Lake Mathews
Hydro power plant · Riverside County, California
Nameplate capacity
4.9 MW
Rank in California
#1040
of 1,897 plants
In service since
1980
August 1980
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- Metropolitan Water District of S CA
- County
- Riverside County
- Generating units
- 1
- Share of state capacity
- 0.00%
- Rank among hydro plants in California
- #165 of 244
- EIA plant code
- 6644
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | 4.9 MW | 4.9 MW | 1980 | Operating |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in California
| Equinix Lundy Ave. Fuel Cell | Natural gas | 4.9 MW |
| Kekawaka Power House | Hydro | 4.9 MW |
| OCSD | Battery storage | 4.9 MW |
| Equinix Caspian Dr. Fuel Cell | Natural gas | 4.8 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 4.9 MW solar plant and a 4.9 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All California power plants · What California actually generates