Middle Fork
Hydro power plant in Placer County, California. 122.4 MW of nameplate capacity across 2 generators, operated by Placer County Water Agency - (CA).
Also known as Middle Fork Power Station · EIA plant 425
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 122.4 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- October 1966First generator online
- Operator
- Placer County Water Agency - (CA)EIA operator ID 15127
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 1 CAISO nodeResource nodes with prices
- Location
- Placer County, CA39.0248, −120.5964
- EIA plant ID
- 425EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Middle Fork produces
Free · EIA-923Net generation, 2025
424 GWh
423,606 MWh, final
Capacity factor, 2025
39.5%
2024: 40.4%
January to July 2026
265 GWh
Provisional
Range, 2015 to 2025
9.5–860.2
GWh a year. Low 2022, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 543,347 | Not reported | 12 of 12 |
| 2001 | 300,980 | Not reported | 12 of 12 |
| 2002 | 305,784 | Not reported | 12 of 12 |
| 2003 | 532,171 | Not reported | 12 of 12 |
| 2004 | 506,688 | Not reported | 12 of 12 |
| 2005 | 555,549 | Not reported | 12 of 12 |
| 2006 | 837,066 | Not reported | 12 of 12 |
| 2007 | 255,360 | Not reported | 12 of 12 |
| 2008 | 303,005 | Not reported | 12 of 12 |
| 2009 | 488,099 | Not reported | 12 of 12 |
| 2010 | 545,513 | 53.6% | 12 of 12 |
| 2011 | 780,761 | 76.8% | 12 of 12 |
| 2012 | 446,134 | 43.7% | 12 of 12 |
| 2013 | 327,117 | 32.2% | 12 of 12 |
| 2014 | 270,448 | 26.6% | 12 of 12 |
| 2015 | 159,653 | 15.7% | 12 of 12 |
| 2016 | 531,978 | Not reported | 12 of 12 |
| 2017 | 860,201 | 80.2% | 12 of 12 |
| 2018 | 451,504 | 42.1% | 12 of 12 |
| 2019 | 788,857 | 73.6% | 12 of 12 |
| 2020 | 265,910 | 24.7% | 12 of 12 |
| 2021 | 160,093 | 14.9% | 12 of 12 |
| 2022 | 9,531 | 0.9% | 12 of 12 |
| 2023 | 563,741 | 52.6% | 12 of 12 |
| 2024 | 434,565 | 40.4% | 12 of 12 |
| 2025 | 423,606 | 39.5% | 12 of 12 |
| 2026 (provisional, partial year) | 264,885 | 42.5% | 7 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 | 61.2 | October 1966 |
| 2 | Conventional Hydroelectric | 61.2 | October 1966 |
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 Placer County Water Agency - (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 Middle Fork
More plants operated by Placer County Water Agency - (CA)
Questions about Middle Fork
How much power does Middle Fork produce?
Middle Fork reported 423,606 MWh (424 GWh) of net generation in 2025, a 39.5% capacity factor on 122.4 MW of nameplate capacity. From January to July 2026 it reported 265 GWh, which is provisional.
Where is Middle Fork?
Middle Fork is in Placer County, California, at 39.0248, −120.5964. It is in the California Independent System Operator balancing area (CISO).
Who operates Middle Fork?
EIA-860M for August 2026 lists Placer County Water Agency - (CA) as the operator (EIA operator ID 15127). The operator is not always the owner.
When did Middle Fork start operating?
Its first generator began operating in October 1966, according to EIA-860M.
Does InfraMap have power prices for Middle Fork?
Yes. InfraMap has CAISO day-ahead and real-time prices at 1 price node linked to Middle Fork, 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