Rainbow (CT)
Hydro power plant in Hartford County, Connecticut. 8 MW of nameplate capacity across 2 generators, operated by Farmington River Power Company.
Also known as EIA plant 559
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 8 MWNameplate
- Generators
- 2 operatingEIA-860M, August 2026
- Operating since
- December 1925First generator online
- Operator
- Farmington River Power CompanyEIA operator ID 6207
- Grid
- ISO-NEBalancing authority ISNE
- Price nodes
- 1 ISONE nodeResource nodes with prices
- Location
- Hartford County, CT41.9153, −72.6936
- EIA plant ID
- 559EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Rainbow (CT) produces
Free · EIA-923Net generation, 2025
20.9 GWh
20,905 MWh, final
Capacity factor, 2025
29.8%
2024: 41.8%
January to July 2026
12.9 GWh
Provisional
Range, 2015 to 2025
14.5–38.8
GWh a year. Low 2016, high 2018
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 0 | Not reported | 12 of 12 |
| 2001 | 24,238 | Not reported | 11 of 12 |
| 2002 | 18,363 | Not reported | 12 of 12 |
| 2003 | 42,831 | Not reported | 12 of 12 |
| 2004 | 32,966 | Not reported | 12 of 12 |
| 2005 | 37,905 | Not reported | 12 of 12 |
| 2006 | 42,500 | Not reported | 12 of 12 |
| 2007 | 26,245 | Not reported | 12 of 12 |
| 2008 | 43,128 | Not reported | 12 of 12 |
| 2009 | 39,198 | Not reported | 12 of 12 |
| 2010 | 30,264 | 43.2% | 12 of 12 |
| 2011 | 49,561 | 70.7% | 12 of 12 |
| 2012 | 23,588 | 33.6% | 12 of 12 |
| 2013 | 33,291 | 47.5% | 12 of 12 |
| 2014 | 32,155 | 45.9% | 12 of 12 |
| 2015 | 22,722 | 32.4% | 12 of 12 |
| 2016 | 14,505 | 20.6% | 12 of 12 |
| 2017 | 20,810 | 29.7% | 12 of 12 |
| 2018 | 38,791 | 55.4% | 12 of 12 |
| 2019 | 32,496 | 46.4% | 12 of 12 |
| 2020 | 24,440 | 34.8% | 12 of 12 |
| 2021 | 37,753 | 53.9% | 12 of 12 |
| 2022 | 25,209 | 36.0% | 12 of 12 |
| 2023 | 35,347 | 50.4% | 12 of 12 |
| 2024 | 29,383 | 41.8% | 12 of 12 |
| 2025 | 20,905 | 29.8% | 12 of 12 |
| 2026 (provisional, partial year) | 12,909 | 31.7% | 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 | Conventional Hydroelectric | 4.0 | December 1925 |
| 2 | Conventional Hydroelectric | 4.0 | December 1925 |
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 Farmington River Power Company 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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Questions about Rainbow (CT)
How much power does Rainbow (CT) produce?
Rainbow (CT) reported 20,905 MWh (20.9 GWh) of net generation in 2025, a 29.8% capacity factor on 8 MW of nameplate capacity. From January to July 2026 it reported 12.9 GWh, which is provisional.
Where is Rainbow (CT)?
Rainbow (CT) is in Hartford County, Connecticut, at 41.9153, −72.6936. It is in the ISO New England Inc. balancing area (ISNE).
Who operates Rainbow (CT)?
EIA-860M for August 2026 lists Farmington River Power Company as the operator (EIA operator ID 6207). The operator is not always the owner.
When did Rainbow (CT) start operating?
Its first generator began operating in December 1925, according to EIA-860M.
Does InfraMap have power prices for Rainbow (CT)?
Yes. InfraMap has ISONE day-ahead and real-time prices at 1 price node linked to Rainbow (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
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page