Rocky River (CT)
Pumped storage power plant in Litchfield County, Connecticut. 31 MW of nameplate capacity across 3 generators, operated by FirstLight Power Resources Services LLC.
Also known as Rocky River Power Plant · EIA plant 539
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 31 MWNameplate
- Generators
- 3 operatingEIA-860M, August 2026
- Operating since
- January 1928First generator online
- Operator
- FirstLight Power Resources Services LLCEIA operator ID 54895
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Litchfield County, CT41.5826, −73.4349
- EIA plant ID
- 539EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Rocky River (CT) produces
Free · EIA-923Net generation, 2025
−2.45 GWh
−2,448 MWh, final
Capacity factor, 2025
Not reported
2024: Not reported
January to July 2026
−3.31 GWh
Provisional
Range, 2015 to 2025
−3.7–5.6
GWh a year. Low 2015, high 2016
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 6,031 | Not reported | 12 of 12 |
| 2001 | 0 | Not reported | 12 of 12 |
| 2002 | 18,001 | Not reported | 12 of 12 |
| 2003 | 14,380 | Not reported | 12 of 12 |
| 2004 | 14,666 | Not reported | 12 of 12 |
| 2005 | 13,213 | Not reported | 12 of 12 |
| 2006 | 19,283 | Not reported | 12 of 12 |
| 2007 | −2,353 | Not reported | 12 of 12 |
| 2008 | 6,791 | Not reported | 12 of 12 |
| 2009 | 5,385 | Not reported | 12 of 12 |
| 2010 | 9,492 | Not reported | 12 of 12 |
| 2011 | 5,604 | Not reported | 12 of 12 |
| 2012 | 2,716 | Not reported | 12 of 12 |
| 2013 | −1,051 | Not reported | 12 of 12 |
| 2014 | 6,782 | Not reported | 12 of 12 |
| 2015 | −3,707 | Not reported | 12 of 12 |
| 2016 | 5,587 | Not reported | 12 of 12 |
| 2017 | 1,797 | Not reported | 12 of 12 |
| 2018 | 3,471 | Not reported | 12 of 12 |
| 2019 | 2,155 | Not reported | 12 of 12 |
| 2020 | 1,321 | Not reported | 12 of 12 |
| 2021 | 433 | Not reported | 12 of 12 |
| 2022 | 1,309 | Not reported | 12 of 12 |
| 2023 | 4,521 | Not reported | 12 of 12 |
| 2024 | 4,514 | Not reported | 12 of 12 |
| 2025 | −2,448 | Not reported | 12 of 12 |
| 2026 (provisional, partial year) | −3,306 | Not reported | 7 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free account · ISONEEmissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| 1 | Hydroelectric Pumped Storage | 3.5 | January 1929 |
| 2 | Hydroelectric Pumped Storage | 3.5 | January 1928 |
| 3 | Hydroelectric Pumped Storage | 24.0 | January 1928 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists FirstLight Power Resources Services LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Power plants near Rocky River (CT)
More plants operated by FirstLight Power Resources Services LLC
Questions about Rocky River (CT)
How much power does Rocky River (CT) produce?
Rocky River (CT) reported −2,448 MWh (−2.45 GWh) of net generation in 2025. From January to July 2026 it reported −3.31 GWh, which is provisional.
Where is Rocky River (CT)?
Rocky River (CT) is in Litchfield County, Connecticut, at 41.5826, −73.4349. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Rocky River (CT)?
EIA-860M for August 2026 lists FirstLight Power Resources Services LLC as the operator (EIA operator ID 54895). The operator is not always the owner.
When did Rocky River (CT) start operating?
Its first generator began operating in January 1928, according to EIA-860M.
Does InfraMap have power prices for Rocky River (CT)?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Rocky River (CT), with the hub price and node-to-hub basis. Prices are free with an InfraMap account; pricing node names are part of InfraMap Pro.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- ISONE day-ahead and real-time prices; node and hub assignments as of 2026-10-05
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page