Ayers Island
Grafton County, New Hampshire · EIA plant ID 2355 · Operator: Central Rivers Power NH, LLC
Nameplate8MWSummer 8 MW
Generators3in service
Net generation36GWh12 mo to Dec 2025
Capacity factor49%hydro units, summer MW
Heat rate—thermal plants only
First online1925
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 | 26.9 | 34.1% | — |
| 2002 | 34 | 43.1% | — |
| 2003 | 45.9 | 58.2% | — |
| 2004 | 38.4 | 48.5% | — |
| 2005 | 50.1 | 63.6% | — |
| 2006 | 53.1 | 67.3% | — |
| 2007 | 40.5 | 51.4% | — |
| 2008 | 51.4 | 65.1% | — |
| 2009 | 51.4 | 65.2% | — |
| 2010 | 44.9 | 64.9% | — |
| 2011 | 49.8 | 67.7% | — |
| 2012 | 45.9 | 62.2% | — |
| 2013 | 46.7 | 63.5% | — |
| 2014 | 43.7 | 59.4% | — |
| 2015 | 37.8 | 51.4% | — |
| 2016 | 37.2 | 50.5% | — |
| 2017 | 44.6 | 60.6% | — |
| 2018 | 48.2 | 65.5% | — |
| 2019 | 49.6 | 67.3% | — |
| 2020 | 40.5 | 54.8% | — |
| 2021 | 41.7 | 56.6% | — |
| 2022 | 41.4 | 56.2% | — |
| 2023 | 54.4 | 74.0% | — |
| 2024 | 40.1 | 54.3% | — |
| 2025 | 36.3 | 49.3% | — |
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 |
|---|---|---|---|---|---|---|---|---|
| 1 | Conventional Hydroelectric | HY | 2.8 | 2.8 | Aug 1925 | Operating | — | coming soon |
| 2 | Conventional Hydroelectric | HY | 2.8 | 2.8 | Aug 1925 | Operating | — | coming soon |
| 3 | Conventional Hydroelectric | HY | 2.8 | 2.8 | Aug 1925 | Operating | — | coming soon |
Owner / operator
Operator: Central Rivers Power NH, LLC. Ownership shares by in-service nameplate MW (EIA-860 Schedule 4; units not listed there are wholly owned by the operator).
| Central Rivers Power NH, LLC | 100.0% | 8 MW |
Nearby plants
Within 80 km.
| Newfound Hydroelectric | 1 MW | 1.5 km |
| Indeck Energy-Alexandria | retired | 6.5 km |
| Bridgewater Power LP | 20 MW | 13.9 km |
| Eastman Falls | 6 MW | 17.4 km |
| Stevens Mills Dam | 2 MW | 17.9 km |
| Plymouth State College Cogeneration | 3 MW | 18.7 km |