High Dam
High Dam is a 12 MW hydroelectric power plant in Oswego County, New York, operated by Oswego, City of - (NY). EIA-860M lists 4 generating units here, inside NYISO. Its units entered service between 1928 and 1949.
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
- 11.9 MW
- 8.8 MW net summer
- Generating units
- 4
- In service
- 1928–1949
- EIA plant ID
- 2574
Where it is
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- County
- Oswego County, New York
- Coordinates
- 43.4436, -76.4961
- Balancing authority
- NYIS
- Sector
- Electric Utility
Units, technology and status
- Operator of record
- Oswego, City of - (NY)
- Primary energy source
- Hydro
- Technologies
- Conventional Hydroelectric
- Status
- Operating (3) · Out of service but expected to return to service in next calendar year (1)
High Dam: FAQ
- Where is High Dam?
- In Oswego 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 High Dam?
- 12 MW of nameplate capacity across 4 units, as of the EIA-860M release for 2026-07.
- Who owns High Dam?
- EIA-860M names Oswego, City of - (NY) 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 High Dam LLC?
- Probably, but EIA-860M does not say. The survey records a plant name and a reporting entity — Oswego, City of - (NY) 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 "High Dam LLC" usually means this site. This page shows only what EIA files, and does not assert a corporate structure it cannot see.
- Is High Dam still running?
- EIA-860M files it as "Operating" for 2026-07. Statuses change monthly, and this page follows the monthly release.