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	May 2025
Annual Generation	189.5 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 \| 43.6% Solar \| 24.8% Water \| 11.6% Wind \| 10.8% 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
North Sky River Energy LLC	North Sky River Energy LLC	Weldon, CA	387 GWh	Nov 2012	Dec 2023	Wind
RE Garland	Southern Power Co	Rosamond, CA	384 GWh	Oct 2016	Dec 2023	Solar
Maverick Solar, LLC	Maverick Solar, LLC	Desert Center, CA	379 GWh	Nov 2020	Feb 2025	Solar
Mammoth Pool	Southern California Edison Co	North Fork, CA	379 GWh	Feb 1960	Feb 2025	Water
Chestnut	Chestnut Westside, LLC	Lemoore, CA	378 GWh	Nov 2023	Feb 2025	Solar : 95.4%
Solar Gen 2 Solar Facility	Southern Power Co	Calipatria, CA	377 GWh	Oct 2014	Dec 2023	Solar
Pit 4	Pacific Gas & Electric Co.	Big Bend, CA	374 GWh	Jun 1955	Feb 2025	Water
Coso Finance Partners	Coso Operating Co LLC	Inyokern, CA	372 GWh	Jun 1987	Feb 2025	Geothermal
James B Black	Pacific Gas & Electric Co.	Big Bend, CA	370 GWh	Nov 1965	Feb 2025	Water
Belden	Pacific Gas & Electric Co.	Belden, CA	365 GWh	Aug 1969	Nov 2024	Water
Alta Wind Energy Center I	Alta Wind Energy Center I	Mojave, CA	361 GWh	Dec 2010	Dec 2023	Wind
Big Creek 4	Southern California Edison Co	North Fork, CA	359 GWh	May 1951	Feb 2025	Water
Humboldt Bay	Pacific Gas & Electric Co.	Eureka, CA	357 GWh	Aug 2010	Feb 2025	Natural Gas : 99.4% Distillate Fuel Oil : 0.6%
Malburg	City of Vernon	Vernon, CA	356 GWh	Sep 2005	Feb 2025	Natural Gas
Caribou 2	Pacific Gas & Electric Co.	Belden, CA	353 GWh	Oct 1958	Feb 2025	Water
Big Creek 2A	Southern California Edison Co	Auberry, CA	352 GWh	Jul 1928	Feb 2025	Water
Geothermal 1	Northern California Power Agny	Middletown, CA	352 GWh	Dec 1982	Feb 2025	Geothermal
Wright Solar Park	Wright Solar Park LLC	Los Banos, CA	350 GWh	Nov 2019	Feb 2025	Solar
Blythe Solar III, LLC Hybrid	Blythe Solar III, LLC	Blythe, CA	349 GWh	Apr 2020	Feb 2025	Solar
Copper Mountain Solar 2	Consolidated Edison Development Inc.	Boulder City, NV	349 GWh	Jun 2012	Dec 2023	Solar
Donnells	Oakdale&South San Joaquin Irrigation D.	None, CA	348 GWh	May 1957	Dec 2023	Water
Imperial Valley Solar, LLC	Imperial Valley Solar, LLC	Calexico, CA	346 GWh	Oct 2013	Dec 2023	Solar
Pit 3	Pacific Gas & Electric Co.	Burney, CA	345 GWh	Jun 1925	Dec 2023	Water
Edwards Sanborn E1B	Terra-Gen Operating Co-Hybrid	Mojave, CA	345 GWh	Oct 2022	Feb 2025	Solar
Thermalito	California Dept. of Water Resources	Oroville, CA	344 GWh	Jan 1968	Feb 2025	Water
BigBeau Solar, LLC	Big Beau Solar, LLC	Rosamond, CA	343 GWh	Jan 2022	Feb 2025	Solar
Geothermal 2	Northern California Power Agny	Middletown, CA	340 GWh	Nov 1985	Feb 2025	Geothermal
Blythe Solar II, LLC	Blythe Solar II, LLC	Blythe, CA	337 GWh	Jun 2016	Feb 2025	Solar
Alta Wind X	Alta Wind X, LLC	Mojave, CA	337 GWh	Dec 2013	Dec 2023	Wind
Stanislaus	Pacific Gas & Electric Co.	Vallecito, CA	334 GWh	Feb 1963	Dec 2023	Water
American Kings Solar, LLC	MN8 Energy LLC	Lemoore, CA	332 GWh	Nov 2020	Feb 2025	Solar
Edwards Sanborn E1A	Terra-Gen Operating Co-Hybrid	Mojave, CA	331 GWh	Jul 2022	Feb 2025	Solar
Tule Wind LLC	Avangrid Renewables LLC	Boulevard, CA	331 GWh	Nov 2017	Feb 2025	Wind
Fifth Standard Solar PV, LLC (Hybrid)	RWE Renewables Americas, LLC	Huron, CA	329 GWh	Aug 2023	Feb 2025	Solar
Campo Verde Solar	Southern Power Co	El Centro, CA	329 GWh	Sep 2013	Dec 2023	Solar
Sentinel Energy Center, LLC	Sentinel Energy Center LLC	Desert Hot Springs, CA	327 GWh	Apr 2013	Feb 2025	Natural Gas
Stockton Biomass	DTE Stockton LLC	Stockton, CA	326 GWh	Nov 1987	Dec 2023	Wood/Wood Waste Solids : 99.6%
Scarlet Solar (CA)	EDP Renewables North America LLC	Fresno, CA	326 GWh	-	Feb 2025	Solar
THUMS	THUMS Long Beach Company	Long Beach, CA	325 GWh	Dec 2002	Feb 2025	Natural Gas
CA Flats Solar 150, LLC	Arevon Energy, Inc.	Shandon, CA	324 GWh	Jan 2019	Feb 2025	Solar
Proxima	Proxima Solar, LLC	Crows Landing, CA	317 GWh	-	Feb 2025	Solar
Drew Solar LLC	Drew Solar LLC	Calexico, CA	311 GWh	Oct 2022	Feb 2025	Solar
Pit 7	Pacific Gas & Electric Co.	Montgomery Creek, CA	310 GWh	Aug 1965	Feb 2025	Water
Coso Power Developers	Coso Operating Co LLC	Inyokern, CA	309 GWh	Oct 1989	Feb 2025	Geothermal
Dixie Valley	Ormat Nevada Inc	Fallon, NV	309 GWh	May 1988	Feb 2025	Geothermal
Sun Streams 2	Sun Streams 2, LLC	Hassayampa, AZ	307 GWh	May 2021	Feb 2025	Solar
Blythe Solar IV, LLC	Blythe Solar IV, LLC	Blythe, CA	304 GWh	Oct 2020	Feb 2025	Solar
Alta Wind Energy Center III	Alta Wind Energy Center III	Mojave, CA	303 GWh	Jan 2011	Dec 2023	Wind
Edwards Sanborn E4	Terra-Gen Operating Co-Hybrid	Mojave, CA	300 GWh	Nov 2022	Feb 2025	Solar
Maverick Solar 7, LLC	Maverick Solar 7, LLC	Desert Center, CA	300 GWh	Nov 2021	Feb 2025	Solar
Alta Wind Energy Center II	Alta Wind Energy Center II	Mojave, CA	300 GWh	Dec 2010	Dec 2023	Wind
Raceway Solar & Storage	AES Clean Energy	Lancaster, CA	299 GWh	-	Feb 2025	Solar
Edwards Sanborn E2	Terra-Gen Operating Co-Hybrid	Mojave, CA	297 GWh	Nov 2021	Feb 2025	Solar
Big Creek 2	Southern California Edison Co	Auberry, CA	296 GWh	Nov 1913	Dec 2023	Water
Shiloh IV Wind Project LLC	EDF Renewable Asset Holdings, Inc.	Birds Landing, CA	294 GWh	Nov 2012	Dec 2023	Wind
Valentine Solar, LLC	EDF Renewable Asset Holdings, Inc.	Rosamond, CA	292 GWh	Oct 2019	Feb 2025	Solar
Panoche Valley Solar Farm	Consolidated Edison Development Inc.	Paicines, CA	292 GWh	Dec 2017	Feb 2025	Solar
Wistaria Ranch Solar	Consolidated Edison Development Inc.	Calexico, CA	292 GWh	Nov 2018	Feb 2025	Solar
Phillips 66 Rodeo Refinery	Phillips 66 Company	Rodeo, CA	291 GWh	Apr 1987	Aug 2024	Other Gas : 72.8% Natural Gas : 27.2%
Hudson - High Desert Hybrid	MN8 Energy LLC	Victorville, CA	286 GWh	Nov 2021	Feb 2025	Solar
Arlington Energy Center III	Arlington Energy Center III	Blythe, CA	284 GWh	Jul 2022	Feb 2025	Solar
Ivanpah 2	NRG Energy Services	Nipton, CA	283 GWh	Nov 2013	Feb 2025	Solar : 95.7% Natural Gas : 4.3%
Mesquite Solar 2, LLC	Consolidated Edison Development Inc.	Tonopah, AZ	283 GWh	Nov 2016	Feb 2025	Solar
Mountain View I & II	AES Distributed Energy	North Palm Springs, CA	278 GWh	May 2001	Feb 2025	Wind
Pit 6	Pacific Gas & Electric Co.	Montgomery Creek, CA	278 GWh	Jul 1965	Oct 2023	Water
Coso Energy Developers	Coso Operating Co LLC	Inyokern, CA	277 GWh	Nov 1988	Dec 2023	Geothermal
Imperial Solar Energy Center South	CSOLAR IV South LLC	Calexico, CA	277 GWh	Oct 2013	Dec 2023	Solar
Narrows 2	Yuba County Water Agency	Browns Valley, CA	277 GWh	Nov 1969	Dec 2023	Water
Wheelabrator Shasta	Shasta Sustainable Resource Management, Inc.	Anderson, CA	276 GWh	Sep 1987	Feb 2025	Wood/Wood Waste Solids
Shiloh III Wind Project LLC	EDF Renewable Asset Holdings, Inc.	Birds Landing, CA	276 GWh	Nov 2011	Dec 2023	Wind
Moccasin	City & County of San Francisco	Moccasin, CA	275 GWh	Jul 1969	Feb 2025	Water
Ivanpah 3	NRG Energy Services	Nipton, CA	275 GWh	Nov 2013	Feb 2025	Solar : 95.9% Natural Gas : 4.1%
Sycamore Cogeneration	Sycamore Cogeneration Co	Bakersfield, CA	273 GWh	Nov 1987	Feb 2025	Natural Gas
Midway Sunset Cogen	Midway-Sunset Cogeneration Co	Fellows, CA	273 GWh	Apr 1989	Feb 2025	Natural Gas
CD4	CD4	Mammoth Lakes, CA	272 GWh	Jun 2022	Dec 2023	Geothermal
Drum 2	Pacific Gas & Electric Co.	Alta, CA	271 GWh	Nov 1965	Dec 2023	Water
Mt Poso Cogeneration	Mt Poso Cogeneration Co	Bakersfield, CA	268 GWh	Apr 1989	Sep 2023	Wood/Wood Waste Solids : 99.5% Natural Gas : 0.5%
US Borax	U S Borax Inc	Boron, CA	267 GWh	Jun 1984	Feb 2025	Natural Gas
Sunshine Valley Solar	EDP Renewables North America LLC	Armagosa, NV	266 GWh	Nov 2019	Feb 2025	Solar
Pacific Wind LLC	EDF Renewable Asset Holdings, Inc.	Rosamond, CA	264 GWh	Jul 2012	Dec 2023	Wind
Electra	Pacific Gas & Electric Co.	Jackson, CA	263 GWh	May 1948	Feb 2025	Water
Catalina Solar LLC	EDF Renewable Asset Holdings, Inc.	Rosamond, CA	263 GWh	Nov 2012	Dec 2023	Solar
Rising Tree Wind Farm III	Rising Tree Wind Farm III LLC	Mojave, CA	262 GWh	May 2015	Dec 2023	Wind
Argus Cogen Plant	Searles Valley Minerals Operations Inc.	Trona, CA	260 GWh	Nov 1947	Feb 2025	Bituminous Coal : 93.4% Natural Gas : 6.6%
Carlsbad Energy Center	NRG California Peaker Operations LLC	Carlsbad, CA	257 GWh	Nov 2018	Feb 2025	Natural Gas
Salinas River Cogeneration	Salinas River Cogeneration Co	San Ardo, CA	257 GWh	Oct 1991	Feb 2025	Natural Gas
AES Redondo Beach LLC	AES Redondo Beach LLC	Redondo Beach, CA	256 GWh	Sep 1954	Dec 2023	Natural Gas
Rabbitbrush Solar, LLC	Leeward Asset Management, LLC	Rosamond, CA	256 GWh	Sep 2022	Feb 2025	Solar : 99.9%
Antelope Expansion 2	AES Distributed Energy	Lancaster, CA	255 GWh	Nov 2018	Feb 2025	Solar
Exchequer	Merced Irrigation District	Snelling, CA	251 GWh	Jun 1967	Dec 2023	Water
San Pablo Raceway	AES Distributed Energy	Lancaster, CA	250 GWh	Jul 2019	Feb 2025	Solar
Hatchet Ridge Wind Project	Pattern Operators LP	Burney, CA	248 GWh	Nov 2010	Dec 2023	Wind
Pinyon Pine I	Pinyon Pines Wind I, LLC	Mojave, CA	248 GWh	Oct 2012	Dec 2023	Wind
Mustang Hills LLC	Mustang Hills, LLC (Longroad)	Mojave, CA	248 GWh	Apr 2012	Dec 2023	Wind
Golden Hills Wind	Golden Hills Wind, LLC	Livermore, CA	248 GWh	Nov 2015	Dec 2023	Wind
Alta Wind XI	Alta Wind XI, LLC	Mojave, CA	248 GWh	Dec 2013	Dec 2023	Wind
New-Indy Ontario Mill	New-Indy Ontario LLC	Ontario, CA	247 GWh	May 1985	Feb 2025	Natural Gas
Tiger Creek	Pacific Gas & Electric Co.	Pioneer, CA	246 GWh	May 1931	Dec 2023	Water
Maverick Solar 6, LLC	Maverick Solar 6, LLC	Desert Center, CA	246 GWh	Oct 2021	Feb 2025	Solar : 99.8%
Brea Expansion Plant	Brea Power II	Brea, CA	244 GWh	Oct 2012	Feb 2025	Landfill Gas

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#27	Arizona Public Service Company	22.7 TWh	75
#55	Arlington Valley, LLC	3.3 TWh	1
#36	Balancing Authority of Northern California	15.0 TWh	83
#48	Imperial Irrigation District	5.8 TWh	65
#33	Los Angeles Department of Water and Power	17.4 TWh	120
#22	Nevada Power Company	38.1 TWh	136
#54	New Harquahala Generating Company, LLC	3.6 TWh	1
#18	Salt River Project Agricultural Improvement and Power District	58.5 TWh	45
#58	Turlock Irrigation District	2.1 TWh	11
#42	Western Area Power Administration - Desert Southwest Region	8.3 TWh	30

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#3	Electric Reliability Council of Texas, Inc.	474.5 TWh	1,139
#5	Southwest Power Pool	296.3 TWh	762
#6	Southern Company Services, Inc. - Trans	252.3 TWh	393
#7	California Independent System Operator	189.5 TWh	1,943
#8	Tennessee Valley Authority	158.9 TWh	170
#10	Florida Power & Light Co.	148.5 TWh	159
#12	New York Independent System Operator	130.9 TWh	1,100
#13	Duke Energy Carolinas	111.3 TWh	556
#15	ISO New England	103.6 TWh	1,487
#16	Bonneville Power Administration	83.0 TWh	158