Largest hydroelectric power plants in CAISO

Conventional and pumped-storage hydroelectric plants ranked by EIA-reported nameplate capacity. Rankings use EIA-anchored plant records in CAISO.

Plants
171
Ranked operating records
EIA nameplate capacity
8.5 GW
Sum across this peer set
Largest
1,053 MW
Helms Pumped Storage

Capacity ranking

171 plants
RankPlantCapacity
1Helms Pumped StoragePacific Gas & Electric Co.1,053 MW
2Edward C HyattCalifornia Dept. of Water Resources644.1 MW
3W R GianelliCalifornia Dept. of Water Resources424 MW
4ColgateYuba County Water Agency315 MW
5Devil CanyonCalifornia Dept. of Water Resources276.2 MW
6Collierville PowerhouseNorthern California Power Agny253 MW
7J S EastwoodSouthern California Edison Co199.8 MW
8Mammoth PoolSouthern California Edison Co190 MW
9Dion R HolmCity & County of San Francisco180.2 MW
10Big Creek 3Southern California Edison Co174.5 MW
11James B BlackPacific Gas & Electric Co.168.6 MW
12Pine FlatKings River Conservation Dist165 MW
13PoePacific Gas & Electric Co.142.8 MW
14Pit 5Pacific Gas & Electric Co.141.6 MW
15Kerckhoff 2Pacific Gas & Electric Co.139.5 MW
16HaasPacific Gas & Electric Co.135 MW
17R C KirkwoodCity & County of San Francisco132.8 MW
18Rock CreekPacific Gas & Electric Co.126 MW
19Middle ForkPlacer County Water Agency122.4 MW
20BeldenPacific Gas & Electric Co.117.9 MW
21Caribou 2Pacific Gas & Electric Co.117.9 MW
22ThermalitoCalifornia Dept. of Water Resources115.1 MW
23Pit 7Pacific Gas & Electric Co.109.8 MW
24MoccasinCity & County of San Francisco103.6 MW
25Pit 4Pacific Gas & Electric Co.103.4 MW
26ElectraPacific Gas & Electric Co.102.5 MW
27Big Creek 4Southern California Edison Co100 MW
28Balch 2Pacific Gas & Electric Co.97.2 MW
29ExchequerMerced Irrigation District94.5 MW
30Big Creek 1Southern California Edison Co88.4 MW
31StanislausPacific Gas & Electric Co.81.9 MW
32Pit 3Pacific Gas & Electric Co.80.1 MW
33Pit 6Pacific Gas & Electric Co.79.2 MW
34RalstonPlacer County Water Agency79.2 MW
35W E WarneCalifornia Dept. of Water Resources74.2 MW
36Caribou 1Pacific Gas & Electric Co.73.8 MW
37DonnellsOakdale&South San Joaquin Irrigation D.72 MW
38Pit 1Pacific Gas & Electric Co.69.2 MW
39WoodleafSouth Feather Water and Power Agency67.2 MW
40Big Creek 2Southern California Edison Co66.6 MW
41Big Creek 2ASouthern California Edison Co55 MW
42Drum 2Pacific Gas & Electric Co.53.1 MW
43Tiger CreekPacific Gas & Electric Co.52.2 MW
44Drum 1Pacific Gas & Electric Co.49.2 MW
45Kings River PHPacific Gas & Electric Co.48.6 MW
46Narrows 2Yuba County Water Agency46.7 MW
47Chicago ParkNevada Irrigation District44 MW
48Salt SpringsPacific Gas & Electric Co.42 MW
49ForbestownSouth Feather Water and Power Agency41.9 MW
50Kern River 3Southern California Edison Co40.3 MW

Capacity is EIA-reported nameplate capacity, not seasonal capability or available operating capacity. A plant can include multiple generators and technologies; hybrid plants may appear in multiple peer groups.