Grid Storage

Castaic hydroelectric plant

United States

10th-largest grid storage in United States of 101 · top 12% worldwide (#109 of 965)

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Operator: Los Angeles Department of Water & Power (LADWP)
Owner: California Department of Water Resources, Los Angeles Department of Water & Power (LADWP)
Status: operating
Capacity: 1,682 MW
Technology: pumped storage (site also has conventional hydro)
Commissioned: 1972
Also listed as: A power plant — this site generates as well as stores

Comparable grid storages · United States · 101 ranked

#1Red Lake Pumped hydroelectric plant3.0 GW
#8Dry Canyon Pumped Storage hydroelectric plant1.8 GW
#9Raccoon Mountain hydroelectric plant1.7 GW
#10Castaic hydroelectric plant1.7 GW
#11Carrizo Four Corners Pumped Storage hydroelectric plant1.5 GW
#12Norton Pumped Storage hydroelectric plant1.5 GW

All grid storages in United States →

Grid connection · within 50 km

Nearest substation: Sylmar Converter Station
Its voltage: 500 kV
Distance: 34 km
Strongest line nearby: 500 kV
Line operator: Southern California Edison
Substations in range: 5

Mapped grid infrastructure from OpenStreetMap, whose coverage is excellent in some regions and sparse in others. Nothing shown here means nothing is mappednearby — not that the site is unconnected. Lines are matched on a segment’s midpoint, so a corridor passing directly overhead can be missed; this under-reports rather than invents.

Co-located infrastructure · within 25 km

Castaic hydroelectric plant0 m · Power Plant · 1.7 GW · hydro

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Portfolio

All assets by Los Angeles Department of Water & Power (LADWP) →All assets by California Department of Water Resources →

Watercourse: Pyramid Lake California State Aqueduct

SOURCE: Global Energy Monitor · Global Integrated Power, March 2026 (CC BY 4.0)