Hollow Dam Power Partnership
St. Lawrence County, New York · EIA plant ID 10124 · Operator: Ampersand Hollow Dam Hydro LLC
Nameplate1MWSummer 1 MW
Generators2in service
Net generation1GWh12 mo to Dec 2025
Capacity factor20%hydro units, summer MW
Heat rate—thermal plants only
First online1987
Monthly net generation
EIA-923, all units at the plant. Net of station use; storage can go negative.
FinalPreliminary
Capacity factor by year
Net MWh ÷ (summer MW × hours), hydro units. Each year uses that year's EIA-860 ratings; the hollow dot is the latest 12 months.
Heat rate by year
Electric fuel MMBtu × 1000 ÷ net MWh (Btu/kWh, HHV), fossil units only; CT + CA counted as one combined-cycle block.
Heat rate applies to fuel-burning (thermal) units only.
Annual data table
| Year | Net GWh | Capacity factor | Heat rate (Btu/kWh) |
|---|---|---|---|
| 2001 | 4.3 | 48.7% | — |
| 2002 | 4.4 | 50.8% | — |
| 2003 | 4.5 | 34.5% | — |
| 2004 | 4.2 | 48.6% | — |
| 2005 | 4.5 | 57.2% | — |
| 2006 | 4.8 | 113.7% | — |
| 2007 | 2.8 | 157.2% | — |
| 2008 | 3.4 | 96.5% | — |
| 2009 | 3 | 86.0% | — |
| 2010 | 2.9 | 164.8% | — |
| 2011 | 4.6 | 87.8% | — |
| 2012 | 3.5 | 67.2% | — |
| 2013 | 2.7 | 50.6% | — |
| 2014 | 3 | 58.0% | — |
| 2015 | 3 | 56.6% | — |
| 2016 | 2.5 | 47.5% | — |
| 2017 | 3.3 | 63.7% | — |
| 2018 | 2.8 | 53.9% | — |
| 2019 | 1.6 | 30.4% | — |
| 2020 | 2.3 | 42.8% | — |
| 2021 | 2.6 | 48.7% | — |
| 2022 | 2.9 | 54.5% | — |
| 2023 | 3 | 56.2% | — |
| 2024 | 1.6 | 30.2% | — |
| 2025 | 1 | 19.5% | — |
Generators
EIA-860 (annual) with EIA-860M updates through Sep 2026. EIA-923 reports generation by plant, prime mover and fuel, not by unit, so unit-level output isn't shown.
| Gen ID | Technology | Prime mover | Nameplate MW | Summer MW | Online | Status | Planned retirement | OEM / model |
|---|---|---|---|---|---|---|---|---|
| HY1 | Conventional Hydroelectric | HY | 0.5 | 0.3 | Dec 1987 | Operating (Out of service) | — | coming soon |
| HY2 | Conventional Hydroelectric | HY | 0.5 | 0.3 | Dec 1987 | Operating | — | coming soon |
Owner / operator
Operator: Ampersand Hollow Dam Hydro LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Ampersand Hollow Dam Hydro LLC | 100.0% | 1 MW |
Nearby plants
Within 80 km.
| Hampshire Paper | 3 MW | 2.4 km |
| Talcville | 1 MW | 2.6 km |
| Hailesboro 4 Plant | 1 MW | 8.8 km |
| ASA Gouverneur NY Solar II LLC | 4 MW | 10.1 km |
| Oswegatchie | 2 MW | 11.3 km |
| South Edwards | 4 MW | 11.6 km |