Hollow Dam Power Partnership
Hollow Dam Power Partnership is a 1 MW hydroelectric power plant in St Lawrence County, New York, operated by Ampersand Hollow Dam Hydro LLC. EIA-860M lists 2 generating units here, inside NYISO. Its units entered service in 1987.
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
- 1 MW
- 0.6 MW net summer
- Generating units
- 2
- In service
- 1987
- EIA plant ID
- 10124
Where it is
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- County
- St Lawrence County, New York
- Coordinates
- 44.2965, -75.3361
- Balancing authority
- NYIS
- Sector
- IPP Non-CHP
Units, technology and status
- Operator of record
- Ampersand Hollow Dam Hydro LLC
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Out of service and NOT expected to return to service in next calendar year (1) · Operating (1)
Hollow Dam Power Partnership: FAQ
- Where is Hollow Dam Power Partnership?
- In St Lawrence County, New York (NY). 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 Hollow Dam Power Partnership?
- 1 MW of nameplate capacity across 2 units, as of the EIA-860M release for 2026-07.
- Who owns Hollow Dam Power Partnership?
- EIA-860M names Ampersand Hollow Dam Hydro 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 Hollow Dam Power Partnership LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Ampersand Hollow Dam Hydro 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 "Hollow Dam Power Partnership LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is Hollow Dam Power Partnership still running?
- EIA-860M files it as "Out of service and NOT expected to return to service in next calendar year" for 2026-07. Statuses change monthly, and this page follows the monthly release.