World Power Plants

Gilman Mill4.8 MW Hydroelectric

HydroRenewableVerified: Jul 2026

Gilman Mill is a 4.8 MW hydro power plant in the United States, operated by Ampersand Gilman Hydro LP since 1966. Ranked #899 of 1469 hydro plants in the United States. Its 4.8 MW constitutes 0.004% 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 Gilman Mill 1,419 times smaller. Nearby plants include S C Moore (190.8 MW, Hydro) and Comerford (167.8 MW, Hydro). The facility is located in New Hampshire, approximately 100 km from the nearest major city, Concord.

Capacity
4.8 MW
Commissioning Year
1966

60 years old

Owner
Ampersand Gilman Hydro LP
Location
44.4122°, -71.7228°

United States of America, North America

Context & rankings
  • 6,404. largest of 10,098 plants in United States of America
  • #29,799 worldwide by installed capacity
  • #6,547 of 8,493 Hydroelectric plants worldwide
Age & fleet comparison

60 years in operation

Hydroelectric fleet average: 42.1 years

Operator portfolio

Ampersand Gilman Hydro LP operates 1 plants totalling 5 MW

Regional density

67 plants within 100 km, 1,631 MW combined

Nearest plant: GSPP Gilman LLC (0.7 km)

Location

Coordinates:: 44.412200, -71.722800
Open in Google Maps
Carbon Footprint

Zero Direct Emissions

Gilman Mill is a hydro power plant producing approximately 17 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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