Marshfield 6 — Plant Summary
- EIA Plant ID
- 3739
- Capacity
- 5 MW
- Primary Fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Status
- Operating
- Location
- Washington, VT
- Operating Since
- 1927
- Generators
- 1
- Operator
- Green Mountain Power Corp
- Parent Company
- small shareholder(s)
- Annual Generation
- 8,100 MWh
- Capacity Factor
- 18.3%
- Balancing Authority
- ISO New England Inc.
- ISO/RTO
- ISONE
- NERC Region
- NPCC
Marshfield 6
OperatingHydro
Ranked #16 of 45 Hydro plants in VT#878 of 1454 nationally
5 MW Hydro operating in Washington, VT — ISO New England Inc.
EIAWD
5 MW
Nameplate Capacity
1
Generators
unit
Conventional Hydroelectric
Technology
1927
Operating Since
Location
Coordinates
44.3606, -72.3356
County
Washington, VT
Nearby Plants
- West Danville 15Hydro1 MW · 12.7 km
- ER Center Road Solar, LLCSolar2.1 MW · 16.4 km
- Billings RoadSolar1.7 MW · 18.3 km
Ownership & Operator
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Green Mountain Power Corp | Green Mountain Power | — |
| Owner(s) | Green Mountain Power Corp | small shareholder(s) | — |
| Status | Operating | — | — |
Ownership Chain
About
Marshfield 6 is a 5 MW conventional hydroelectric power plant located in Washington County, Vermont. The plant began operating in 1927 and has one generator. It is owned by a group of small shareholders and operated by Green Mountain Power Corp. The plant's primary fuel source is water (WAT). Marshfield 6 is ranked as the 17th largest power plant in Vermont out of 46, and 896th nationally out of 1464 plants.
In the latest year with available data, Marshfield 6 generated 8,100 MWh of electricity, resulting in a capacity factor of 18.3%. The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. Financial data indicates an installed cost of $2,805.26 per kW, based on FERC filings.
Generated from EIA, GEM, and public data sources
Engineering & Generators
Grid Context
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
34.5 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Generation
1.4K MWh
Latest Month
8.1K MWh
Annual Generation
18.3%
Capacity Factor
Jan 2022 – Dec 2024
Financial DataBeta
Source: FERC Form 1HIGH
$7,071/kW
Installed Cost
Green Mountain Power Corp
Reporting Utility
Cumulative Installed Cost
Per-Unit Cost Trends
Pricing & Market Data
HIGH confidencePoint of Interconnection
Nearest Substation
Marshfield-6 Substation · 35 kV
Substation Distance
< 10 km
Operator
Green Mountain Power
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
—
Pricing Hub
.Z.VERMONT
Node Source
OSM spatial match
Substation identified. Node ID not yet resolved against ISO roster.
News & Articles (9)Beta
Regulatory·permitting
Green Mountain Power Corporation; Notice of Application Ready for Environmental Analysis and Soliciting Comments, Recommendations, Terms and Conditions, and Prescriptions
Federal Register (FERC)·1 weeks ago
Regulatory·permitting
Green Mountain Power Corporation; Notice of Application Ready for Environmental Analysis and Soliciting Comments, Recommendations, Terms and Conditions, and Prescriptions
Federal Register (FERC)·1 weeks ago
General
Green Mountain Power seeks to install up to 1,200 storage batteries in remote homes
The state's largest electric utility is asking state regulators to approve a new tariff for all its ratepayers that would fund a project to...
Vermont Public·9 months ago
General
Green Mountain Power seeks to install up to 1,200 storage batteries in remote homes
The state's largest electric utility is asking state regulators to approve a new tariff for all its ratepayers that would fund a project to...
Vermont Public·9 months ago
Last updated 2026-03-25
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