Spring Gap
Tuolumne County, California · EIA plant ID 284 · Operator: Pacific Gas & Electric Co
Nameplate6MWSummer 7 MW
Generators1in service
Net generation12GWh12 mo to Dec 2025
Capacity factor19%hydro units, summer MW
Heat rate—thermal plants only
First online1921
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 | 34 | 55.4% | — |
| 2002 | 36 | 58.7% | — |
| 2003 | 42.6 | 69.5% | — |
| 2004 | 37.5 | 61.0% | — |
| 2005 | 44.2 | 72.0% | — |
| 2006 | 42.9 | 70.0% | — |
| 2007 | 24.1 | 39.3% | — |
| 2008 | 33.7 | 54.9% | — |
| 2009 | 38.6 | 62.9% | — |
| 2010 | 41.7 | 67.9% | — |
| 2011 | 40.7 | 66.4% | — |
| 2012 | 20.6 | 33.5% | — |
| 2013 | 30.6 | 49.9% | — |
| 2014 | 15.3 | 25.0% | — |
| 2015 | 25.1 | 41.0% | — |
| 2016 | 34.8 | 56.6% | — |
| 2017 | 29.7 | 48.4% | — |
| 2018 | 30 | 48.9% | — |
| 2019 | 34.7 | 56.5% | — |
| 2020 | 20.2 | 32.8% | — |
| 2021 | 14.2 | 23.2% | — |
| 2022 | 33.5 | 54.6% | — |
| 2023 | 31.1 | 50.6% | — |
| 2024 | 25.9 | 42.2% | — |
| 2025 | 11.6 | 18.9% | — |
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 | Conventional Hydroelectric | HY | 6 | 7 | Sep 1921 | Operating | — | 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% | 6 MW |
Nearby plants
Within 80 km.
| Sand Bar Power Plant | 16 MW | 3.3 km |
| Beardsley | 10 MW | 3.5 km |
| Donnells | 72 MW | 9.5 km |
| Stanislaus | 82 MW | 23.2 km |
| Collierville Powerhouse | 253 MW | 24 km |
| Spicer Meadow Project | 6 MW | 24.8 km |