Rainbow (CT)
Hartford County, Connecticut · EIA plant ID 559 · Operator: Farmington River Power Company
Nameplate8MWSummer 8 MW
Generators2in service
Net generation19GWh12 mo to Aug 2026
Capacity factor28%hydro units, summer MW
Heat rate—thermal plants only
First online1925
The 12-month figures include preliminary EIA-923 months, which EIA revises. Final data runs through Dec 2025.
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 24.2 | 33.7% | — |
| 2002 | 18.4 | 25.6% | — |
| 2003 | 42.8 | 59.6% | — |
| 2004 | 33 | 46.9% | — |
| 2005 | 37.9 | 54.1% | — |
| 2006 | 42.5 | 60.6% | — |
| 2007 | 26.2 | 37.5% | — |
| 2008 | 43.1 | 61.4% | — |
| 2009 | 39.2 | 55.9% | — |
| 2010 | 30.3 | 43.2% | — |
| 2011 | 49.6 | 70.7% | — |
| 2012 | 23.6 | 33.6% | — |
| 2013 | 33.3 | 47.5% | — |
| 2014 | 32.2 | 45.9% | — |
| 2015 | 22.7 | 32.4% | — |
| 2016 | 14.5 | 20.6% | — |
| 2017 | 20.8 | 29.7% | — |
| 2018 | 38.8 | 55.4% | — |
| 2019 | 32.5 | 46.4% | — |
| 2020 | 24.4 | 34.8% | — |
| 2021 | 37.8 | 53.9% | — |
| 2022 | 25.2 | 36.0% | — |
| 2023 | 35.3 | 50.4% | — |
| 2024 | 29.4 | 41.8% | — |
| 2025 | 20.9 | 29.8% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 4 | 4 | Dec 1925 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 4 | 4 | Dec 1925 | Operating | — | coming soon |
Owner / operator
Operator: Farmington River Power Company. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Farmington River Power Company | 100.0% | 8 MW |
Nearby plants
Within 80 km.
| Windsor Locks | — | 1.5 km |
| Bradley Energy Center | 6 MW | 1.6 km |
| CT Airport Authority Solar One | — | 2.8 km |
| Amazon BDL4 | 4 MW | 3.2 km |
| Pepperidge Farm Bloomfield | 3 MW | 5.5 km |
| Algonquin Windsor Locks | 71 MW | 5.7 km |