Middle Gorge
Mono County, California · EIA plant ID 401 · Operator: Los Angeles Department of Water & Power
Nameplate38MWSummer 38 MW
Generators1in service
Net generation48GWh12 mo to Dec 2025
Capacity factor15%hydro units, summer MW
Heat rate—thermal plants only
First online1952
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 | 63 | 18.9% | — |
| 2002 | 79 | 23.7% | — |
| 2003 | 75.6 | 22.7% | — |
| 2004 | 52.2 | 15.6% | — |
| 2005 | 112.8 | 33.9% | — |
| 2006 | 139.9 | 42.0% | — |
| 2007 | 68.7 | 20.6% | — |
| 2008 | 69.8 | 21.2% | — |
| 2009 | 52.3 | 15.9% | — |
| 2010 | 101.5 | 30.9% | — |
| 2011 | 99.1 | 30.2% | — |
| 2012 | 79.4 | 24.1% | — |
| 2013 | 37.3 | 11.4% | — |
| 2014 | 22.1 | 6.7% | — |
| 2015 | 0.3 | 0.1% | — |
| 2016 | 21.2 | 6.4% | — |
| 2017 | 143 | 43.5% | — |
| 2018 | 75.4 | 22.9% | — |
| 2019 | 95 | 28.9% | — |
| 2020 | 43 | 13.1% | — |
| 2021 | 28.9 | 8.8% | — |
| 2022 | 26 | 7.9% | — |
| 2023 | 98.9 | 30.1% | — |
| 2024 | 90.9 | 27.6% | — |
| 2025 | 48 | 14.6% | — |
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 | 37.5 | 37.5 | May 1952 | Operating | — | coming soon |
Owner / operator
Operator: Los Angeles Department of Water & Power. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Los Angeles Department of Water & Power | 100.0% | 38 MW |
Nearby plants
Within 80 km.
| Upper Gorge | 38 MW | 4.4 km |
| Control Gorge | 38 MW | 8.1 km |
| Pleasant Valley Hydro | 3 MW | 11.4 km |
| Bishop Creek 6 | 2 MW | 20.1 km |
| Bishop Creek 5 | 5 MW | 21.1 km |
| Bishop Creek 4 | 8 MW | 21.6 km |