Dion R Holm
Tuolumne County, California · EIA plant ID 380 · Operator: City & County of San Francisco
Nameplate180MWSummer 180 MW
Generators2in service
Net generation557GWh12 mo to Aug 2026
Capacity factor35%hydro units, summer MW
Heat rate—thermal plants only
First online1960
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 | 388.9 | 28.3% | — |
| 2002 | 750 | 51.9% | — |
| 2003 | 689.4 | 47.7% | — |
| 2004 | 634.4 | 43.8% | — |
| 2005 | 803.9 | 55.6% | — |
| 2006 | 802.7 | 55.5% | — |
| 2007 | 682.3 | 47.2% | — |
| 2008 | 439.7 | 30.3% | — |
| 2009 | 656 | 45.4% | — |
| 2010 | 788.9 | 57.4% | — |
| 2011 | 833.8 | 60.7% | — |
| 2012 | 410.4 | 29.8% | — |
| 2013 | 502.6 | 36.6% | — |
| 2014 | 428.8 | 31.2% | — |
| 2015 | 602.2 | 43.8% | — |
| 2016 | 648.3 | 47.1% | — |
| 2017 | 924 | 67.3% | — |
| 2018 | 248.1 | 18.1% | — |
| 2019 | 608.3 | 44.3% | — |
| 2020 | 479.9 | 34.8% | — |
| 2021 | 346.4 | 25.2% | — |
| 2022 | 494.7 | 36.0% | — |
| 2023 | 586.8 | 42.7% | — |
| 2024 | 485 | 29.5% | — |
| 2025 | 578.4 | 36.6% | — |
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 | 90.1 | 90.1 | Aug 1960 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 90.1 | 90.1 | Aug 1960 | 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% | 180 MW |
Nearby plants
Within 80 km.
| R C Kirkwood | 133 MW | 2.5 km |
| Moccasin | 104 MW | 30.7 km |
| Moccasin Low Head Hydro Project | 3 MW | 31.5 km |
| Sierra Pacific Sonora | 8 MW | 31.7 km |
| Spring Gap | 6 MW | 34.6 km |
| Phoenix | 2 MW | 34.9 km |