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
Oaks HOA	Onyx Asset Services Group	Ione, CA	2 GWh	Mar 2025	Dec 2025	Solar
SeaWorld Aquatica	Onyx Asset Services Group	Chula Vista, CA	2 GWh	Apr 2018	Dec 2025	Solar
Plant No 1 Orange County	Orange County Sanitation Dist - (CA)	Fountain Valley, CA	41 GWh	May 1993	Dec 2025	Other Biomass Gas : 81.6% Natural Gas : 18.4%
Plant No 2 Orange County	Orange County Sanitation Dist - (CA)	Huntington Beach, CA	47 GWh	May 1993	Dec 2025	Other Biomass Gas : 77.2% Natural Gas : 22.8%
Orange Grove Peaking Facility	Orange Grove Energy LP	Pala, CA	9 GWh	May 2010	Dec 2025	Natural Gas
OES Biogas Power	Organic Energy Solutions, Inc.	San Bernardino, CA	904 MWh	-	Dec 2025	Other Biomass Gas
Orion Solar I	Orion Solar I LLC	Arvin, CA	27 GWh	Mar 2014	Dec 2025	Solar
Orion Solar II	Orion Solar II, LLC	Arvin, CA	16 GWh	May 2014	Dec 2025	Solar
Dixie Valley	Ormat Nevada Inc	Fallon, NV	469 GWh	May 1988	Jul 2026	Geothermal
Mammoth G2	Ormat Nevada Inc	Mammoth Lakes, CA	84 GWh	Nov 1990	Dec 2025	Geothermal
Mammoth G1	Ormat Nevada Inc	Mammoth lakes, CA	44 GWh	Nov 1984	Dec 2025	Geothermal
Mammoth G3	Ormat Nevada Inc	Mammoth Lakes, CA	75 GWh	Nov 1990	Dec 2025	Geothermal
Ormond Beach	Ormond Beach Power, LLC	Oxnard, CA	18 GWh	Jul 1971	Jul 2026	Natural Gas
Otay Mesa Generating Project	Otay Mesa Energy Center LLC	San Diego, CA	1 TWh	Sep 2009	Jul 2026	Natural Gas
P66 Rodeo Solar	P66 Rodeo Solar	Rodeo, CA	57 GWh	Mar 2023	Jul 2026	Solar
Preferred Freezer San Leandro	Pacific Gas & Electric Co.	San Leandro, CA	3 GWh	Jun 2017	Dec 2025	Solar
Bucks Creek	Pacific Gas & Electric Co.	Storrie, CA	192 GWh	Feb 1928	Dec 2025	Water
Caribou 2	Pacific Gas & Electric Co.	Belden, CA	491 GWh	Oct 1958	Jul 2026	Water
Caribou 1	Pacific Gas & Electric Co.	Belden, CA	276 GWh	May 1921	Dec 2025	Water
Hat Creek 2	Pacific Gas & Electric Co.	Burney, CA	46 GWh	Aug 1921	Dec 2025	Water
Humboldt Bay	Pacific Gas & Electric Co.	Eureka, CA	312 GWh	Aug 2010	Jul 2026	Natural Gas : 99.4% Distillate Fuel Oil : 0.6%
Butt Valley	Pacific Gas & Electric Co.	Belden, CA	145 GWh	Nov 1958	Dec 2025	Water
James B Black	Pacific Gas & Electric Co.	Big Bend, CA	504 GWh	Nov 1965	Jul 2026	Water
Spring Gap	Pacific Gas & Electric Co.	Long Barn, CA	12 GWh	Aug 1921	Dec 2025	Water
Belden	Pacific Gas & Electric Co.	Belden, CA	430 GWh	Aug 1969	Jul 2026	Water
Balch 2	Pacific Gas & Electric Co.	Balch Camp, CA	342 GWh	Oct 1958	Dec 2025	Water
A G Wishon	Pacific Gas & Electric Co.	North Fork, CA	24 GWh	Aug 1910	Oct 2025	Water
Wise	Pacific Gas & Electric Co.	Auburn, CA	30 GWh	Feb 1917	Dec 2025	Water
West Point PH	Pacific Gas & Electric Co.	Pioneer, CA	18 GWh	Oct 1948	Dec 2025	Water
Tiger Creek	Pacific Gas & Electric Co.	Pioneer, CA	216 GWh	May 1931	Dec 2025	Water
Stanislaus	Pacific Gas & Electric Co.	Vallecito, CA	200 GWh	Feb 1963	Dec 2025	Water
Volta 1	Pacific Gas & Electric Co.	Manton, CA	21 GWh	Mar 1980	Dec 2025	Water
Hat Creek 1	Pacific Gas & Electric Co.	Burney, CA	32 GWh	Jul 1921	Dec 2025	Water
Halsey	Pacific Gas & Electric Co.	Auburn, CA	22 GWh	Nov 1916	Dec 2025	Water
Haas	Pacific Gas & Electric Co.	Balch Camp, CA	174 GWh	Nov 1958	Jul 2026	Water
Electra	Pacific Gas & Electric Co.	Jackson, CA	257 GWh	May 1948	Jul 2026	Water
Coleman PH	Pacific Gas & Electric Co.	Anderson, CA	31 GWh	May 1979	Dec 2025	Water
Cresta	Pacific Gas & Electric Co.	Storrie, CA	342 GWh	Oct 1949	Dec 2025	Water
De Sabla	Pacific Gas & Electric Co.	Magalia, CA	21 GWh	Jan 1963	Dec 2025	Water
Dutch Flat	Pacific Gas & Electric Co.	Alta, CA	66 GWh	Feb 1943	Dec 2025	Water
Drum 1	Pacific Gas & Electric Co.	Alta, CA	15 GWh	Oct 1913	Dec 2025	Water
Newcastle	Pacific Gas & Electric Co.	Auburn, CA	6 GWh	Nov 1986	Dec 2025	Water
Kerckhoff 2	Pacific Gas & Electric Co.	Auberry, CA	450 GWh	Apr 1983	Jul 2026	Water
Toadtown	Pacific Gas & Electric Co.	Magalia, CA	2 GWh	Mar 1986	Oct 2025	Water
Drum 2	Pacific Gas & Electric Co.	Alta, CA	164 GWh	Nov 1965	Dec 2025	Water
Diablo Canyon	Pacific Gas & Electric Co.	Avila Beach, CA	18 TWh	Apr 1985	Jul 2026	Nuclear
Gateway Generating Station	Pacific Gas & Electric Co.	Antioch, CA	2 TWh	Dec 2008	Jul 2026	Natural Gas
Colusa Generating Station	Pacific Gas & Electric Co.	Maxwell, CA	2 TWh	Nov 2010	Jul 2026	Natural Gas
Pit 5	Pacific Gas & Electric Co.	Big Bend, CA	211 GWh	Mar 1944	Jul 2026	Water
Poe	Pacific Gas & Electric Co.	Storrie, CA	197 GWh	Sep 1958	Jul 2026	Water
Guernsey Solar Station	Pacific Gas & Electric Co.	Hanford, CA	22 GWh	Jul 2013	Dec 2025	Solar
Pit 7	Pacific Gas & Electric Co.	Montgomery Creek, CA	366 GWh	Aug 1965	Jul 2026	Water
Balch 1	Pacific Gas & Electric Co.	Balch Camp, CA	71 GWh	Jan 1927	Dec 2025	Water
Alta Powerhouse	Pacific Gas & Electric Co.	Alta, CA	2 GWh	Oct 1902	Dec 2025	Water
Gates Solar Station	Pacific Gas & Electric Co.	Huron, CA	31 GWh	May 2013	Dec 2025	Solar
Volta 2	Pacific Gas & Electric Co.	Manton, CA	4 GWh	Oct 1981	Dec 2025	Water
Pit 6	Pacific Gas & Electric Co.	Montgomery Creek, CA	262 GWh	Jul 1965	Dec 2025	Water
West Gates Solar Station	Pacific Gas & Electric Co.	Huron, CA	14 GWh	Apr 2013	Dec 2025	Solar
Pit 4	Pacific Gas & Electric Co.	Big Bend, CA	342 GWh	Jun 1955	Jul 2026	Water
Huron Solar Station	Pacific Gas & Electric Co.	Huron, CA	28 GWh	May 2012	Dec 2025	Solar
Pit 3	Pacific Gas & Electric Co.	Burney, CA	375 GWh	Jun 1925	Dec 2025	Water
Pit 1	Pacific Gas & Electric Co.	Burney, CA	256 GWh	Aug 1922	Dec 2025	Water
Cantua Solar Station	Pacific Gas & Electric Co.	TBD, CA	23 GWh	May 2012	Dec 2025	Solar
Giffen	Pacific Gas & Electric Co.	TBD, CA	12 GWh	May 2012	Dec 2025	Solar
Phoenix	Pacific Gas & Electric Co.	Sonora, CA	5 GWh	Jan 1940	Dec 2025	Water
Kings River PH	Pacific Gas & Electric Co.	Balch Camp, CA	81 GWh	Feb 1962	Dec 2025	Water
Stroud Solar Station	Pacific Gas & Electric Co.	Helm, CA	15 GWh	Aug 2011	Dec 2025	Solar
Spaulding 3	Pacific Gas & Electric Co.	Emigrant Gap, CA	17 GWh	Jan 1929	Dec 2025	Water
Spaulding 2	Pacific Gas & Electric Co.	Emigrant Gap, CA	21 MWh	Jun 1928	Nov 2025	Water
Vaca Dixon Solar Station	Pacific Gas & Electric Co.	Vacaville, CA	3 GWh	Nov 2009	Dec 2025	Solar
Spaulding 1	Pacific Gas & Electric Co.	Emigrant Gap, CA	17 GWh	Apr 1928	Dec 2025	Water
South	Pacific Gas & Electric Co.	Manton, CA	11 GWh	Nov 1979	Dec 2025	Water
Five Points Solar Station	Pacific Gas & Electric Co.	Five Points, CA	13 GWh	Aug 2011	Dec 2025	Solar
Westside Solar Station	Pacific Gas & Electric Co.	Five Points, CA	12 GWh	Jul 2011	Dec 2025	Solar
Salt Springs	Pacific Gas & Electric Co.	Pioneer, CA	113 GWh	May 1931	Dec 2025	Water
Rock Creek	Pacific Gas & Electric Co.	Storrie, CA	438 GWh	Feb 1950	Jul 2026	Water
Palm Springs DAC PV	Palm Springs USD	Palm Springs, CA	1 GWh	Mar 2021	Dec 2025	Solar
Municipal Cogen Plant	Palm Springs, City of - (CA)	Palm Springs, CA	8 GWh	Apr 1985	Jul 2026	Natural Gas
Dissigno Healdsburg FPV, LLC	Palmetto Power Management LLC	Healdsburg, CA	6 GWh	Nov 2020	Dec 2025	Solar
Panoche Energy Center	Panoche Energy Center, LLC	Firebaugh, CA	731 GWh	May 2009	Jul 2026	Natural Gas
One Market Plaza	Paramount Group Inc	San Francisco, CA	1 GWh	Nov 2003	Dec 2025	Natural Gas
Pastoria Solar	Pastoria Solar Energy Company, LLC	Lebec, CA	32 GWh	-	Jul 2026	Solar
SunZia Wind South	Pattern Operators LP	Corona, NM	2 TWh	-	Jul 2026	Wind
SunZia Wind North	Pattern Operators LP	Clines Corner, NM	462 GWh	-	Jul 2026	Wind
Ocotillo Express LLC	Pattern Operators LP	Ocotillo, CA	411 GWh	Nov 2012	Jul 2026	Wind
Hatchet Ridge Wind Project	Pattern Operators LP	Burney, CA	271 GWh	Nov 2010	Dec 2025	Wind
Sheep Creek Community Solar Farm	Phelan Solar LLC	El Mirage, CA	6 GWh	Jul 2023	Dec 2025	Solar
Pinyon Pine I	Pinyon Pines Wind I, LLC	Mojave, CA	283 GWh	Oct 2012	Dec 2025	Wind
Pinyon Pine II	Pinyon Pines Wind II, LLC	Mojave, CA	204 GWh	Oct 2012	Dec 2025	Wind
Pio Pico Energy Center	Pio Pico Energy Center LLC	San Diego, CA	47 GWh	Oct 2016	Dec 2025	Natural Gas
Pivot Energy PPA 22	Pivot Energy	Visalia, CA	2 GWh	Sep 2024	Dec 2025	Solar
French Meadows	Placer County Water Agency - (CA)	Foresthill, CA	43 GWh	Sep 1966	Dec 2025	Water
Middle Fork	Placer County Water Agency - (CA)	Foresthill, CA	459 GWh	Sep 1966	Jul 2026	Water
Oxbow (CA)	Placer County Water Agency - (CA)	Foresthill, CA	23 GWh	Sep 1966	Dec 2025	Water
Ralston	Placer County Water Agency - (CA)	Foresthill, CA	303 GWh	Sep 1966	Dec 2025	Water
High Sierra Cogeneration Plant	Plumas Sierra Rural Electric Coop	Susanville, CA	33 GWh	Jan 2010	Dec 2025	Natural Gas
PSREC/SIAD Solar	Plumas Sierra Rural Electric Coop	Herlong, CA	6 GWh	Aug 2018	Dec 2025	Solar
Portal Ridge Solar C, LLC	Portal Ridge Solar, LLC	Lancaster, CA	29 GWh	Jan 2017	Dec 2025	Solar
Portal Ridge Solar B, LLC	Portal Ridge Solar, LLC	Lancaster, CA	53 GWh	Jan 2017	Dec 2025	Solar
Potrero Hills Energy Producers	Potrero Hills Energy Producers, LLC	Suisun City, CA	56 GWh	Mar 2016	Dec 2025	Landfill Gas

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