Comerford — Plant Summary
- EIA Plant ID
- 2349
- Capacity
- 167.8 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Grafton, NH
- Operating Since
- 1930
- Generators
- 4
- Operator
- Great River Hydro, LLC
- Parent Company
- —
- Annual Generation
- 400,481 MWh
- Capacity Factor
- 27.1%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Comerford
OperatingHydro
Ranked #2 of 32 Hydro plants in NH#118 of 1454 nationally
167.8 MW Hydro operating in Grafton, NH — ISO New England Inc.
EIAGEMWD
167.8 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1930
Operating Since
Location
Coordinates
44.3251, -72.0010
County
Grafton, NH
Nearby Plants
- East BarnetHydro2.2 MW · 2.8 km
- McindoesHydro10.4 MW · 8.6 km
- S C MooreHydro195.4 MW · 10.2 km
Ownership & Operator
| 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 | — |
Ownership Chain
GEM identifies the owner as Great River Hydro LLC [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
About
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
Engineering & Generators
Grid Context
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
Generation
33.8K MWh
Latest Month
400.5K MWh
Annual Generation
27.1%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: FERC Electric Quarterly ReportsMEDIUM
$60.0/MWh
PPA Price
Great River Hydro, LLC
Contract Seller
Pricing & Market Data
HIGH confidenceMarket Position
ISO/RTO Market
ISO-NE
LMP Node
47367
Pricing Hub
.Z.NEWHAMPSHIRE
Node Source
EIA-860 direct report
News & Articles (7)Beta
Regulatory·permitting
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Federal Register (FERC)·3 weeks ago
Regulatory·permitting
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Federal Register (FERC)·3 weeks ago
Regulatory·permitting
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Federal Register (FERC)·3 weeks ago
Regulatory·permitting
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Federal Register (FERC)·3 weeks ago
Last updated 2026-03-25
View all 7 articles