Energy LLC	Lost Hills, CA	3 GWh	Sep 1985	Dec 2023	Natural Gas
Painted Hills Wind Park	Terra-Gen Operating Co-Wind	Whitewater, CA	171 GWh	Oct 1985	Mar 2025	Wind
Collins Pine Project	Collins Pine Co	Chester, CA	8 GWh	Nov 1985	Nov 2023	Wood/Wood Waste Solids
South Belridge Cogeneration Facility	AERA Energy LLC	McKittrick, CA	476 GWh	Nov 1985	Mar 2025	Natural Gas
Geothermal 2	Northern California Power Agny	Middletown, CA	303 GWh	Nov 1985	Mar 2025	Geothermal
ZCO	Wind Stream Operations LLC	Tehachapi, CA	1 GWh	Nov 1985	Dec 2023	Wind
Sunray 3	Sunray Energy 3 LLC	Daggett, CA	33 GWh	Nov 1985	Dec 2023	Solar
Total Energy Facilities	Los Angeles County Sanitation	Carson, CA	169 GWh	Dec 1985	Dec 2023	Other Biomass Gas : 79.6% Natural Gas : 20.4%
Lodi	Northern California Power Agny	Lodi, CA	546 MWh	Jan 1986	Dec 2023	Natural Gas
San Dimas Wash Generating Station	San Gabriel Valley Mun Wtr Dt	San Dimas, CA	3 GWh	Feb 1986	Dec 2023	Water
Oxnard Paper Mill	New-Indy, Oxnard LLC	Oxnard, CA	192 GWh	Feb 1986	Mar 2025	Natural Gas
Toadtown	Pacific Gas & Electric Co.	Magalia, CA	3 GWh	Mar 1986	Dec 2023	Water
Stony Gorge	City of Santa Clara - (CA)	Elk Creek, CA	13 GWh	Mar 1986	Dec 2023	Water
Whitewater Hydro Plant	Desert Water Agency	California, CA	3 GWh	Mar 1986	Dec 2023	Water
Alameda	Northern California Power Agny	Alameda, CA	4 GWh	Apr 1986	Dec 2023	Natural Gas
Sand Bar Power Plant	Tri-Dam Power Authority	Stanislaus Ntl. Fores, CA	124 GWh	Apr 1986	Dec 2023	Water
Gianera	City of Santa Clara - (CA)	Santa Clara, CA	10 GWh	May 1986	Dec 2023	Natural Gas
Bear Valley	City of Escondido - (CA)	Escondido, CA	3 GWh	May 1986	Dec 2023	Water
Cymric 6Z Cogen	Chevron USA Inc	McKittrick, CA	37 GWh	Jun 1986	Dec 2023	Natural Gas

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#26	Arizona Public Service Company	23.0 TWh	75
#55	Arlington Valley, LLC	3.4 TWh	1
#35	Balancing Authority of Northern California	15.1 TWh	83
#48	Imperial Irrigation District	5.9 TWh	65
#33	Los Angeles Department of Water and Power	17.7 TWh	120
#22	Nevada Power Company	38.2 TWh	136
#54	New Harquahala Generating Company, LLC	3.5 TWh	1
#18	Salt River Project Agricultural Improvement and Power District	58.7 TWh	45
#58	Turlock Irrigation District	2.1 TWh	11
#44	Western Area Power Administration - Desert Southwest Region	8.1 TWh	30

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#3	Electric Reliability Council of Texas, Inc.	476.4 TWh	1,139
#5	Southwest Power Pool	297.0 TWh	762
#6	Southern Company Services, Inc. - Trans	252.0 TWh	393
#7	California Independent System Operator	190.4 TWh	1,943
#8	Tennessee Valley Authority	158.8 TWh	170
#10	Florida Power & Light Co.	148.6 TWh	159
#12	New York Independent System Operator	130.6 TWh	1,100
#13	Duke Energy Carolinas	111.4 TWh	556
#15	ISO New England	103.1 TWh	1,487
#16	Bonneville Power Administration	82.1 TWh	158