Hollow Dam Power Partnership
Hydro power plant in St Lawrence County, New York. 0.5 MW of nameplate capacity across 1 generator, operated by Ampersand Hollow Dam Hydro LLC.
Also known as Hollow Dam · EIA plant 10124
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 0.5 MWNameplate
- Generators
- 1 operatingEIA-860M, August 2026
- Operating since
- December 1987First generator online
- Operator
- Ampersand Hollow Dam Hydro LLCEIA operator ID 59136
- Grid
- NYISOBalancing authority NYIS
- Price nodes
- None linkedNo verified ISO node
- Location
- St Lawrence County, NY44.2965, −75.3361
- EIA plant ID
- 10124EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Hollow Dam Power Partnership produces
Free · EIA-923Net generation, 2025
1.03 GWh
1,027 MWh, final
Capacity factor, 2025
11.7%
2024: 18.1%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
1.0–3.3
GWh a year. Low 2025, high 2017
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | Not reported | Not reported | 0 of 12 |
| 2001 | 4,270 | Not reported | 12 of 12 |
| 2002 | 4,449 | Not reported | 12 of 12 |
| 2003 | 4,533 | Not reported | 12 of 12 |
| 2004 | 4,183 | Not reported | 12 of 12 |
| 2005 | 4,511 | Not reported | 12 of 12 |
| 2006 | 4,780 | Not reported | 12 of 12 |
| 2007 | 2,754 | Not reported | 12 of 12 |
| 2008 | 3,392 | Not reported | 12 of 12 |
| 2009 | 3,012 | Not reported | 12 of 12 |
| 2010 | 2,887 | 33.0% | 12 of 12 |
| 2011 | 4,617 | 52.7% | 12 of 12 |
| 2012 | 3,542 | 40.3% | 12 of 12 |
| 2013 | 2,660 | 30.4% | 12 of 12 |
| 2014 | 3,049 | 34.8% | 12 of 12 |
| 2015 | 2,973 | 33.9% | 12 of 12 |
| 2016 | 2,504 | 28.5% | 12 of 12 |
| 2017 | 3,347 | 38.2% | 12 of 12 |
| 2018 | 2,833 | 32.3% | 12 of 12 |
| 2019 | 1,600 | 18.3% | 12 of 12 |
| 2020 | 2,257 | 25.7% | 12 of 12 |
| 2021 | 2,560 | 29.2% | 12 of 12 |
| 2022 | 2,866 | 32.7% | 12 of 12 |
| 2023 | 2,955 | 33.7% | 12 of 12 |
| 2024 | 1,592 | 18.1% | 12 of 12 |
| 2025 | 1,027 | 11.7% | 12 of 12 |
| 2026 (provisional, partial year) | Not reported | Not reported | 0 of 7 |
* 2026 covers January to July and is provisional. Capacity factor is net generation divided by nameplate capacity times the hours of each reported month.
Power prices and basis
Free accountNo verified ISO price node is linked to this plant, or its price history could not load.
Emissions
Free · EPA CAMPDNo EPA emissions units are linked to this plant.
Water use
Free · EIA-923 cooling, USGSNo EIA cooling-water record for this plant in 2024. Plants without steam cooling, such as wind, solar and batteries, do not report cooling water.
Generators
Free · EIA-860M| Generator | Technology | Nameplate MW | Online since |
|---|---|---|---|
| HY2 | Conventional Hydroelectric | 0.5 | December 1987 |
Ownership and offtake
ProOwnership and offtake are part of Pro
Owners and their shares, parent companies, and power purchase agreements with their buyers. EIA-860M lists Ampersand Hollow Dam Hydro LLC as the operator, which is not always the owner.
Modeled data
ProPro adds modeled values for this plant. Everything above stays free.
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Questions about Hollow Dam Power Partnership
How much power does Hollow Dam Power Partnership produce?
Hollow Dam Power Partnership reported 1,027 MWh (1.03 GWh) of net generation in 2025, a 11.7% capacity factor on 0.5 MW of nameplate capacity.
Where is Hollow Dam Power Partnership?
Hollow Dam Power Partnership is in St Lawrence County, New York, at 44.2965, −75.3361. It is in the New York Independent System Operator balancing area (NYIS).
Who operates Hollow Dam Power Partnership?
EIA-860M for August 2026 lists Ampersand Hollow Dam Hydro LLC as the operator (EIA operator ID 59136). The operator is not always the owner.
When did Hollow Dam Power Partnership start operating?
Its first generator began operating in December 1987, according to EIA-860M.
Sources
- EIA-860 2025 (final) and EIA-860M August 2026: plant, generators, capacity, operator and location
- EIA-923 monthly net generation, 2000 to July 2026 (2026 provisional)
- Plant names from OpenStreetMap, © OpenStreetMap contributors (ODbL)
Page updated 2026-10-04 from the InfraMap data build. Methodology · Data sources · EIA plant page