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263.6 MW Natural Gas operating in Norfolk, MA — ISO New England Inc.
263.6 MW
Nameplate Capacity
2
Generators
units
Natural Gas Fired Combustion Turbine
Technology
2019
Operating Since
Coordinates
42.1372, -71.4447
County
Norfolk, MA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Constellation Power, Inc | Constellation Power | — |
| Owner(s) | Constellation Power, Inc | Constellation Energy | — |
| Status | Operating | — | — |
Exelon West Medway II LLC is a 263.6 MW natural gas-fired power plant located in Norfolk County, Massachusetts. The plant began operating in 2019 and is owned by Constellation Energy and operated by Constellation Power, Inc. It consists of two natural gas-fired combustion turbine generators. The plant is located within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region.
In its most recent year of operation, Exelon West Medway II LLC generated 210,885 MWh of electricity, achieving a capacity factor of 9.1%. The plant is ranked as the 8th largest of 15 power plants in Massachusetts, and 687th out of 945 plants nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
ISO-NE
Market
ISO/RTO Member
NERC Region
NPCC — Northeast Power Coordinating Council
Balancing Authority
ISO New England Inc. (ISNE)
Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
27.3K MWh
Latest Month
210.9K MWh
Annual Generation
9.1%
Capacity Factor
CO₂ Intensity
1177 lb/MWh
NOx
0.091 lb/MWh
SO₂
0.006 lb/MWh
CH₄
0.023 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
7.1%
Annual Net Gen
164 GWh
CO₂eq
1178 lb/MWh
Subregion
NPCC New England
2019
$1,078/kW
Est. Construction Cost
Total estimated cost: $284.2M
Point of Interconnection
Nearest Substation
Medway Substation No. 65
Substation Distance
< 10 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
UN.MEDWAY 13.8WMJ4
Pricing Hub
.H.INTERNAL_HUB
Location Type
NETWORK NODE
Node Source
EIA-860 direct report
Last updated 2026-03-26
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