World Power Plants

Cobble Mountain33 MW Hydroelectric

HydroRenewableVerified: Jul 2026

Cobble Mountain is a 33 MW hydroelectric power plant in the United States, operated by the City of Holyoke Gas and Electric Dept. and commissioned in 1930. Ranked #397 of 1,469 hydro plants in the United States. Its 33 MW represents 0.03% of the country's total hydro capacity of 117,947 MW. The largest hydro plant in the United States is Grand Coulee Dam at 6,809 MW, making Cobble Mountain 206 times smaller. Nearby plants include Stony Brook (534.6 MW, Oil), Berkshire Power (289 MW, Gas), and Masspower (260.9 MW, Gas). The facility is located in Massachusetts, approximately 130 km west of Boston.

Capacity
33 MW
Commissioning Year
1930

96 years old

Owner
City of Holyoke Gas and Electric Dept.
Location
42.1171°, -72.8647°

United States of America, North America

Context & rankings
  • 3,394. largest of 10,098 plants in United States of America
  • #16,063 worldwide by installed capacity
  • #3,710 of 8,493 Hydroelectric plants worldwide
Age & fleet comparison

96 years in operation

Hydroelectric fleet average: 42.1 years

Operator portfolio

City of Holyoke Gas and Electric Dept. operates 6 plants totalling 81 MW

Regional density

370 plants within 100 km, 16,416 MW combined

Nearest plant: International Paper Woronoco Mill (6 km)

Location

Coordinates:: 42.117100, -72.864700
Open in Google Maps
Carbon Footprint

Zero Direct Emissions

Cobble Mountain is a hydro power plant producing approximately 116 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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