7 MW Batteries (2 MW) + Solar Photovoltaic (5 MW) operating in Chittenden, VT — ISO New England Inc.
7 MW
Nameplate Capacity
2
Generators
units
Hybrid (2)
Technology
Batteries + Solar Photovoltaic
2019
Operating Since
Coordinates
44.3921, -73.1023
County
Chittenden, VT
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Green Mountain Power Corp | Green Mountain Power | — |
| Owner(s) | GMP VT Microgrid LLC | GMP VT Microgrid LLC [100%] | — |
| Status | Operating | operating | — |
GEM identifies the owner as GMP VT Microgrid LLC [100%]
This entity is not yet in the GEM ownership database — chain unavailable.
Located in Chittenden County, Vermont, the GMP Solar/Storage-Milton Hybrid facility is a 7 MW hybrid power plant consisting of solar photovoltaic generation and battery energy storage. The plant, which began operating in 2019, is owned and operated by Green Mountain Power Corp. It is the second-largest solar facility in Vermont out of 8, and ranks 921st nationally among 1205 solar plants. The facility connects to the ISO New England Inc. balancing authority and is within the NPCC NERC region.
The hybrid plant utilizes fixed-tilt solar tracking. Its battery energy storage system (BESS) has a total capacity of 8 MWh and a duration of 4 hours, employing lithium-ion battery chemistry (LIB). In its latest year of operation, the plant generated 7,117 MWh, resulting in a capacity factor of 11.6%. Financial data indicates that the plant's economics are tracked by Lawrence Berkeley National Laboratory (LBNL) solar data.
Generated from EIA, GEM, and public data sources
NERC Region
NPCC
Balancing Authority
ISO New England Inc.
Grid Voltage
12.47 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
109 MWh
Latest Month
7.1K MWh
Annual Generation
11.6%
Capacity Factor
$74.6/MWh
LCOE (Levelized Cost)
$31.4/MWh
Energy Value
Point of Interconnection
Nearest Substation
Williston Substation · 115 kV
Substation Distance
< 10 km
Operator
Vermont Electric Power Company
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
—
Pricing Hub
.Z.VERMONT
Node Source
OSM spatial match
Substation identified. Node ID not yet resolved against ISO roster.
Green Mountain Power Corporation; Notice of Application Ready for Environmental Analysis and Soliciting Comments, Recommendations, Terms and Conditions, and Prescriptions
Last updated 2026-03-25
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