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862.7 MW Batteries (17 MW) + Petroleum Liquids (846 MW) operating in Cumberland, ME — ISO New England Inc.
862.7 MW
Nameplate Capacity
5
Generators
units
Hybrid (2)
Technology
Batteries + Petroleum Liquids
1957
Operating Since
Coordinates
43.7508, -70.1567
County
Cumberland, ME
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | FPL Energy Wyman LLC | FPL Energy Wyman | — |
| Owner(s) | Constellation Nuclear, FPL Energy Wyman LLC, Green Mountain Power Corp, Massachusetts Mun Wholes Electric Co, Public Service Co of NH, The Town of Lyndon Electric Department | NextEra Energy Maine | — |
| Status | Operating | — | — |
The William F Wyman Hybrid plant, located in Cumberland County, Maine, is a hybrid power plant primarily fueled by residual fuel oil (RFO). With a total capacity of 862.7 MW across 5 generators, it began operating in 1957. The plant is owned by NextEra Energy Maine and operated by FPL Energy Wyman LLC. It also incorporates battery energy storage, making it a hybrid facility. The battery energy storage system (BESS) has a capacity of 10.9 MWh, with a duration of 0.65 hours, and utilizes lithium-ion battery (LIB) chemistry.
The William F Wyman Hybrid plant operates within the ISO New England Inc. balancing authority and the NPCC NERC region. In the most recent year with available data, the plant generated 138,117 MWh, resulting in a capacity factor of 1.8%. The plant holds the distinction of being the largest of its kind in Maine (ranked 1 of 1) and ranks third nationally among similar facilities (ranked 3 of 6).
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
345.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
86.8K MWh
Latest Month
138.1K MWh
Annual Generation
1.8%
Capacity Factor
CO₂ Intensity
2250 lb/MWh
Low-utilization plant — per-MWh rate is dominated by startup/standby emissions; not directly comparable to baseload averages.
NOx
2 lb/MWh
SO₂
7 lb/MWh
CH₄
0.088 lb/MWh
N₂O
0.018 lb/MWh
Capacity Factor
0.5%
Annual Net Gen
39 GWh
CO₂eq
2257 lb/MWh
Subregion
NPCC New England
2013
$765/kW
Est. Construction Cost
Total estimated cost: $659.6M
Point of Interconnection
Nearest Substation
Yarmouth 4 Substation · 345 kV
Substation Distance
0.106 km
Operator
Central Maine Power Company
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
UN.YARMOUTH13.8YAR3
Pricing Hub
.Z.MAINE
Location Type
NETWORK NODE
Node Source
Curated node match
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