Derby Hydro
Derby Hydro is a 9 MW hydroelectric power plant in Fairfield County, Connecticut, operated by McCallum Enterprises I LP. EIA-860M lists 4 generating units here, inside ISO New England. Its units entered service in 1989.
As of 2026-07 (inventory dated 2026-07-31) · EIA-860M Preliminary Monthly Electric Generator Inventory · eia.gov/…/july_generator2026.xlsx · eia.gov/…/eia860m
- Nameplate capacity
- 8.6 MW
- 8.6 MW net summer
- Generating units
- 4
- In service
- 1989
- EIA plant ID
- 10063
Where it is
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- County
- Fairfield County, Connecticut
- Coordinates
- 41.3243, -73.1021
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- McCallum Enterprises I LP
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating (2) · Standby/Backup (2)
Derby Hydro: FAQ
- Where is Derby Hydro?
- In Fairfield County, Connecticut (CT). The map on this page is placed at the coordinates EIA files for the plant, which locate the site rather than any individual unit.
- How big is Derby Hydro?
- 9 MW of nameplate capacity across 4 units, as of the EIA-860M release for 2026-07.
- Who owns Derby Hydro?
- EIA-860M names McCallum Enterprises I LP as the reporting entity. That is the operator of record on the survey, which is not always the ultimate owner.
- Is this the same as Derby Hydro LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — McCallum Enterprises I LP here — not the project company that holds the asset. Project companies are commonly registered as an LLC carrying the plant's name, so a search for "Derby Hydro LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Derby Hydro still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.