Donnells
Hydro power plant in Tuolumne County, California. 72 MW of nameplate capacity across 1 generator, operated by Oakdale&South San Joaquin Irrigation D..
Also known as Donnells Power Station · EIA plant 415
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 72 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- June 1957First generator online
- Operator
- Oakdale&South San Joaquin Irrigation D.EIA operator ID 13935
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 1 CAISO nodeResource nodes with prices
- Location
- Tuolumne County, CA38.2467, −120.0341
- EIA plant ID
- 415EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Donnells produces
Free · EIA-923Net generation, 2025
233 GWh
233,415 MWh, final
Capacity factor, 2025
37.0%
2024: 34.7%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
129.2–434.4
GWh a year. Low 2018, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 318,035 | Not reported | 12 of 12 |
| 2001 | 215,683 | Not reported | 12 of 12 |
| 2002 | 311,247 | Not reported | 12 of 12 |
| 2003 | 272,854 | Not reported | 12 of 12 |
| 2004 | 287,958 | Not reported | 12 of 12 |
| 2005 | 343,542 | Not reported | 12 of 12 |
| 2006 | 417,091 | Not reported | 12 of 12 |
| 2007 | 175,254 | Not reported | 12 of 12 |
| 2008 | 220,219 | Not reported | 12 of 12 |
| 2009 | 229,356 | Not reported | 12 of 12 |
| 2010 | 209,039 | 33.1% | 12 of 12 |
| 2011 | 345,865 | 54.8% | 12 of 12 |
| 2012 | 205,020 | 32.4% | 12 of 12 |
| 2013 | 207,972 | 33.0% | 12 of 12 |
| 2014 | 134,635 | 21.3% | 12 of 12 |
| 2015 | 143,134 | 22.7% | 12 of 12 |
| 2016 | 347,220 | 54.9% | 12 of 12 |
| 2017 | 434,431 | 68.9% | 12 of 12 |
| 2018 | 129,198 | 20.5% | 12 of 12 |
| 2019 | 302,325 | 47.9% | 12 of 12 |
| 2020 | 196,927 | 31.1% | 12 of 12 |
| 2021 | 158,087 | 25.1% | 12 of 12 |
| 2022 | 203,567 | 32.3% | 12 of 12 |
| 2023 | 347,749 | 55.1% | 12 of 12 |
| 2024 | 219,157 | 34.7% | 12 of 12 |
| 2025 | 233,415 | 37.0% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 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 |
|---|---|---|---|
| H1 | Conventional Hydroelectric | 72.0 | June 1957 |
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 Oakdale&South San Joaquin Irrigation D. 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 Donnells
More plants operated by Oakdale&South San Joaquin Irrigation D.
Questions about Donnells
How much power does Donnells produce?
Donnells reported 233,415 MWh (233 GWh) of net generation in 2025, a 37.0% capacity factor on 72 MW of nameplate capacity.
Where is Donnells?
Donnells is in Tuolumne County, California, at 38.2467, −120.0341. It is in the California Independent System Operator balancing area (CISO).
Who operates Donnells?
EIA-860M for August 2026 lists Oakdale&South San Joaquin Irrigation D. as the operator (EIA operator ID 13935). The operator is not always the owner.
When did Donnells start operating?
Its first generator began operating in June 1957, according to EIA-860M.
Does InfraMap have power prices for Donnells?
Yes. InfraMap has CAISO day-ahead and real-time prices at 1 price node linked to Donnells, 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