ONeill — Plant Summary
- EIA Plant ID
- 446
- Capacity
- 25.2 MW
- Primary Fuel
- Hydro
- Technology
- Hydroelectric Pumped Storage
- Status
- Operating
- Location
- Merced, CA
- Operating Since
- 1967
- Generators
- 6
- Operator
- U S Bureau of Reclamation
- Parent Company
- —
- Annual Generation
- -65,854 MWh
- Capacity Factor
- -30.0%
- Balancing Authority
- California Independent System Operator
- ISO/RTO
- CAISO
- NERC Region
- WECC
ONeill
OperatingHydro
Ranked #87 of 247 Hydro plants in CA#439 of 1454 nationally
25.2 MW Hydro operating in Merced, CA — California Independent System Operator
EIAWD
25.2 MW
Nameplate Capacity
6
Generators
units
Hydroelectric Pumped Storage
Technology
1967
Operating Since
Location
Coordinates
37.0987, -121.0477
County
Merced, CA
Nearby Plants
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- W R GianelliHydro424 MW · 4.2 km
- Gonzaga Ridge Wind FarmWind132.8 MW · 8.1 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | U S Bureau of Reclamation | — | — |
| Owner(s) | U S Bureau of Reclamation | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
The O'Neill power plant, located in Merced County, California, has a total capacity of 25.2 MW. The plant began operating in 1967 and utilizes hydroelectric pumped storage technology. It is owned and operated by the U.S. Bureau of Reclamation. The primary fuel source for the plant is water (WAT). The facility consists of 6 generators.
The O'Neill plant operates within the California Independent System Operator (CAISO) balancing authority and the Western Electricity Coordinating Council (WECC) NERC region. It is ranked as the 87th largest power plant in California out of 247, and nationally it is ranked 444 out of 1464.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
WECC
Balancing Authority
California Independent System Operator
Grid Voltage
72.5 kV
Regulatory Status
RE
Entity Type
Federal
Sector
Electric Utility
Generation
−6.5K MWh
Net Charging
-65.9K MWh
Annual Net Energy
-30.0%
Capacity Factor
Jan 2023 – Dec 2025
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.
Financial Data
No financial data available for this plant.
Pricing & Market Data
HIGH confidenceMarket Position
ISO/RTO Market
CAISO
LMP Node
ONEILPMP_7_N002
Pricing Hub
TH_NP15_GEN-APND
Secondary Zone
TH_ZP26_GEN-APND
Location Type
Pricing Node
Node Source
Curated node match
News & Articles (10)Beta
Regulatory·federal policy
Trump launches bid to tame electricity prices in the Northeast
The White House joins governors in a move to boost electricity generation in one of the country's most expensive markets.
Trump (executive)The White House (regulator)
Politico·2 months ago
General
Stay-at-home sons are here — and they’re not going anywhere
Brendan Liaw was kind of joking when he agreed he was a professional stay-at-home son during his appearance on “Jeopardy!” in May.
The Washington Post·2 months ago
General
O’NEILL: No longer Soviets, they’re still Russians
Let's face it: President Donald Trump's pending peace initiative between Russia and Ukraine has no chance to be accepted by Vladamir Putin...
Southgate News Herald·2 months ago
General
Kevin O'Neill Obituary (1941 - 2025) - Los Angeles, CA - Los Angeles Times
Kevin David O'Neill, 84, of Los Angeles, California, passed away peacefully on December 14, 2025, surrounded by his loving family,...
Legacy | Obituary·2 months ago
Last updated 2026-03-14
View all 10 articles