Moccasin
Tuolumne County, California · EIA plant ID 381 · Operator: City & County of San Francisco
Nameplate104MWSummer 104 MW
Generators2in service
Net generation300GWh12 mo to Aug 2026
Capacity factor33%hydro units, summer MW
Heat rate—thermal plants only
First online1969
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 | 408 | 45.1% | — |
| 2002 | 401 | 45.8% | — |
| 2003 | 351.8 | 40.2% | — |
| 2004 | 391.3 | 44.5% | — |
| 2005 | 424.2 | 48.4% | — |
| 2006 | 408.7 | 46.7% | — |
| 2007 | 343.3 | 39.2% | — |
| 2008 | 368.6 | 42.0% | — |
| 2009 | 348.1 | 39.7% | — |
| 2010 | 376 | 42.9% | — |
| 2011 | 384.7 | 43.9% | — |
| 2012 | 314.5 | 35.8% | — |
| 2013 | 346 | 39.5% | — |
| 2014 | 287.9 | 32.9% | — |
| 2015 | 252 | 28.8% | — |
| 2016 | 359.5 | 40.9% | — |
| 2017 | 324.8 | 37.1% | — |
| 2018 | 330.3 | 37.7% | — |
| 2019 | 328 | 37.4% | — |
| 2020 | 304.1 | 34.6% | — |
| 2021 | 298.6 | 34.1% | — |
| 2022 | 298.6 | 34.1% | — |
| 2023 | 304.7 | 34.8% | — |
| 2024 | 274.7 | 28.1% | — |
| 2025 | 276.6 | 30.5% | — |
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 | 51.8 | 51.8 | Aug 1969 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 51.8 | 51.8 | Sep 1969 | Operating | — | coming soon |
Owner / operator
Operator: City & County of San Francisco. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| City & County of San Francisco | 100.0% | 104 MW |
Nearby plants
Within 80 km.
| Moccasin Low Head Hydro Project | 3 MW | 1.4 km |
| Sierra Pacific Chinese Camp | 4 MW | 15.9 km |
| Don Pedro | 171 MW | 16.5 km |
| Pacific-Ultrapower Chinese Station | 25 MW | 17.2 km |
| Sierra Energy Storage, LLC | 10 MW | 17.2 km |
| Sierra Pacific Sonora | 8 MW | 17.5 km |