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158 MW Batteries (20 MW) + Conventional Hydroelectric (138 MW) operating in Penobscot, ME
158 MW
Nameplate Capacity
33
Generators
units
Hybrid (2)
Technology
Batteries + Conventional Hydroelectric
1917
Operating Since
Coordinates
45.6472, -68.7044
County
Penobscot, ME
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Great Lakes Hydro America LLC | — | — |
| Owner(s) | Great Lakes Hydro America LLC | — | — |
| Status | Operating | — | — |
Located in Penobscot County, Maine, the Great Lakes Hydro America - ME plant has a total capacity of 158 MW. The facility, which began operating in 1917, is owned and operated by Great Lakes Hydro America LLC. The plant utilizes conventional hydroelectric technology and water (WAT) as its primary fuel source. It also incorporates battery storage, making it a hybrid facility. The battery energy storage system (BESS) has a storage capacity of 10 MWh and a duration of 1 hour, utilizing lithium-ion (LIB) chemistry.
The plant consists of 33 generators and 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 570,871 MWh, achieving a capacity factor of 41.2%. Great Lakes Hydro America - ME is ranked as the largest hydroelectric plant in the state of Maine and holds a national ranking of 125 out of 194 similar facilities.
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
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
40.9K MWh
Latest Month
570.9K MWh
Annual Generation
41.2%
Capacity Factor
Forward-looking generation outlook with probabilistic ranges across weather, demand, and policy scenarios. Powered by InfraSure's generation modeling stack.
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2013
$913/kW
Est. Construction Cost
Total estimated cost: $144.3M
Forward revenue, DSCR bands, and refinancing risk projected under price, demand, and policy scenarios. Powered by InfraSure's asset cashflow stack.
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Market Position
ISO/RTO Market
ISO-NE
LMP Node
69256
Pricing Hub
.Z.MAINE
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
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