Lake Mathews
Hydro power plant in Riverside County, California. 4.9 MW of nameplate capacity across 1 generator, operated by Metropolitan Water District of S CA.
Also known as Lake Mathews Power Plant · EIA plant 6644
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Key facts
- Capacity
- 4.9 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- August 1980First 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
- Riverside County, CA33.8553, −117.4537
- EIA plant ID
- 6644EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Lake Mathews produces
Free · EIA-923Net generation, 2025
5.78 GWh
5,778 MWh, final
Capacity factor, 2025
13.5%
2024: 16.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
1.7–32.8
GWh a year. Low 2017, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 0 | Not reported | 12 of 12 |
| 2001 | 27,675 | Not reported | 12 of 12 |
| 2002 | 27,090 | Not reported | 12 of 12 |
| 2003 | 9,690 | Not reported | 12 of 12 |
| 2004 | 16,845 | Not reported | 12 of 12 |
| 2005 | 21,889 | Not reported | 12 of 12 |
| 2006 | 9,959 | Not reported | 12 of 12 |
| 2007 | 18,157 | Not reported | 12 of 12 |
| 2008 | 32,786 | Not reported | 12 of 12 |
| 2009 | 31,760 | Not reported | 12 of 12 |
| 2010 | 28,444 | 66.3% | 12 of 12 |
| 2011 | 22,779 | 53.1% | 12 of 12 |
| 2012 | 22,585 | 52.5% | 12 of 12 |
| 2013 | 28,071 | 65.4% | 12 of 12 |
| 2014 | 18,451 | 43.0% | 12 of 12 |
| 2015 | 30,002 | 69.9% | 12 of 12 |
| 2016 | 32,845 | 76.3% | 12 of 12 |
| 2017 | 1,666 | 3.9% | 12 of 12 |
| 2018 | 24,337 | 56.7% | 12 of 12 |
| 2019 | 3,733 | 8.7% | 12 of 12 |
| 2020 | 20,834 | 48.4% | 12 of 12 |
| 2021 | 24,831 | 57.8% | 12 of 12 |
| 2022 | 10,446 | 24.3% | 12 of 12 |
| 2023 | 3,768 | 8.8% | 12 of 12 |
| 2024 | 6,950 | 16.1% | 12 of 12 |
| 2025 | 5,778 | 13.5% | 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 | 4.9 | August 1980 |
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 Lake Mathews
More plants operated by Metropolitan Water District of S CA
Questions about Lake Mathews
How much power does Lake Mathews produce?
Lake Mathews reported 5,778 MWh (5.78 GWh) of net generation in 2025, a 13.5% capacity factor on 4.9 MW of nameplate capacity.
Where is Lake Mathews?
Lake Mathews is in Riverside County, California, at 33.8553, −117.4537. It is in the California Independent System Operator balancing area (CISO).
Who operates Lake Mathews?
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 Lake Mathews start operating?
Its first generator began operating in August 1980, according to EIA-860M.
Does InfraMap have power prices for Lake Mathews?
Yes. InfraMap has CAISO day-ahead and real-time prices at 1 price node linked to Lake Mathews, 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