Alta Powerhouse
Placer County, California · EIA plant ID 214 · Operator: Pacific Gas & Electric Co
Nameplate1MWSummer 1 MW
Generators1in service
Net generation2GWh12 mo to Dec 2025
Capacity factor25%hydro units, summer MW
Heat rate—thermal plants only
First online1902
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 | 3.7 | 21.3% | — |
| 2002 | 4.4 | 25.1% | — |
| 2003 | 3.9 | 22.1% | — |
| 2004 | 4.3 | 24.7% | — |
| 2005 | 3.8 | 21.7% | — |
| 2006 | 4.6 | 26.2% | — |
| 2007 | 2.7 | 15.5% | — |
| 2008 | 3.6 | 20.3% | — |
| 2009 | 4.1 | 23.6% | — |
| 2010 | 3.6 | 20.5% | — |
| 2011 | 3.6 | 20.3% | — |
| 2012 | 3.8 | 21.6% | — |
| 2013 | 3.4 | 25.9% | — |
| 2014 | 3.5 | 40.5% | — |
| 2015 | 2.9 | 33.4% | — |
| 2016 | 3.1 | 35.5% | — |
| 2017 | 3.5 | 39.8% | — |
| 2018 | 3.4 | 39.3% | — |
| 2019 | 3.4 | 38.8% | — |
| 2020 | 2.4 | 27.7% | — |
| 2021 | 3.8 | 43.5% | — |
| 2022 | 3.9 | 44.2% | — |
| 2023 | 2.5 | 28.8% | — |
| 2024 | 1.4 | 16.5% | — |
| 2025 | 2.2 | 25.3% | — |
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 | Conventional Hydroelectric | HY | 1 | 1 | Nov 1902 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 1 | 1 | Nov 1902 | Retired Jul 2013 | — | coming soon |
Owner / operator
Operator: Pacific Gas & Electric Co. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Pacific Gas & Electric Co | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Dutch Flat 2 | 27 MW | 2.7 km |
| Dutch Flat | 22 MW | 2.8 km |
| Drum 1 | 49 MW | 5.5 km |
| Drum 2 | 53 MW | 5.6 km |
| Chicago Park | 44 MW | 8.6 km |
| Deer Creek PH | 6 MW | 9.8 km |