Mammoth Pool
Hydro power plant in Madera County, California. 190 MW of nameplate capacity across 2 generators, operated by Southern California Edison Co.
Also known as Mammoth Pool Power Station · EIA plant 344
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Key facts
- Capacity
- 190 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- March 1960First generator online
- Operator
- Southern California Edison CoEIA operator ID 17609
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 2 CAISO nodesResource nodes with prices
- Location
- Madera County, CA37.2203, −119.3380
- EIA plant ID
- 344EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Mammoth Pool produces
Free · EIA-923Net generation, 2025
466 GWh
465,889 MWh, final
Capacity factor, 2025
28.0%
2024: 24.8%
January to July 2026
443 GWh
Provisional
Range, 2015 to 2025
137.6–970.3
GWh a year. Low 2015, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 616,531 | Not reported | 12 of 12 |
| 2001 | 428,952 | Not reported | 12 of 12 |
| 2002 | 487,037 | Not reported | 12 of 12 |
| 2003 | 512,986 | Not reported | 12 of 12 |
| 2004 | 500,302 | Not reported | 12 of 12 |
| 2005 | 675,557 | Not reported | 12 of 12 |
| 2006 | 760,487 | Not reported | 12 of 12 |
| 2007 | 259,100 | Not reported | 12 of 12 |
| 2008 | 296,341 | Not reported | 12 of 12 |
| 2009 | 541,866 | Not reported | 12 of 12 |
| 2010 | 708,585 | 42.6% | 12 of 12 |
| 2011 | 753,863 | 45.3% | 12 of 12 |
| 2012 | 290,953 | 17.4% | 12 of 12 |
| 2013 | 355,683 | 21.4% | 12 of 12 |
| 2014 | 217,263 | 13.1% | 12 of 12 |
| 2015 | 137,647 | 8.3% | 12 of 12 |
| 2016 | 632,582 | 37.9% | 12 of 12 |
| 2017 | 970,250 | 58.3% | 12 of 12 |
| 2018 | 443,429 | 26.6% | 12 of 12 |
| 2019 | 513,546 | 30.9% | 12 of 12 |
| 2020 | 320,642 | 19.2% | 12 of 12 |
| 2021 | 293,325 | 17.6% | 12 of 12 |
| 2022 | 507,648 | 30.5% | 12 of 12 |
| 2023 | 449,030 | 27.0% | 12 of 12 |
| 2024 | 413,586 | 24.8% | 12 of 12 |
| 2025 | 465,889 | 28.0% | 12 of 12 |
| 2026 (provisional, partial year) | 442,980 | 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 | 95.0 | March 1960 |
| 2 | Conventional Hydroelectric | 95.0 | March 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 Southern California Edison Co 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 Mammoth Pool
More plants operated by Southern California Edison Co
Questions about Mammoth Pool
How much power does Mammoth Pool produce?
Mammoth Pool reported 465,889 MWh (466 GWh) of net generation in 2025, a 28.0% capacity factor on 190 MW of nameplate capacity. From January to July 2026 it reported 443 GWh, which is provisional.
Where is Mammoth Pool?
Mammoth Pool is in Madera County, California, at 37.2203, −119.3380. It is in the California Independent System Operator balancing area (CISO).
Who operates Mammoth Pool?
EIA-860M for August 2026 lists Southern California Edison Co as the operator (EIA operator ID 17609). The operator is not always the owner.
When did Mammoth Pool start operating?
Its first generator began operating in March 1960, according to EIA-860M.
Does InfraMap have power prices for Mammoth Pool?
Yes. InfraMap has CAISO day-ahead and real-time prices at 2 price nodes linked to Mammoth Pool, 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