Lake Mathews
Riverside County, California · EIA plant ID 6644 · Operator: Metropolitan Water District of S CA
Nameplate5MWSummer 5 MW
Generators1in service
Net generation6GWh12 mo to Dec 2025
Capacity factor13%hydro units, summer MW
Heat rate—thermal plants only
First online1980
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 27.7 | 63.2% | — |
| 2002 | 27.1 | 61.9% | — |
| 2003 | 9.7 | 22.1% | — |
| 2004 | 16.8 | 63.9% | — |
| 2005 | 21.9 | 83.3% | — |
| 2006 | 10 | 37.9% | — |
| 2007 | 18.2 | 69.1% | — |
| 2008 | 32.8 | 76.2% | — |
| 2009 | 31.8 | 74.0% | — |
| 2010 | 28.4 | 66.3% | — |
| 2011 | 22.8 | 53.1% | — |
| 2012 | 22.6 | 52.5% | — |
| 2013 | 28.1 | 65.4% | — |
| 2014 | 18.5 | 43.0% | — |
| 2015 | 30 | 69.9% | — |
| 2016 | 32.8 | 76.3% | — |
| 2017 | 1.7 | 3.9% | — |
| 2018 | 24.3 | 56.7% | — |
| 2019 | 3.7 | 8.7% | — |
| 2020 | 20.8 | 48.4% | — |
| 2021 | 24.8 | 57.9% | — |
| 2022 | 10.4 | 24.3% | — |
| 2023 | 3.8 | 8.8% | — |
| 2024 | 7 | 16.2% | — |
| 2025 | 5.8 | 13.5% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 4.9 | 4.9 | Aug 1980 | Operating | — | coming soon |
Owner / operator
Operator: Metropolitan Water District of S CA. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Metropolitan Water District of S CA | 100.0% | 5 MW |
Nearby plants
Within 80 km.
| Temescal | 3 MW | 4.6 km |
| Temescal Canyon RV, LLC | 2 MW | 6.2 km |
| Riverside RWQCP Fuel Cell | 1 MW | 11.8 km |
| Riverside Energy Resource Center | 196 MW | 12 km |
| Chambers 4 - Riverside LGB6 | 2 MW | 14.4 km |
| Corona | 3 MW | 14.5 km |