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31 MW Hydro operating in Litchfield, CT — ISO New England Inc.
31 MW
Nameplate Capacity
3
Generators
units
Hydroelectric Pumped Storage
Technology
1928
Operating Since
Coordinates
41.5826, -73.4347
County
Litchfield, CT
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | FirstLight Power Resources Services LLC | — | — |
| Owner(s) | FirstLight Hydro Generating Company | — | — |
| Status | Operating | — | — |
Rocky River is a hydroelectric pumped storage power plant located in Litchfield County, Connecticut. The plant has a total capacity of 31 MW across three generators. It began operating in 1928 and is owned and operated by FirstLight Power Resources Services LLC. The plant utilizes water as its primary fuel source.
Rocky River operates within the ISO New England Inc. balancing authority and the Northeast Power Coordinating Council (NPCC) NERC region. It is the second-largest of 14 hydroelectric plants in Connecticut, and ranks 402nd out of 1464 hydroelectric 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
1.3K MWh
Net Discharge
-2.4K MWh
Annual Net Energy
-0.9%
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: $71.1M
Point of Interconnection
Nearest Substation
Rocky River Substation · 115 kV
Substation Distance
0.054 km
Operator
Eversource
Coord Source
OSM spatial
Market Position
ISO/RTO Market
ISO-NE
LMP Node
LD.ROCKY_RV13.8
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 Rocky River (CT)ISO New England Inc. (ISNE)
Grid Voltage
13.8 kV
Regulatory Status
NR — Non-Regulated
Entity Type
Independent Power Producer
Sector
IPP Non-CHP