167.8 MW Hydro operating in Grafton, NH — ISO New England Inc.
167.8 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1930
Operating Since
Coordinates
44.3251, -72.0010
County
Grafton, NH
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Great River Hydro, LLC | Great River Hydro LLC [100%] | — |
| Owner(s) | Great River Hydro, LLC | Great River Hydro LLC [100%] | — |
| Status | Operating | operating | — |
GEM identifies the owner as Great River Hydro LLC [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
Frank D. Comerford Dam is an International Style concrete dam in the Fifteen Mile Falls of the Connecticut River, on the border between the U.S. states of New Hampshire and Vermont. The dam is near Monroe, New Hampshire and Barnet, Vermont. Construction began in 1928 and was completed in 1931. The dam and the power plant were acquired by a subsidiary of Hydro-Québec from Great River Hydro, LLC, in October 2022.
Read more on WikipediaThe Comerford hydroelectric plant is located in Grafton County, New Hampshire. The plant has a total capacity of 167.8 MW across four generators and primarily uses water as its fuel source. It began operating in 1930 and is owned and operated by Great River Hydro, LLC. Comerford is the second-largest hydroelectric plant in New Hampshire, and ranks 118th nationally among hydroelectric facilities.
The plant operates within the ISO New England Inc. balancing authority and the NPCC NERC region. Its latest annual generation was 400,481 MWh, resulting in a capacity factor of 27.1%. Financial data indicates a power purchase agreement (PPA) price of $60 per MWh, as reported in FERC EQRs.
Generated from EIA, GEM, and public data sources
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
230 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
33.8K MWh
Latest Month
400.5K MWh
Annual Generation
27.1%
Capacity Factor
$60.0/MWh
PPA Price
Great River Hydro, LLC
Contract Seller
Market Position
ISO/RTO Market
ISO-NE
LMP Node
47367
Pricing Hub
.Z.NEWHAMPSHIRE
Node Source
EIA-860 direct report
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Last updated 2026-03-25
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