- Clean firm
- Operating
- 10 · 100 · 1,000 MW
Map
- Clean firm
- Operating
Donnells: location. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Donnells
Power plant · Hydro
Key facts
Power plant · Hydroran 37% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1957
- Net generation, 2025
- 233,415 MWh
- Grid
- 115 kV to Pacific Gas & Electric Co (CISO)
- Location
- Tuolumne County, California
- Operated by
- Oakdale&South San Joaquin Irrigation D.SourceEIA-860M Preliminary Monthly Electric Generator Inventory
Operations
- Net generation, 2025
- 233,415
MWh - Fuel burned, 2025
- 796,412
MMBtu - Capacity factor, 2025
- 37.0
% - Heat rate, 2025
- Not stated
| Year | Net generation (MWh) | Fuel burned (MMBtu) | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|---|
| 2025 | 233,415 | 796,412 | 37.0% | — |
| 2024 | 219,157 | 747,764 | 34.6% | — |
| 2023 | 347,749 | 1,186,519 | 55.1% | — |
| 2022 | 203,567 | 694,570 | 32.3% | — |
| 2021 | 158,087 | 1,398,123 | 25.1% | — |
| 2020 | 196,927 | 1,726,458 | 31.1% | — |
| 2019 | 302,325 | 2,692,205 | 47.9% | — |
| 2018 | 129,198 | 1,176,219 | 20.5% | — |
| 2017 | 434,431 | 4,002,413 | 68.9% | — |
| 2016 | 347,220 | 3,205,533 | 54.9% | — |
| 2015 | 143,134 | 1,333,865 | 22.7% | — |
| 2014 | 134,635 | 1,280,378 | 21.3% | — |
| 2013 | 207,972 | 1,984,260 | 33.0% | — |
| 2012 | 205,020 | 1,950,970 | 32.4% | — |
| 2011 | 345,865 | 3,360,424 | 54.8% | — |
| 2010 | 209,039 | 2,039,384 | 33.1% | — |
| 2009 | 229,356 | 2,238,515 | 36.4% | — |
| 2008 | 220,219 | 2,170,038 | 34.8% | — |
| 2007 | 175,254 | 1,732,211 | 27.8% | — |
| 2006 | 417,091 | 4,137,128 | 66.1% | — |
| 2005 | 343,542 | 3,435,076 | 54.5% | — |
| 2004 | 287,958 | 2,885,915 | 45.5% | — |
| 2003 | 272,854 | 2,794,298 | 43.3% | — |
| 2002 | 311,247 | 3,166,316 | 49.4% | — |
| 2001 | 215,683 | 2,228,652 | 34.2% | — |
How these are worked out
Net generation and fuel burned are the monthly figures EIA publishes in its bulk electricity file, from the plant's Form 923 reports; a year is the sum of its months. Capacity factor is a full year's net generation over today's nameplate capacity times the hours in that year (8,784 in a leap year), so a plant uprated or partly retired since reads against its current size; heat rate is fuel burned over net generation, for plants that burn fuel. A year with fewer than twelve months stated has no capacity factor, and a value outside the plausible range is left blank rather than shown. By month, the charts apply the same rules to each month's own hours and fuel.
Sources
3 sourcesSources
- EIA-860M
- GEMGlobal Integrated Power Tracker, Global Energy Monitor, September 2026 release (https://globalenergymonitor.org/projects/global-integrated-power-tracker), CC BY 4.0. Modified by Inframation: TransitionZero-sourced rows removed; statuses and technologies mapped to Inframation's vocabulary; figures aggregated. Copyright © Global Energy Monitor. Global Integrated Power Tracker, September 2026 release. Distributed under a Creative Commons Attribution 4.0 International License.
- EIASource: U.S. Energy Information Administration, Electricity bulk data (Form EIA-923 monthly plant series)