Middle Fork
Placer County, California · EIA plant ID 425 · Operator: Placer County Water Agency
Nameplate122MWSummer 132 MW
Generators2in service
Net generation484GWh12 mo to Aug 2026
Capacity factor42%hydro units, summer MW
Heat rate—thermal plants only
First online1966
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
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 | 301 | 26.0% | — |
| 2002 | 305.8 | 26.4% | — |
| 2003 | 532.2 | 45.7% | — |
| 2004 | 506.7 | 43.4% | — |
| 2005 | 555.5 | 47.7% | — |
| 2006 | 837.1 | 71.9% | — |
| 2007 | 255.4 | 23.9% | — |
| 2008 | 303 | 28.3% | — |
| 2009 | 488.1 | 45.7% | — |
| 2010 | 545.5 | 51.0% | — |
| 2011 | 780.8 | 73.1% | — |
| 2012 | 446.1 | 41.6% | — |
| 2013 | 327.1 | 30.6% | — |
| 2014 | 270.4 | 25.3% | — |
| 2015 | 159.7 | 14.9% | — |
| 2016 | 532 | 45.9% | — |
| 2017 | 860.2 | 74.4% | — |
| 2018 | 451.5 | 39.1% | — |
| 2019 | 788.9 | 68.2% | — |
| 2020 | 265.9 | 22.9% | — |
| 2021 | 160.1 | 13.9% | — |
| 2022 | 9.5 | 0.8% | — |
| 2023 | 563.7 | 48.8% | — |
| 2024 | 434.6 | 37.5% | — |
| 2025 | 423.6 | 36.6% | — |
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 | 61.2 | 66 | Oct 1966 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 61.2 | 66 | Oct 1966 | Operating | — | coming soon |
Owner / operator
Operator: Placer County Water Agency. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Placer County Water Agency | 100.0% | 122 MW |
Nearby plants
Within 80 km.
| Ralston | 79 MW | 11.4 km |
| Oxbow (CA) | 6 MW | 13.2 km |
| French Meadows | 15 MW | 17.5 km |
| Jaybird | 162 MW | 21.9 km |
| Union Valley | 39 MW | 22.2 km |
| Camino | 158 MW | 22.4 km |