World Power Plants

Gianelli Powerhouse424 MW Hydroelectric

HydroRenewableVerified: Feb 2026

The Gianelli Powerhouse is a historic hydroelectric facility situated in the United States, contributing significantly to the region's renewable energy generation. With a capacity of 424 MW, this powerhouse has been operational since its commissioning in 1967, making it a cornerstone of California's energy infrastructure. Utilizing dam-based hydro technology, Gianelli harnesses the flow of water to generate electricity, providing a reliable and sustainable energy source that plays a critical role in reducing greenhouse gas emissions. Located at coordinates 37.0691, -121.0774, the Gianelli Powerhouse is strategically positioned within the California landscape, optimizing water resources from the surrounding regions. The facility is owned and operated by the California Department of Water Resources, underscoring its importance in fulfilling California's ambitious renewable energy goals. As the state continues to pursue policies aimed at increasing the share of clean energy in its grid, Gianelli Powerhouse remains a vital asset, contributing to energy stability and supporting the transition towards a more sustainable energy future. Its long-standing operation exemplifies the effectiveness of hydroelectric power in meeting both current and future energy demands while promoting ecological sustainability.

Capacity
424 MW
Commissioning Year
1967

59 years old

Owner
California Dept. of Water Resources
Location
37.0691°, -121.0774°

United States of America, North America

Context & rankings
  • 961. largest of 10,098 plants in United States of America
  • #5,083 worldwide by installed capacity
  • #826 of 8,493 Hydroelectric plants worldwide
  • 0.03% of the installed capacity of United States of America
Age & fleet comparison

59 years in operation

Hydroelectric fleet average: 42.1 years

Operator portfolio

California Dept. of Water Resources operates 9 plants totalling 2,013 MW

Regional density

160 plants within 100 km, 8,470 MW combined

Nearest plant: ONeill (4.2 km)

Data provenance

Location

Coordinates:: 37.069074, -121.077423
Open in Google Maps
Carbon Footprint

Zero Direct Emissions

Gianelli Powerhouse is a hydro power plant producing approximately 1486 GWh of clean electricity per year with zero direct CO₂ emissions during operation.

Lifecycle emissions: ~24 g CO₂/kWh (manufacturing, transport, decommissioning)

Technical Details

Primary Fuel Type
Hydro
Energy Source
Renewable
Country
United States of America
Continent
North America
Data Source
Global Power Plant Database

United States of AmericaEnergy Profile

10,098
Total Plants
1420.7 GW
Total Capacity
GasCoalNuclearWind
Top Fuels

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