Dion R Holm
Hydro power plant in Tuolumne County, California. 180.2 MW of nameplate capacity across 2 generators, operated by City & County of San Francisco - (CA).
Also known as Holm Powerhouse · Cherry Powerhouse · EIA plant 380
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 180.2 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- August 1960First generator online
- Operator
- City & County of San Francisco - (CA)EIA operator ID 16612
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 1 CAISO nodeResource nodes with prices
- Location
- Tuolumne County, CA37.8966, −119.9675
- EIA plant ID
- 380EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Dion R Holm produces
Free · EIA-923Net generation, 2025
578 GWh
578,435 MWh, final
Capacity factor, 2025
36.6%
2024: Not reported
January to July 2026
420 GWh
Provisional
Range, 2015 to 2025
248.1–924.0
GWh a year. Low 2018, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 950,250 | Not reported | 12 of 12 |
| 2001 | 388,868 | Not reported | 12 of 12 |
| 2002 | 749,995 | Not reported | 12 of 12 |
| 2003 | 689,382 | Not reported | 12 of 12 |
| 2004 | 634,440 | Not reported | 12 of 12 |
| 2005 | 803,861 | Not reported | 12 of 12 |
| 2006 | 802,660 | Not reported | 12 of 12 |
| 2007 | 682,334 | Not reported | 12 of 12 |
| 2008 | 439,711 | Not reported | 12 of 12 |
| 2009 | 656,025 | Not reported | 12 of 12 |
| 2010 | 788,899 | Not reported | 12 of 12 |
| 2011 | 833,802 | 60.7% | 12 of 12 |
| 2012 | 410,424 | 29.8% | 12 of 12 |
| 2013 | 502,622 | 36.6% | 12 of 12 |
| 2014 | 428,782 | 31.2% | 12 of 12 |
| 2015 | 602,167 | 43.8% | 12 of 12 |
| 2016 | 648,323 | 47.1% | 12 of 12 |
| 2017 | 924,032 | 67.3% | 12 of 12 |
| 2018 | 248,059 | 18.1% | 12 of 12 |
| 2019 | 608,291 | 44.3% | 12 of 12 |
| 2020 | 479,883 | 34.8% | 12 of 12 |
| 2021 | 346,441 | 25.2% | 12 of 12 |
| 2022 | 494,658 | 36.0% | 12 of 12 |
| 2023 | 586,820 | 42.7% | 12 of 12 |
| 2024 | 485,010 | Not reported | 12 of 12 |
| 2025 | 578,435 | 36.6% | 12 of 12 |
| 2026 (provisional, partial year) | 419,771 | 45.8% | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · CAISOEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 90.1 | August 1960 |
| 2 | Conventional Hydroelectric | 90.1 | August 1960 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists City & County of San Francisco - (CA) as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Dion R Holm
More plants operated by City & County of San Francisco - (CA)
Questions about Dion R Holm
How much power does Dion R Holm produce?
Dion R Holm reported 578,435 MWh (578 GWh) of net generation in 2025, a 36.6% capacity factor on 180.2 MW of nameplate capacity. From January to July 2026 it reported 420 GWh, which is provisional.
Where is Dion R Holm?
Dion R Holm is in Tuolumne County, California, at 37.8966, −119.9675. It is in the California Independent System Operator balancing area (CISO).
Who operates Dion R Holm?
EIA-860M for August 2026 lists City & County of San Francisco - (CA) as the operator (EIA operator ID 16612). The operator is not always the owner.
When did Dion R Holm start operating?
Its first generator began operating in August 1960, according to EIA-860M.
Does InfraMap have power prices for Dion R Holm?
Yes. InfraMap has CAISO day-ahead and real-time prices at 1 price node linked to Dion R Holm, with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- CAISO day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page