Harriman — Plant Summary
- EIA Plant ID
- 3746
- Capacity
- 33.6 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Windham, VT
- Operating Since
- 1924
- Generators
- 3
- Operator
- Great River Hydro, LLC
- Parent Company
- —
- Annual Generation
- 91,466 MWh
- Capacity Factor
- 31.0%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Harriman
OperatingHydro
Ranked #4 of 45 Hydro plants in VT#381 of 1454 nationally
33.6 MW Hydro operating in Windham, VT — ISO New England Inc.
EIAWD
33.6 MW
Nameplate Capacity
3
Generators
units
Conventional Hydroelectric
Technology
1924
Operating Since
Location
Coordinates
42.7579, -72.9290
County
Windham, VT
Nearby Plants
- ShermanHydro7.2 MW · 3.1 km
- Deerfield 5Hydro17.5 MW · 7.8 km
- New England Wind LLCWind28.5 MW · 8.3 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Great River Hydro, LLC | — | — |
| Owner(s) | Great River Hydro, LLC | — | — |
| Status | Operating | — | — |
Ownership Chain
No GEM tracker match for this plant — ownership chain unavailable.
About
The Harriman hydroelectric plant is located in Windham County, Vermont. It has a total capacity of 33.6 MW across three generators and primarily uses water as its fuel source. The plant began operating in 1924 and is owned and operated by Great River Hydro, LLC. Harriman ranks as the fourth-largest of 46 power plants in Vermont and 385th-largest of 1464 plants nationally.
The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. The latest annual generation data indicates an output of 91,466 MWh, resulting in a capacity factor of 31.0%. Financial data indicates a power purchase agreement (PPA) price of $60 per MWh, as reported to FERC.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
115 kV
Regulatory Status
NR
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
Generation
7.9K MWh
Latest Month
91.5K MWh
Annual Generation
31.0%
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 confidencePoint of Interconnection
Nearest Substation
Harriman 115kV Substation · 115 kV
Substation Distance
< 10 km
Operator
National Grid
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
435
Pricing Hub
.Z.VERMONT
Node Source
EIA-860 direct report
News & Articles (5)Beta
Regulatory·ferc order
Great River Hydro, LLC; Notice of Availability of Environmental Assessment
Great River Hydro (other)
Federal Register (FERC)·3 weeks ago
General
What Lies Beneath The Lost Town of Mountain Mills
When it comes to cooling summertime fun, most Vermonters seem to agree that Harriman Reservoir, also known as Lake Whitingham, is the ideal...
The Keene Sentinel·6 years ago
Deals·m and a
ArcLight to buy TransCanada’s hydro portfolio for over $1 billion
by Timothy McQuiston Vermont Business Magazine ArcLight Capital Partners, based in Boston, announced Tuesday that its affiliate,...
ArcLight Capital Partners (buyer)TransCanada (seller)
Vermont Business Magazine·9 years ago
Industry·other
Writer tells the history of how railroad changed Vermont
Tuesday January 17, 2012. BENNINGTON -- The two volumes of Brian Donelson's "The Coming of the Train" focus not only on the Hoosac Tunnel...
Brian Donelson (other)
Brattleboro Reformer·14 years ago
Last updated 2026-03-25
View all 5 articles