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30.5 MW Hydro operating in Fairfield, CT — ISO New England Inc.
30.5 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1919
Operating Since
Coordinates
41.3833, -73.1714
County
Fairfield, CT
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | FirstLight Power Resources Services LLC | — | — |
| Owner(s) | FirstLight Hydro Generating Company | — | — |
| Status | Operating | — | — |
The Stevenson Dam Hydroelectric Plant is a hydroelectric power plant located on the Housatonic River at the boundary between the towns of Monroe and Oxford, Connecticut. The Connecticut Light and Power Company began construction in 1917 and FirstLight Power has since gained ownership. It was listed on the National Register of Historic Places in 2000 and is considered to have high hazard potential by the National Inventory of Dams. The site includes three contributing structures: the Stevenson Dam, the Stevenson Dam Bridge, and the Stevenson Powerhouse.
Read more on WikipediaThe Stevenson hydroelectric plant is located in Fairfield County, Connecticut. The plant, which began operating in 1919, has a total capacity of 30.5 MW across four generators. It is owned and operated by FirstLight Power Resources Services LLC. The plant utilizes conventional hydroelectric technology and its primary fuel source is water (WAT).
Stevenson is the third-largest hydroelectric plant in Connecticut (out of 14) and ranks 404th nationally (out of 1464). In the most recent year with available data, the plant generated 95,790 MWh, achieving a capacity factor of 35.8%. The plant operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region.
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
6.3K MWh
Latest Month
95.8K MWh
Annual Generation
35.8%
Capacity Factor
2013
$2,294/kW
Est. Construction Cost
Total estimated cost: $70.0M
Point of Interconnection
Nearest Substation
Stevenson Substation · 115 kV
Substation Distance
0.106 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
UN.STEVENSN6.9 STEV
Pricing Hub
.Z.CONNECTICUT
Location Type
NETWORK NODE
Node Source
Curated node match
Last updated 2026-03-14
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Grid Voltage
115.0 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP