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15.2 MW Batteries (8 MW) + Conventional Hydroelectric (7 MW) operating in York, ME — ISO New England Inc.
15.2 MW
Nameplate Capacity
7
Generators
units
Hybrid (2)
Technology
Batteries + Conventional Hydroelectric
1910
Operating Since
Coordinates
43.6877, -70.6115
County
York, ME
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Brookfield White Pine Hydro LLC | — | — |
| Owner(s) | Brookfield White Pine Hydro LLC | — | — |
| Status | Operating | — | — |
Bonny Eagle is a hybrid hydroelectric and battery storage power plant located in York County, Maine. The plant, which began operating in 1910, has a total capacity of 15.2 MW across 7 generators and is owned and operated by Brookfield White Pine Hydro LLC. The primary fuel source is water (WAT), and the plant incorporates both conventional hydroelectric generation and battery energy storage systems (BESS). The BESS component provides 16 MWh of storage with a duration of 2 hours, utilizing lithium-ion battery (LIB) chemistry.
The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. Bonny Eagle's latest annual generation was 32,960 MWh, resulting in a capacity factor of 24.7%. The plant ranks 14th out of 51 power plants in the state of Maine and 547th out of 1464 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
34.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP
2.8K MWh
Net Discharge
33.0K MWh
Annual Net Energy
24.7%
Capacity Factor
Positive values indicate net discharge (generation exceeds station load). Negative values indicate net charging. Pure battery storage plants are typically net negative due to round-trip efficiency losses.
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $34.9M
Market Position
ISO/RTO Market
ISO-NE
LMP Node
LD.W_BUXTON34.5
Pricing Hub
.Z.MAINE
Location Type
NETWORK NODE
Node Source
Curated node match
Last updated 2026-03-14
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