Shepaug
Shepaug is a 37 MW hydroelectric power plant in New Haven County, Connecticut, operated by FirstLight Power Resources Services LLC. EIA-860M lists 1 generating unit here, inside ISO New England. Its unit entered service in 1955.
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
- 37.2 MW
- 41.5 MW net summer
- Generating units
- 1
- In service
- 1955
- EIA plant ID
- 552
Where it is
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- County
- New Haven County, Connecticut
- Coordinates
- 41.4484, -73.2953
- Balancing authority
- ISNE
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- FirstLight Power Resources Services LLC
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating
Every plant FirstLight Power Resources Services LLC reports to EIA →
Shepaug: FAQ
- Where is Shepaug?
- In New Haven 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 Shepaug?
- 37 MW of nameplate capacity across 1 unit, as of the EIA-860M release for 2026-07.
- Who owns Shepaug?
- EIA-860M names FirstLight Power Resources Services LLC 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 Shepaug LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — FirstLight Power Resources Services LLC 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 "Shepaug LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Shepaug still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.