- Clean firm
- Operating
- 10 · 100 · 1,000 MW
Map
- Clean firm
- Operating
Mammoth Pool: location. Basemap: Protomaps, © OpenStreetMap contributors, ODbL.
Mammoth Pool
Power plant · Hydro
Key facts
Power plant · Hydroran 28% of 2025 Operating- Capacity
- Capacity: sourceEIA-860M · Open licenseMW
- Commissioned
- 1960
- Net generation, 2025
- 465,889 MWh
- Grid
- 220 kV to Southern California Edison Co (CISO)
- Location
- Madera County, California
- Operated by
- Southern California Edison CoSourceEIA-860M Preliminary Monthly Electric Generator Inventory
Operations
- Net generation, 2025
- 465,889
MWh - Fuel burned, 2025
- 1,589,613
MMBtu - Capacity factor, 2025
- 28.0
% - Heat rate, 2025
- Not stated
| Year | Net generation (MWh) | Fuel burned (MMBtu) | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|---|
| 2026 (8 of 12 months) | 474,575 | 1,619,249 | — | — |
| 2025 | 465,889 | 1,589,613 | 28.0% | — |
| 2024 | 413,586 | 1,411,154 | 24.8% | — |
| 2023 | 449,030 | 1,533,096 | 27.0% | — |
| 2022 | 507,648 | 1,732,529 | 30.5% | — |
| 2021 | 293,325 | 2,594,963 | 17.6% | — |
| 2020 | 320,642 | 2,811,068 | 19.2% | — |
| 2019 | 513,546 | 4,573,261 | 30.9% | — |
| 2018 | 443,429 | 4,036,978 | 26.6% | — |
| 2017 | 970,250 | 8,938,913 | 58.3% | — |
| 2016 | 632,582 | 5,839,997 | 37.9% | — |
| 2015 | 137,647 | 1,283,561 | 8.3% | — |
| 2014 | 217,263 | 2,067,978 | 13.1% | — |
| 2013 | 355,683 | 3,393,601 | 21.4% | — |
| 2012 | 290,953 | 2,776,391 | 17.4% | — |
| 2011 | 753,863 | 7,324,572 | 45.3% | — |
| 2010 | 708,585 | 6,912,955 | 42.6% | — |
| 2009 | 541,866 | 5,288,876 | 32.6% | — |
| 2008 | 296,341 | 2,920,145 | 17.8% | — |
| 2007 | 259,100 | 2,560,945 | 15.6% | — |
| 2006 | 760,487 | 7,543,270 | 45.7% | — |
| 2005 | 675,557 | 6,755,594 | 40.6% | — |
| 2004 | 500,302 | 5,014,027 | 30.0% | — |
| 2003 | 512,986 | 5,253,490 | 30.8% | — |
| 2002 | 487,037 | 4,954,627 | 29.3% | — |
| 2001 | 428,952 | 4,432,361 | 25.8% | — |
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)