W R Gianelli
Pumped storage power plant in Merced County, California. 424 MW of nameplate capacity across 8 generators, operated by California Dept. of Water Resources.
Also known as Gianelli Powerhouse · W.R. Gianelli · WR Gianelli · EIA plant 448
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 424 MWNameplate
- Generators
- 8 operatingEIA-860M, August 2026
- Operating since
- March 1967First generator online
- Operator
- California Dept. of Water ResourcesEIA operator ID 3255
- Grid
- CAISOBalancing authority CISO
- Price nodes
- 1 CAISO nodeResource nodes with prices
- Location
- Merced County, CA37.0692, −121.0772
- EIA plant ID
- 448EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power W R Gianelli produces
Free · EIA-923Net generation, 2025
−152 GWh
−152,350 MWh, final
Capacity factor, 2025
Not reported
2024: Not reported
January to July 2026
−14.9 GWh
Provisional
Range, 2015 to 2025
−317.2–43.7
GWh a year. Low 2016, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | −315,136 | Not reported | 12 of 12 |
| 2001 | 147,783 | Not reported | 12 of 12 |
| 2002 | −137,738 | Not reported | 12 of 12 |
| 2003 | −296,900 | Not reported | 12 of 12 |
| 2004 | −401,762 | Not reported | 12 of 12 |
| 2005 | −390,893 | Not reported | 12 of 12 |
| 2006 | −206,421 | Not reported | 12 of 12 |
| 2007 | −19,957 | Not reported | 12 of 12 |
| 2008 | 183,815 | Not reported | 12 of 12 |
| 2009 | −214,142 | Not reported | 12 of 12 |
| 2010 | −345,267 | Not reported | 12 of 12 |
| 2011 | −287,497 | Not reported | 12 of 12 |
| 2012 | 89,937 | Not reported | 12 of 12 |
| 2013 | 5,507 | Not reported | 12 of 12 |
| 2014 | −142,409 | Not reported | 12 of 12 |
| 2015 | −26,449 | Not reported | 12 of 12 |
| 2016 | −317,173 | Not reported | 12 of 12 |
| 2017 | 43,670 | Not reported | 12 of 12 |
| 2018 | −125,520 | Not reported | 12 of 12 |
| 2019 | −94,960 | Not reported | 12 of 12 |
| 2020 | −24,380 | Not reported | 12 of 12 |
| 2021 | −15,460 | Not reported | 12 of 12 |
| 2022 | −92,700 | Not reported | 12 of 12 |
| 2023 | −280,710 | Not reported | 12 of 12 |
| 2024 | −208,210 | Not reported | 12 of 12 |
| 2025 | −152,350 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | −14,890 | Not reported | 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 | Hydroelectric Pumped Storage | 53.0 | June 1968 |
| 2 | Hydroelectric Pumped Storage | 53.0 | March 1968 |
| 3 | Hydroelectric Pumped Storage | 53.0 | November 1967 |
| 4 | Hydroelectric Pumped Storage | 53.0 | September 1967 |
| 5 | Hydroelectric Pumped Storage | 53.0 | August 1967 |
| 6 | Hydroelectric Pumped Storage | 53.0 | July 1967 |
| 7 | Hydroelectric Pumped Storage | 53.0 | May 1967 |
| 8 | Hydroelectric Pumped Storage | 53.0 | March 1967 |
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 California Dept. of Water Resources 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 W R Gianelli
More plants operated by California Dept. of Water Resources
Questions about W R Gianelli
How much power does W R Gianelli produce?
W R Gianelli reported −152,350 MWh (−152 GWh) of net generation in 2025. From January to July 2026 it reported −14.9 GWh, which is provisional.
Where is W R Gianelli?
W R Gianelli is in Merced County, California, at 37.0692, −121.0772. It is in the California Independent System Operator balancing area (CISO).
Who operates W R Gianelli?
EIA-860M for August 2026 lists California Dept. of Water Resources as the operator (EIA operator ID 3255). The operator is not always the owner.
When did W R Gianelli start operating?
Its first generator began operating in March 1967, according to EIA-860M.
Does InfraMap have power prices for W R Gianelli?
Yes. InfraMap has CAISO day-ahead and real-time prices at 1 price node linked to W R Gianelli, 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