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37.2 MW Hydro operating in New Haven, CT — ISO New England Inc.
37.2 MW
Nameplate Capacity
1
Generators
unit
Conventional Hydroelectric
Technology
1955
Operating Since
Coordinates
41.4484, -73.2953
County
New Haven, CT
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | FirstLight Power Resources Services LLC | — | — |
| Owner(s) | FirstLight Hydro Generating Company | — | — |
| Status | Operating | — | — |
The Shepaug hydroelectric plant is located in New Haven County, Connecticut. It began operating in 1955 and has a total capacity of 37.2 MW from a single generator. The plant is owned and operated by FirstLight Power Resources Services LLC. Shepaug utilizes conventional hydroelectric technology with water (WAT) as its primary fuel source.
Shepaug is the largest of 14 hydroelectric plants in Connecticut, and ranks 372nd out of 1464 nationally. The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. In the latest year of reported data, Shepaug generated 116,629 MWh, achieving a capacity factor of 35.7%.
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
7.9K MWh
Latest Month
116.6K MWh
Annual Generation
35.7%
Capacity Factor
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $85.4M
Point of Interconnection
Nearest Substation
Shepaug Substation · 115 kV
Substation Distance
0.092 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
LD.SHEPAUG 69
Pricing Hub
.Z.CONNECTICUT
Location Type
NETWORK NODE
Node Source
Curated node match
Last updated 2026-03-26
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ask pi about ShepaugISO New England Inc. (ISNE)
Grid Voltage
69.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP