Collierville Powerhouse
Calaveras County, California · EIA plant ID 54555 · Operator: Northern California Power Agny
Nameplate253MWSummer 253 MW
Generators2in service
Net generation418GWh12 mo to Aug 2026
Capacity factor19%hydro units, summer MW
Heat rate—thermal plants only
First online1989
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), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
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 | 273.9 | 12.4% | — |
| 2002 | 377.1 | 17.0% | — |
| 2003 | 511.9 | 89.8% | — |
| 2004 | 173.7 | 7.8% | — |
| 2005 | 848.3 | 38.6% | — |
| 2006 | 845.2 | 38.6% | — |
| 2007 | 268.5 | 12.1% | — |
| 2008 | 277.4 | 12.5% | — |
| 2009 | 414.6 | 18.7% | — |
| 2010 | 594.3 | 26.8% | — |
| 2011 | 873.2 | 39.4% | — |
| 2012 | 305 | 13.7% | — |
| 2013 | 210.5 | 9.5% | — |
| 2014 | 177.7 | 8.0% | — |
| 2015 | 143.4 | 6.5% | — |
| 2016 | 460.8 | 20.7% | — |
| 2017 | 1,032.4 | 46.6% | — |
| 2018 | 365.6 | 16.5% | — |
| 2019 | 907.7 | 40.9% | — |
| 2020 | 305.3 | 13.7% | — |
| 2021 | 186.6 | 8.4% | — |
| 2022 | 264.2 | 11.9% | — |
| 2023 | 978.2 | 44.1% | — |
| 2024 | 528.7 | 23.8% | — |
| 2025 | 341.7 | 15.4% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | HY | 126.5 | 126.5 | Nov 1989 | Operating | — | coming soon |
| GEN2 | Conventional Hydroelectric | HY | 126.5 | 126.5 | Nov 1989 | Operating | — | coming soon |
Owner / operator
Operator: Northern California Power Agny. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Calaveras County Water Dist | 100.0% | 253 MW |
Nearby plants
Within 80 km.
| Stanislaus | 82 MW | 1.1 km |
| Murphys | 4 MW | 5.8 km |
| Phoenix | 2 MW | 13.4 km |
| Angels | 1 MW | 16.1 km |
| Sierra Pacific Sonora | 8 MW | 20.6 km |
| Sand Bar Power Plant | 16 MW | 20.7 km |