California Independent System Operator

Balancing Authority Summary Information

California Independent System Operator is ranked #7 out of 64 balancing authorities in terms of total annual electricity generation.

Balancing Authority	California Independent System Operator
States	Arizona California Nevada New Mexico
Last Update	Oct 2026
Annual Generation	168.7 TWh
Power Plants	2,170
Utilities	1,001
Ranked #7 out of 64 in terms of net annual generation
Ranked #14 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 32% Solar \| 30.9% Water \| 12.2% Wind \| 11.8% Nuclear \| 11.2% Coal \| 0%

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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
Thermalito Diverson Dam	California Dept. of Water Resources	Oroville, CA	10 GWh	Jun 1987	Dec 2025	Water
Coso Finance Partners	Coso Operating Co LLC	Inyokern, CA	357 GWh	Jun 1987	Jul 2026	Geothermal
Nacimiento Hydro Project	Monterey Cnty Water Res Agency	Bradley, CA	12 GWh	Jun 1987	Dec 2025	Water
PE Berkeley	Berkeley Cogeneration Facility	Berkeley, CA	134 GWh	May 1987	Jun 2026	Natural Gas
Lake Mendocino	City of Ukiah - (CA)	Ukiah, CA	12 GWh	Apr 1987	Dec 2025	Water
SRI International Cogen Project	IPT SRI Cogeneration Inc	Menlo Park, CA	24 GWh	Mar 1987	Jul 2026	Natural Gas
Bidwell Ditch Project	Mega Renewables	Hat Creek, CA	12 GWh	Feb 1987	Dec 2025	Water
Marathon Bay Area Cogen	Tesoro Marketing & Refining Co. LLC (Martinez)	Martinez, CA	598 GWh	Jan 1987	Jul 2026	Natural Gas
Big Creek Water Works	Big Creek Water Works Ltd	Hyampom, CA	6 GWh	Dec 1986	May 2026	Water
East Portal Generator	Calleguas Mun Water District	Chatsworth, CA	5 GWh	Dec 1986	Dec 2025	Water
Difwind Farms Ltd VI	Terra-Gen Operating Co-Wind	Mojave, CA	13 GWh	Dec 1986	Dec 2025	Wind
Montgomery Creek Hydro	Central Rivers Power US, LLC	Montgomery Creek, CA	9 GWh	Dec 1986	Dec 2025	Water
H. Gonzales	City of Vernon - (CA)	Vernon, CA	29 MWh	Dec 1986	Dec 2025	Natural Gas
Newcastle	Pacific Gas & Electric Co.	Auburn, CA	6 GWh	Nov 1986	Dec 2025	Water
Roaring Creek Water Power	Shasta Hydroelectric Inc	Montgomery Creek, CA	6 GWh	Nov 1986	Dec 2025	Water
Hatchet Creek Project	Mega Renewables	Montgomery Creek, CA	22 GWh	Nov 1986	Dec 2025	Water
Sierra Pacific Quincy Facility	Sierra Pacific Industries	Quincy, CA	202 GWh	Nov 1986	Dec 2025	Wood/Wood Waste Solids
Berry Cogen	Berry Petroleum Co	Taft, CA	9 GWh	Nov 1986	May 2026	Natural Gas
Berry Cogen Tanne Hills 18	Berry Petroleum Co	Maricopa, CA	138 GWh	Nov 1986	Jul 2026	Natural Gas
TPC Windfarms LLC	Terra-Gen Operating Co-Wind	Mojave, CA	42 GWh	Nov 1986	Dec 2025	Wind
Helzel & Schwarzhoff 86	Wind Stream Operations LLC	Tehachapi, CA	3 GWh	Nov 1986	Dec 2024	Wind
Puente Hills Energy Recovery	Los Angeles County Sanitation	Whittier, CA	145 GWh	Sep 1986	Jul 2026	Landfill Gas
Sierra Pacific Burney Facility	Sierra Pacific Industries	Burney, CA	95 GWh	Sep 1986	Dec 2025	Wood/Wood Waste Solids
Pacific-Ultrapower Chinese Station	IHI Power Services Corp	Jamestown, CA	101 GWh	Sep 1986	Jul 2026	Wood/Wood Waste Solids : 98.0% Gaseous Propane : 2.0%
Coalinga 25D Cogen	Chevron USA Inc	Coalinga, CA	39 GWh	Sep 1986	Dec 2025	Natural Gas
Bowman	Nevada Irrigation District	Nevada City, CA	14 GWh	Aug 1986	Dec 2025	Water
Alamo	California Dept. of Water Resources	Pearblossom, CA	66 GWh	Jun 1986	Dec 2025	Water
Cymric 6Z Cogen	Chevron USA Inc	McKittrick, CA	27 GWh	Jun 1986	Dec 2025	Natural Gas
Bear Valley	City of Escondido - (CA)	Escondido, CA	3 GWh	May 1986	Aug 2025	Water
Gianera	City of Santa Clara - (CA)	Santa Clara, CA	15 GWh	May 1986	Dec 2025	Natural Gas
Alameda	Northern California Power Agny	Alameda, CA	3 GWh	Apr 1986	Dec 2025	Natural Gas
Sand Bar Power Plant	Tri-Dam Power Authority	Stanislaus Ntl. Fores, CA	83 GWh	Apr 1986	Dec 2025	Water
Toadtown	Pacific Gas & Electric Co.	Magalia, CA	2 GWh	Mar 1986	Oct 2025	Water
Stony Gorge	City of Santa Clara - (CA)	Elk Creek, CA	9 GWh	Mar 1986	Dec 2025	Water
Whitewater Hydro Plant	Desert Water Agency	California, CA	5 GWh	Mar 1986	Dec 2025	Water
San Dimas Wash Generating Station	San Gabriel Valley Mun Wtr Dt	San Dimas, CA	1 GWh	Feb 1986	Sep 2025	Water
Oxnard Paper Mill	New-Indy, Oxnard LLC	Oxnard, CA	183 GWh	Feb 1986	Jul 2026	Natural Gas
Lodi	Northern California Power Agny	Lodi, CA	2 GWh	Jan 1986	Dec 2025	Natural Gas
Total Energy Facilities	Los Angeles County Sanitation	Carson, CA	157 GWh	Dec 1985	Dec 2025	Other Biomass Gas : 94.7% Natural Gas : 5.3%
Geothermal 2	Northern California Power Agny	Middletown, CA	324 GWh	Nov 1985	Jul 2026	Geothermal
Sunray 3	Sunray Energy 3 LLC	Daggett, CA	37 GWh	Nov 1985	Dec 2025	Solar
Collins Pine Project	Collins Pine Co	Chester, CA	15 GWh	Nov 1985	Dec 2025	Wood/Wood Waste Solids
South Belridge Cogeneration Facility	AERA Energy LLC	McKittrick, CA	475 GWh	Nov 1985	Jul 2026	Natural Gas
Coram Energy LLC (4.5MW)	Nextera Energy Resources	Tehachapi, CA	9 GWh	Nov 1985	Dec 2025	Wind
ZCO	Wind Stream Operations LLC	Tehachapi, CA	1 GWh	Nov 1985	Dec 2024	Wind
Painted Hills Wind Park	Terra-Gen Operating Co-Wind	Whitewater, CA	161 GWh	Oct 1985	Jul 2026	Wind
Lost Hills Cogeneration Plant	AERA Energy LLC	Lost Hills, CA	8 GWh	Sep 1985	Dec 2025	Natural Gas
WWTP Power Generation Station	East Bay Municipal Util Dist - (CA)	Oakland, CA	32 GWh	Jul 1985	Jul 2026	Other Biomass Gas : 98.9% Distillate Fuel Oil : 1.1%
Kern River Cogeneration	Kern River Cogeneration Co	Bakersfield, CA	105 GWh	Jun 1985	Jul 2026	Natural Gas
New-Indy Ontario Mill	New-Indy Ontario LLC	Ontario, CA	244 GWh	May 1985	Jul 2026	Natural Gas
Gas Utilization Facility	City of San Diego - (CA)	San Diego, CA	27 GWh	May 1985	Jul 2026	Other Biomass Gas
Diablo Canyon	Pacific Gas & Electric Co.	Avila Beach, CA	18 TWh	Apr 1985	Jul 2026	Nuclear
Municipal Cogen Plant	Palm Springs, City of - (CA)	Palm Springs, CA	8 GWh	Apr 1985	Jul 2026	Natural Gas
Friant Hydro Facility	Friant Power Authority	Friant, CA	73 GWh	Mar 1985	Dec 2025	Water
Sacramento Municipal Util Dist	South Sutter Water District	Sacramento, CA	14 GWh	Jan 1985	Dec 2025	Water
Scott Flat	Nevada Irrigation District	Nevada City, CA	4 GWh	Jan 1985	Oct 2025	Water
Site 980 65	Madera-Chowchilla Power Auth	Madera, CA	2 GWh	Jan 1985	Jun 2025	Water
Karen Avenue Wind Farm	San Gorgonio Farms Inc	North Palm Springs, CA	26 GWh	Dec 1984	Dec 2025	Wind
San Antonio Regional Hospital	San Antonio Regional Hospital	Upland, CA	13 GWh	Dec 1984	Dec 2025	Natural Gas
85 A	Wind Wall 1 LLC	Tehachapi, CA	71 GWh	Dec 1984	Dec 2025	Wind
85 B	Wind Wall 1 LLC	Tehachapi, CA	93 GWh	Dec 1984	Dec 2025	Wind
Tehachapi Wind Resource I	CalWind Resources Inc	Tehachapi, CA	12 GWh	Nov 1984	Dec 2025	Wind
Sunray 2	Sunray Energy 2, LLC	Daggett, CA	55 GWh	Nov 1984	Dec 2025	Solar
Mammoth G1	Ormat Nevada Inc	Mammoth lakes, CA	44 GWh	Nov 1984	Dec 2025	Geothermal
San Jose Cogeneration	San Jose State University Fclts Dev &Ops	San Jose, CA	35 GWh	Nov 1984	Jul 2026	Natural Gas
Cameron Ridge LLC	Terra-Gen Operating Co-Wind	Mojave, CA	148 GWh	Nov 1984	Dec 2025	Wind
Three Forks Water Power Project	Grizzly Mountain Ranch	Zenia, CA	3 GWh	Nov 1984	Dec 2024	Water
Mesa Wind Power LLC	Mesa Wind Power LLC	North Palm Springs, CA	117 GWh	Oct 1984	Jul 2026	Wind
US Borax	U S Borax Inc	Boron, CA	263 GWh	Jun 1984	Jul 2026	Natural Gas
Combie South	Nevada Irrigation District	Auburn, CA	4 GWh	Mar 1984	Dec 2025	Water
Calistoga Power Plant	Geysers Power Co LLC	Middletown, CA	454 GWh	Feb 1984	Jul 2026	Geothermal
Pine Flat	Kings River Conservation Dist	Piedra, CA	333 GWh	Dec 1983	Jul 2026	Water
Ridgetop Energy LLC	Terra-Gen Operating Co-Wind	Mojave, CA	24 GWh	Dec 1983	Dec 2025	Wind
Sonoma California Geothermal	Geysers Power Co LLC	Middletown, CA	436 GWh	Nov 1983	Dec 2025	Geothermal
East Winds Project	Terra-Gen Operating Co-Wind	Palm Springs, CA	6 GWh	Nov 1983	Dec 2025	Wind
Indian Valley Dam Hydro Project	Yolo County Flood Control WCD	Clearlake Oaks, CA	11 GWh	Sep 1983	Aug 2025	Water
CP Kelco San Diego Plant	CP Kelco US Inc.	San Diego, CA	75 GWh	Sep 1983	Jul 2026	Natural Gas
Torrance Refining Company, LLC	Torrance Refining Company, LLC	Torrance, CA	68 GWh	Aug 1983	Jul 2026	Other Gas : 56.6% Waste Heat : 43.4%
Corona	Metropolitan Water District of S CA	Corona, CA	13 GWh	Jul 1983	Apr 2025	Water
Grossmont Hospital	Sharp Grossmont Hospital	La Mesa, CA	29 GWh	Jul 1983	Dec 2025	Natural Gas
Temescal	Metropolitan Water District of S CA	Corona, CA	14 GWh	Jun 1983	Apr 2025	Water
Camanche	East Bay Municipal Util Dist - (CA)	Clements & Wallace, CA	17 GWh	Jun 1983	Dec 2025	Water
Sly Creek	South Feather Water and Power Agency	Forbestown, CA	27 GWh	Jun 1983	Dec 2025	Water
Monticello Dam	Solano Irrigation District	Winters, CA	41 GWh	May 1983	Dec 2025	Water
Gosselin Hydro Plant	Humboldt Bay Mun Water Dist	Ruth, CA	5 GWh	May 1983	Dec 2025	Water
Kerckhoff 2	Pacific Gas & Electric Co.	Auberry, CA	450 GWh	Apr 1983	Jul 2026	Water
Frankenheimer Power Plant	Turlock Irrigation District	Oakdale, CA	11 GWh	Feb 1983	Dec 2025	Water
San Gorgonio Farms Wind Farm	San Gorgonio Farms Inc	Whitewater, CA	52 GWh	Feb 1983	Dec 2025	Wind
Geothermal 1	Northern California Power Agny	Middletown, CA	307 GWh	Dec 1982	Jul 2026	Geothermal
W E Warne	California Dept. of Water Resources	Gorman, CA	211 GWh	Oct 1982	Dec 2025	Water
B Braun Medical	B Braun Medical Inc	Irvine, CA	29 GWh	Oct 1982	Mar 2025	Natural Gas
Cymric 36W Cogen	Chevron USA Inc	McKittrick, CA	53 GWh	Sep 1982	Dec 2025	Natural Gas
Oxnard	Procter&Gamble Paper Products Co-Oxnard	Oxnard, CA	422 GWh	Jun 1982	Jul 2026	Natural Gas
Taft 26C Cogen	Chevron USA Inc	Taft, CA	46 GWh	Jun 1982	Jul 2026	Natural Gas
Oak Creek Energy Systems I	Terra-Gen Operating Co-Wind	Mojave, CA	57 GWh	May 1982	Dec 2025	Wind
Parker	Merced Irrigation District	Snelling, CA	6 GWh	Mar 1982	Jun 2025	Water
Victory Garden (Tehachapi)	Wind Stream Operations LLC	Tehachapi, CA	33 GWh	Nov 1981	Dec 2024	Wind
Volta 2	Pacific Gas & Electric Co.	Manton, CA	4 GWh	Oct 1981	Dec 2025	Water
Yorba Linda	Metropolitan Water District of S CA	Yorba Linda, CA	9 GWh	Oct 1981	Nov 2025	Water
Oxnard Wastewater Treatment Plant	City of Oxnard - (CA)	Oxnard, CA	3 GWh	Jul 1981	Jul 2026	Other Biomass Gas : 99.9%

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#25	Arizona Public Service Company	25.8 TWh	102
#55	Arlington Valley, LLC	3.2 TWh	1
#38	Balancing Authority of Northern California	13.9 TWh	91
#49	Imperial Irrigation District	6.2 TWh	66
#29	Los Angeles Department of Water and Power	19.3 TWh	132
#22	Nevada Power Company	38.6 TWh	143
#51	PUD No. 1 of Douglas County	4.4 TWh	5
#19	Salt River Project Agricultural Improvement and Power District	60.5 TWh	51
#57	Turlock Irrigation District	1.9 TWh	11
#39	Western Area Power Administration - Desert Southwest Region	10.6 TWh	36

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#3	Electric Reliability Council of Texas, Inc.	506.3 TWh	1,487
#5	Southwest Power Pool	314.5 TWh	876
#6	Southern Company Services, Inc. - Trans	259.3 TWh	423
#7	California Independent System Operator	168.7 TWh	2,170
#9	Tennessee Valley Authority	166.2 TWh	209
#10	Florida Power & Light Co.	153.0 TWh	188
#12	New York Independent System Operator	134.1 TWh	1,334
#13	Duke Energy Carolinas	113.4 TWh	578
#15	ISO New England	112.2 TWh	1,667
#16	Bonneville Power Administration	91.1 TWh	170