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	Jul 2026
Annual Generation	169.4 TWh
Power Plants	2,135
Utilities	988
Ranked #7 out of 64 in terms of net annual generation
Ranked #12 out of 53 in terms of annual generation from natural gas
Power Plant Types	Natural Gas \| 34% Solar \| 30% Water \| 12.4% Wind \| 11.3% Nuclear \| 11%

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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
Desert Breeze Solar, LLC	Terra-Gen Operating Co-Solar	Hinkley, CA	34 GWh	-	May 2026	Solar
SunZia Wind North	Pattern Operators LP	Clines Corner, NM	313 GWh	-	May 2026	Wind
OES Biogas Power	Organic Energy Solutions, Inc.	San Bernardino, CA	5 GWh	-	Dec 2024	Other Biomass Gas
SunZia Wind South	Pattern Operators LP	Corona, NM	1 TWh	-	May 2026	Wind
Angela Solar Project	Angiola East LLC	Alpaugh, CA	11 GWh	-	May 2026	Solar
Conflitti Solar	CES Electron Farm One, LLC	Firebaugh, CA	100 MWh	-	Dec 2025	Solar
Alta Powerhouse	Pacific Gas & Electric Co.	Alta, CA	2 GWh	Oct 1902	Dec 2025	Water
Mill Creek 3	Southern California Edison Co	Mill Creek, CA	771 MWh	Feb 1903	Dec 2025	Water
Bishop Creek 4	Southern California Edison Co	Bishop, CA	36 GWh	Aug 1905	Dec 2025	Water
Kern River 1	Southern California Edison Co	Bakersfield, CA	176 GWh	Apr 1907	Dec 2025	Water
Deer Creek PH	Nevada Irrigation District	Nevada City, CA	15 GWh	Apr 1908	Dec 2025	Water
Bishop Creek 2	Southern California Edison Co	Bishop, CA	13 GWh	Oct 1908	Dec 2025	Water
A G Wishon	Pacific Gas & Electric Co.	North Fork, CA	24 GWh	Aug 1910	Oct 2025	Water
Lundy	Southern California Edison Co	Lee Vining, CA	7 GWh	Nov 1911	Dec 2025	Water
Bishop Creek 6	Southern California Edison Co	Bishop, CA	9 GWh	Feb 1913	Dec 2025	Water
Bishop Creek 3	Southern California Edison Co	Bishop, CA	24 GWh	May 1913	Dec 2025	Water
Drum 1	Pacific Gas & Electric Co.	Alta, CA	15 GWh	Oct 1913	Dec 2025	Water
Big Creek 1	Southern California Edison Co	Big Creek, CA	409 GWh	Oct 1913	Dec 2025	Water
Big Creek 2	Southern California Edison Co	Auberry, CA	377 GWh	Nov 1913	Dec 2025	Water
Rush Creek	Southern California Edison Co	June lake, CA	30 GWh	Sep 1916	Dec 2025	Water
Halsey	Pacific Gas & Electric Co.	Auburn, CA	22 GWh	Nov 1916	Dec 2025	Water
Wise	Pacific Gas & Electric Co.	Auburn, CA	30 GWh	Feb 1917	Dec 2025	Water
Fontana	Southern California Edison Co	Rialto, CA	2 GWh	Nov 1917	Nov 2025	Water
Bishop Creek 5	Southern California Edison Co	Bishop, CA	11 GWh	May 1919	Dec 2025	Water
Kern River 3	Southern California Edison Co	Kernville, CA	143 GWh	Feb 1921	Dec 2025	Water
Caribou 1	Pacific Gas & Electric Co.	Belden, CA	276 GWh	May 1921	Dec 2025	Water
Hat Creek 1	Pacific Gas & Electric Co.	Burney, CA	32 GWh	Jul 1921	Dec 2025	Water
Big Creek 8	Southern California Edison Co	Auberry, CA	152 GWh	Jul 1921	Dec 2025	Water
Hat Creek 2	Pacific Gas & Electric Co.	Burney, CA	46 GWh	Aug 1921	Dec 2025	Water
Spring Gap	Pacific Gas & Electric Co.	Long Barn, CA	12 GWh	Aug 1921	Dec 2025	Water
Pit 1	Pacific Gas & Electric Co.	Burney, CA	256 GWh	Aug 1922	Dec 2025	Water
Big Creek 3	Southern California Edison Co	Auberry, CA	747 GWh	Aug 1923	May 2026	Water
El Dorado	El Dorado Irrigation District	Pollock Pines, CA	81 GWh	Dec 1923	Dec 2025	Water
Poole	Southern California Edison Co	Lee Vining, CA	22 GWh	Apr 1924	Dec 2025	Water
Pit 3	Pacific Gas & Electric Co.	Burney, CA	375 GWh	Jun 1925	Dec 2025	Water
Balch 1	Pacific Gas & Electric Co.	Balch Camp, CA	71 GWh	Jan 1927	Dec 2025	Water
Bucks Creek	Pacific Gas & Electric Co.	Storrie, CA	192 GWh	Feb 1928	Dec 2025	Water
Spaulding 1	Pacific Gas & Electric Co.	Emigrant Gap, CA	17 GWh	Apr 1928	Dec 2025	Water
Spaulding 2	Pacific Gas & Electric Co.	Emigrant Gap, CA	21 MWh	Jun 1928	Nov 2025	Water
Big Creek 2A	Southern California Edison Co	Auberry, CA	274 GWh	Jul 1928	May 2026	Water
Spaulding 3	Pacific Gas & Electric Co.	Emigrant Gap, CA	17 GWh	Jan 1929	Dec 2025	Water
Merced Falls	Merced Irrigation District	Snelling, CA	9 GWh	Jun 1930	Sep 2025	Water
Pardee	East Bay Municipal Util Dist - (CA)	Valley Springs, CA	80 GWh	Jun 1930	Dec 2025	Water
Salt Springs	Pacific Gas & Electric Co.	Pioneer, CA	113 GWh	May 1931	Dec 2025	Water
Tiger Creek	Pacific Gas & Electric Co.	Pioneer, CA	216 GWh	May 1931	Dec 2025	Water
Humboldt Sawmill Company	Mendocino Forest Products	Scotia, CA	118 GWh	Dec 1937	May 2026	Wood/Wood Waste Solids : 99.9%
Angels	Utica Water & Power Authority	Angels Camp, CA	6 GWh	Dec 1939	Dec 2025	Water
Phoenix	Pacific Gas & Electric Co.	Sonora, CA	5 GWh	Jan 1940	Dec 2025	Water
Narrows PH	Yuba County Water Agency - (CA)	Grass Valley, CA	73 GWh	Nov 1942	Dec 2025	Water
Dutch Flat	Pacific Gas & Electric Co.	Alta, CA	66 GWh	Feb 1943	Dec 2025	Water
Pit 5	Pacific Gas & Electric Co.	Big Bend, CA	456 GWh	Mar 1944	Feb 2026	Water
Argus Cogen Plant	Searles Valley Minerals Operations Inc.	Trona, CA	187 GWh	Nov 1947	May 2026	Bituminous Coal : 82.0% Natural Gas : 18.0%
Electra	Pacific Gas & Electric Co.	Jackson, CA	262 GWh	May 1948	May 2026	Water
West Point PH	Pacific Gas & Electric Co.	Pioneer, CA	18 GWh	Oct 1948	Dec 2025	Water
Cresta	Pacific Gas & Electric Co.	Storrie, CA	342 GWh	Oct 1949	Dec 2025	Water
Rock Creek	Pacific Gas & Electric Co.	Storrie, CA	472 GWh	Feb 1950	May 2026	Water
Big Creek 4	Southern California Edison Co	North Fork, CA	392 GWh	May 1951	May 2026	Water
SJ/SC WPCP	San Jose/Santa Clara Water P C	San Jose, CA	69 GWh	Jan 1953	May 2026	Natural Gas : 54.1% Other Biomass Gas : 45.7%
Murphys	Utica Water & Power Authority	Murphys, CA	15 GWh	Feb 1954	Dec 2025	Water
Pit 4	Pacific Gas & Electric Co.	Big Bend, CA	349 GWh	Jun 1955	May 2026	Water
AES Alamitos LLC	AES Alamitos LLC	Long Beach, CA	28 GWh	Aug 1956	Oct 2025	Natural Gas
Portal	Southern California Edison Co	Lakeshore, CA	26 GWh	Nov 1956	Dec 2025	Water
Beardsley	Oakdale&South San Joaquin Irrigation D.	None, CA	56 GWh	Apr 1957	Dec 2025	Water
Donnells	Oakdale&South San Joaquin Irrigation D.	None, CA	233 GWh	May 1957	Dec 2025	Water
C&H Sugar Plant	C&H Sugar Company Inc	Crockett, CA	41 GWh	Sep 1957	Apr 2026	Purchased Steam
AES Huntington Beach LLC	AES Huntington Beach LLC	Huntington Beach, CA	7 GWh	May 1958	Mar 2026	Natural Gas
Tulloch	Oakdale&South San Joaquin Irrigation D.	Jamestown, CA	103 GWh	May 1958	Dec 2025	Water
Pebbly Beach Generating Station Hybrid	Southern California Edison Co	Avalon, CA	28 GWh	Jun 1958	May 2026	Distillate Fuel Oil : 95.0% Gaseous Propane : 5.0%
Poe	Pacific Gas & Electric Co.	Storrie, CA	363 GWh	Sep 1958	Mar 2026	Water
Balch 2	Pacific Gas & Electric Co.	Balch Camp, CA	342 GWh	Oct 1958	Dec 2025	Water
Caribou 2	Pacific Gas & Electric Co.	Belden, CA	471 GWh	Oct 1958	May 2026	Water
Butt Valley	Pacific Gas & Electric Co.	Belden, CA	145 GWh	Nov 1958	Dec 2025	Water
Haas	Pacific Gas & Electric Co.	Balch Camp, CA	155 GWh	Nov 1958	May 2026	Water
Mammoth Pool	Southern California Edison Co	North Fork, CA	569 GWh	Feb 1960	May 2026	Water
Dion R Holm	City & County of San Francisco - (CA)	Groveland, CA	578 GWh	Jul 1960	May 2026	Water
Kings River PH	Pacific Gas & Electric Co.	Balch Camp, CA	81 GWh	Feb 1962	Dec 2025	Water
De Sabla	Pacific Gas & Electric Co.	Magalia, CA	21 GWh	Jan 1963	Dec 2025	Water
Stanislaus	Pacific Gas & Electric Co.	Vallecito, CA	200 GWh	Feb 1963	Dec 2025	Water
Kelly Ridge	South Feather Water and Power Agency	Oroville, CA	69 GWh	Aug 1963	Dec 2025	Water
Forbestown	South Feather Water and Power Agency	Forbestown, CA	115 GWh	Sep 1963	Dec 2025	Water
Woodleaf	South Feather Water and Power Agency	Forbestown, CA	167 GWh	Oct 1963	Dec 2025	Water
Chili Bar	Sacramento Municipal Util Dist	Placerville, CA	25 GWh	Feb 1965	Dec 2025	Water
Pit 6	Pacific Gas & Electric Co.	Montgomery Creek, CA	262 GWh	Jul 1965	Dec 2025	Water
Pit 7	Pacific Gas & Electric Co.	Montgomery Creek, CA	376 GWh	Aug 1965	May 2026	Water
Chicago Park	Nevada Irrigation District	Colfax, CA	65 GWh	Oct 1965	Dec 2025	Water
Dutch Flat 2	Nevada Irrigation District	Dutch Flat, CA	15 GWh	Oct 1965	Dec 2025	Water
Drum 2	Pacific Gas & Electric Co.	Alta, CA	164 GWh	Nov 1965	Dec 2025	Water
James B Black	Pacific Gas & Electric Co.	Big Bend, CA	531 GWh	Nov 1965	May 2026	Water
French Meadows	Placer County Water Agency - (CA)	Foresthill, CA	51 GWh	Sep 1966	Dec 2024	Water
Middle Fork	Placer County Water Agency - (CA)	Foresthill, CA	444 GWh	Sep 1966	May 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
R C Kirkwood	City & County of San Francisco - (CA)	Groveland, CA	489 GWh	Jan 1967	May 2026	Water
Exchequer	Merced Irrigation District	Snelling, CA	246 GWh	Jun 1967	Dec 2025	Water
McSwain	Merced Irrigation District	Snelling, CA	27 GWh	Jun 1967	Oct 2025	Water
Dynegy Moss Landing Power Plant Hybrid	Dynegy -Moss Landing LLC	Moss Landing, CA	2 TWh	Nov 1967	May 2026	Natural Gas
Thermalito	California Dept. of Water Resources	Oroville, CA	302 GWh	Jan 1968	May 2026	Water
Edward C Hyatt	California Dept. of Water Resources	Oroville, CA	2 TWh	Feb 1968	May 2026	Water
Altamont Gas Recovery	WM Renewable Energy LLC	Livermore, CA	39 GWh	Feb 1969	Dec 2025	Landfill Gas
Moccasin	City & County of San Francisco - (CA)	Moccasin, CA	308 GWh	Jul 1969	May 2026	Water

Surrounding Balancing Authorities

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#25	Arizona Public Service Company	25.2 TWh	100
#54	Arlington Valley, LLC	3.2 TWh	1
#38	Balancing Authority of Northern California	13.7 TWh	90
#49	Imperial Irrigation District	6.2 TWh	66
#29	Los Angeles Department of Water and Power	18.8 TWh	131
#22	Nevada Power Company	36.8 TWh	143
#51	PUD No. 1 of Douglas County	4.4 TWh	4
#19	Salt River Project Agricultural Improvement and Power District	60.3 TWh	49
#57	Turlock Irrigation District	1.9 TWh	11
#40	Western Area Power Administration - Desert Southwest Region	10.4 TWh	34

Balancing Authorities with Similar Net Generation

Rank	Balancing Authority	Annual Net Generation	# Power Plants
#3	Electric Reliability Council of Texas, Inc.	494.1 TWh	1,471
#5	Southwest Power Pool	306.8 TWh	856
#6	Southern Company Services, Inc. - Trans	253.5 TWh	422
#7	California Independent System Operator	169.4 TWh	2,135
#9	Tennessee Valley Authority	163.4 TWh	207
#10	Florida Power & Light Co.	152.2 TWh	187
#12	New York Independent System Operator	134.3 TWh	1,299
#13	Duke Energy Carolinas	112.6 TWh	577
#15	ISO New England	111.1 TWh	1,629
#16	Bonneville Power Administration	91.6 TWh	167