ONeill
Merced County, California · EIA plant ID 446 · Operator: U S Bureau of Reclamation
Nameplate25MWSummer 14 MW
Generators6in service
Net generation-61GWh12 mo to Aug 2026
Capacity factor—not meaningful for storage
Heat rate—thermal plants only
First online1967
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), primary-fuel units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
No capacity factor available.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 6 | — | — |
| 2002 | 6.7 | — | — |
| 2003 | 2.8 | — | — |
| 2004 | 6 | — | — |
| 2005 | -32 | — | — |
| 2006 | 0.1 | — | — |
| 2007 | 5.4 | — | — |
| 2008 | -1.5 | — | — |
| 2009 | 5.9 | — | — |
| 2010 | 1.6 | — | — |
| 2011 | -8.7 | — | — |
| 2012 | 3.8 | — | — |
| 2013 | -29.4 | — | — |
| 2014 | -5.7 | — | — |
| 2015 | -12.2 | — | — |
| 2016 | -50.9 | — | — |
| 2017 | -105.8 | — | — |
| 2018 | -61.5 | — | — |
| 2019 | -62.5 | — | — |
| 2020 | -45.7 | — | — |
| 2021 | -17.8 | — | — |
| 2022 | -33 | — | — |
| 2023 | -86.9 | — | — |
| 2024 | -66.9 | — | — |
| 2025 | -65.9 | — | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | PS | 4.2 | 2.4 | Jan 1968 | Operating | — | coming soon |
| 2 | Hydroelectric Pumped Storage | PS | 4.2 | 2.4 | Feb 1968 | Operating | — | coming soon |
| 3 | Hydroelectric Pumped Storage | PS | 4.2 | 2.4 | Nov 1967 | Operating | — | coming soon |
| 4 | Hydroelectric Pumped Storage | PS | 4.2 | 2.4 | Nov 1967 | Operating | — | coming soon |
| 5 | Hydroelectric Pumped Storage | PS | 4.2 | 2.4 | Feb 1968 | Operating | — | coming soon |
| 6 | Hydroelectric Pumped Storage | PS | 4.2 | 2.4 | Dec 1967 | Operating | — | coming soon |
Owner / operator
Operator: U S Bureau of Reclamation. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| U S Bureau of Reclamation | 100.0% | 25 MW |
Nearby plants
Within 80 km.
| Quinto Solar PV Project | 108 MW | 3.5 km |
| W R Gianelli | 424 MW | 4.2 km |
| Gonzaga Ridge Wind Farm | 133 MW | 8.1 km |
| Dinosaur Point | 17 MW | 12.3 km |
| Stellar Wright BESS | — | 12.5 km |
| Wright Solar Park | 200 MW | 12.8 km |