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550.2 MW Natural Gas operating in Penobscot, ME — ISO New England Inc.
550.2 MW
Nameplate Capacity
3
Generators
units
Natural Gas Fired Combined Cycle
Technology
2000
Operating Since
Coordinates
44.8242, -68.7094
County
Penobscot, ME
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Casco Bay Energy Co LLC | Casco Bay Energy | — |
| Owner(s) | Casco Bay Energy Co LLC | Vistra | — |
| Status | Operating | — | — |
Maine Independence Station is a 550.2 MW natural gas-fired combined cycle power plant located in Penobscot County, Maine. The plant began operating in 2000 and consists of three generators. It is owned by Vistra and operated by Casco Bay Energy Co LLC. The plant is the second-largest of five active power plants in the state, and ranks 453rd out of 945 plants nationally.
The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. In the most recent year of data, Maine Independence Station generated 2,546,844 MWh of electricity, achieving a capacity factor of 52.7%.
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
142.1K MWh
Latest Month
2.5M MWh
Annual Generation
52.7%
Capacity Factor
CO₂ Intensity
886 lb/MWh
NOx
0.118 lb/MWh
SO₂
0.004 lb/MWh
CH₄
0.016 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
19.4%
Annual Net Gen
937 GWh
CO₂eq
887 lb/MWh
Subregion
NPCC New England
2013
$965/kW
Est. Construction Cost
Total estimated cost: $531.0M
Point of Interconnection
Nearest Substation
Graham 46kV Substation · 46 kV
Substation Distance
< 10 km
Operator
Bangor Hydro-Electric Company
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
UN.Graham 18.0MS1A(40338)
Pricing Hub
.Z.MAINE
Node Source
EIA-860 direct report
Last updated 2026-04-09
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