Derby Hydro
Hydro power plant · Fairfield County, Connecticut
Details
- Primary fuel
- Hydro
- Technology
- Conventional Hydroelectric
- Operator
- McCallum Enterprises I LP
- County
- Fairfield County
- Generating units
- 4
- Share of state capacity
- 0.08%
- Rank among hydro plants in Connecticut
- #5 of 14
- EIA plant code
- 10063
Generating units
| Unit | Technology | Nameplate | Summer | Online | Status |
|---|---|---|---|---|---|
| GEN1 | Conventional Hydroelectric | 4.0 MW | 4.0 MW | 1989 | Operating |
| GEN2 | Conventional Hydroelectric | 4.0 MW | 4.0 MW | 1989 | Operating |
| GEN3 | Conventional Hydroelectric | 0.3 MW | 0.3 MW | 1989 | Standby/Backup: available for service but not normally used |
| GEN4 | Conventional Hydroelectric | 0.3 MW | 0.3 MW | 1989 | Standby/Backup: available for service but not normally used |
Nameplate is the maximum rated output; summer capacity is what the unit can reliably deliver on a hot day, which is typically lower.
Similarly sized plants in Connecticut
| Sikorsky Aircraft CHP | Natural gas | 9.9 MW |
| Falls Village | Hydro | 9.0 MW |
| Rainbow (CT) | Hydro | 8.0 MW |
| Naval Sub Base New London Fuel Cell | Natural gas | 7.4 MW |
About this data
From EIA’s inventory of operable generators, May 2026 release. Capacity is nameplate — the maximum rated output of the equipment, not what the plant actually generates over a year, which depends on how often it runs. A 8.6 MW solar plant and a 8.6 MW nuclear plant have the same entry here and produce very different amounts of electricity.
“In service since” is the earliest in-service date among the units still listed, so a site rebuilt around newer equipment can read as younger than the site itself. All Connecticut power plants · What Connecticut actually generates