San Dimas
Hydro power plant in Los Angeles County, California. 9.9 MW of nameplate capacity across 1 generator, operated by Metropolitan Water District of S CA.
Also known as EIA plant 6646
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 9.9 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- June 1981First generator online
- Operator
- Metropolitan Water District of S CAEIA operator ID 12397
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 1 CAISO nodeResource nodes with prices
- Location
- Los Angeles County, CA34.1275, −117.7958
- EIA plant ID
- 6646EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power San Dimas produces
Free · EIA-923Net generation, 2025
10.3 GWh
10,342 MWh, final
Capacity factor, 2025
11.9%
2024: 0.0%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
0.0–54.1
GWh a year. Low 2021, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 0 | Not reported | 12 of 12 |
| 2001 | 33,920 | Not reported | 12 of 12 |
| 2002 | 45,264 | Not reported | 12 of 12 |
| 2003 | 63,237 | Not reported | 12 of 12 |
| 2004 | 65,431 | Not reported | 12 of 12 |
| 2005 | 55,717 | Not reported | 12 of 12 |
| 2006 | 63,864 | Not reported | 12 of 12 |
| 2007 | 49,709 | Not reported | 12 of 12 |
| 2008 | 23,670 | Not reported | 12 of 12 |
| 2009 | 0 | Not reported | 12 of 12 |
| 2010 | 37,070 | 42.7% | 12 of 12 |
| 2011 | 53,085 | 61.2% | 12 of 12 |
| 2012 | 42,739 | 49.1% | 12 of 12 |
| 2013 | 21,567 | 24.9% | 12 of 12 |
| 2014 | 2,933 | 3.4% | 12 of 12 |
| 2015 | 24,159 | 27.9% | 12 of 12 |
| 2016 | 38,554 | 44.3% | 12 of 12 |
| 2017 | 54,133 | 62.4% | 12 of 12 |
| 2018 | 27,059 | 31.2% | 12 of 12 |
| 2019 | 35,838 | 41.3% | 12 of 12 |
| 2020 | 5,074 | 5.8% | 12 of 12 |
| 2021 | 0 | 0.0% | 12 of 12 |
| 2022 | 4,035 | 4.7% | 12 of 12 |
| 2023 | 24,619 | 28.4% | 12 of 12 |
| 2024 | 0 | 0.0% | 12 of 12 |
| 2025 | 10,342 | 11.9% | 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 |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 9.9 | June 1981 |
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 Metropolitan Water District of S 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 San Dimas
More plants operated by Metropolitan Water District of S CA
Questions about San Dimas
How much power does San Dimas produce?
San Dimas reported 10,342 MWh (10.3 GWh) of net generation in 2025, a 11.9% capacity factor on 9.9 MW of nameplate capacity.
Where is San Dimas?
San Dimas is in Los Angeles County, California, at 34.1275, −117.7958. It is in the California Independent System Operator balancing area (CISO).
Who operates San Dimas?
EIA-860M for August 2026 lists Metropolitan Water District of S CA as the operator (EIA operator ID 12397). The operator is not always the owner.
When did San Dimas start operating?
Its first generator began operating in June 1981, according to EIA-860M.
Does InfraMap have power prices for San Dimas?
Yes. InfraMap has CAISO day-ahead and real-time prices at 1 price node linked to San Dimas, 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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page