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1682 MW Conventional Hydroelectric (56 MW) + Hydroelectric Pumped Storage (1626 MW) operating in Los Angeles, CA
1,682 MW
Nameplate Capacity
7
Generators
units
Hybrid (2)
Technology
Conventional Hydroelectric + Hydroelectric Pumped Storage
1972
Operating Since
Coordinates
34.5872, -118.6566
County
Los Angeles, CA
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Los Angeles Department of Water & Power | Los Angeles Department of Water & Power (LADWP) | Los Angeles Department of Water and Power |
| Owner(s) | Los Angeles Department of Water & Power | Los Angeles Department of Water & Power | — |
| Status | Operating | operating | — |
Castaic Power Plant, also known as the Castaic Pumped-Storage Plant, is a seven-unit pumped-storage hydroelectric plant, operated by the Los Angeles Department of Water and Power, which provides peak load power from the falling water on the West Branch of the California State Aqueduct. It is a cooperative venture between the LADWP and the Department of Water Resources of the State of California. An agreement between the two organizations was signed on September 2, 1966, for construction of the project.
Read more on WikipediaCastaic Power Plant, located in Los Angeles County, California, is a 1682 MW hybrid hydroelectric facility using both conventional and pumped storage technologies. The plant began operating in 1972 and is owned and operated by the Los Angeles Department of Water & Power (LADWP). It utilizes water (WAT) as its primary fuel source and consists of 7 generators. Castaic is ranked as the largest hydroelectric plant in California out of 42 such plants, and ninth-largest nationally among 194 plants.
In the most recent year with available data, Castaic generated 158,926 MWh of electricity, resulting in a capacity factor of 1.1%. The plant operates within the balancing authority of the Los Angeles Department of Water and Power and is situated in the Western Electricity Coordinating Council (WECC) NERC region. News coverage of Castaic has included 10 articles, with the majority focusing on industry-related topics, followed by regulatory, hazard, and grid-related news.
Generated from EIA, GEM, and public data sources
Grid Region
California (non-ISO)
Market
WEIM Participant
NERC Region
WECC — Western Electricity Coordinating Council
Balancing Authority
Los Angeles Department of Water and Power (LDWP)
Grid Voltage
230.0 kV
Regulatory Status
RE — Regulated
Entity Type
Municipal
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
8.2K MWh
Net Discharge
158.9K MWh
Annual Net Energy
1.1%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
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2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $3.9B
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Market Position
LMP Node
none
Pricing Hub
—
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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