Mountain Island
Hydro power plant in Gaston County, North Carolina. 60 MW of nameplate capacity across 4 generators, operated by Duke Energy Carolinas, LLC.
Also known as Mountain Island Dam · EIA plant 2728
Analyst: free account, 1 question a day.
Key facts
- Capacity
- 60 MWNameplate
- Generators
- 4 operatingEIA-860M, August 2026
- Operating since
- December 1923First generator online
- Operator
- Duke Energy Carolinas, LLCEIA operator ID 5416
- Grid
- DUKBalancing authority DUK
- Price nodes
- None linkedNo verified ISO node
- Location
- Gaston County, NC35.3339, −80.9867
- EIA plant ID
- 2728EIA plant page
Data as of EIA-860M August 2026 (published 2026-09-24). Capacity is nameplate, not live output.
How much power Mountain Island produces
Free · EIA-923Net generation, 2025
90.0 GWh
89,991 MWh, final
Capacity factor, 2025
17.1%
2024: 24.9%
January to July 2026
Not reported
Provisional. 0 of 7 months reported
Range, 2015 to 2025
90.0–227.6
GWh a year. Low 2025, high 2020
| Year | Net generation, MWh | Capacity factor | Months reported |
|---|---|---|---|
| 2000 | 49,797 | Not reported | 12 of 12 |
| 2001 | 35,293 | Not reported | 12 of 12 |
| 2002 | 39,989 | Not reported | 12 of 12 |
| 2003 | 179,701 | Not reported | 12 of 12 |
| 2004 | 123,772 | Not reported | 12 of 12 |
| 2005 | 126,974 | Not reported | 12 of 12 |
| 2006 | 81,196 | Not reported | 12 of 12 |
| 2007 | 69,262 | Not reported | 12 of 12 |
| 2008 | 43,777 | Not reported | 12 of 12 |
| 2009 | 115,325 | Not reported | 12 of 12 |
| 2010 | 112,499 | 21.4% | 12 of 12 |
| 2011 | 72,461 | 13.8% | 12 of 12 |
| 2012 | 71,839 | 13.6% | 12 of 12 |
| 2013 | 173,669 | 33.0% | 12 of 12 |
| 2014 | 108,212 | 20.6% | 12 of 12 |
| 2015 | 110,891 | 21.1% | 12 of 12 |
| 2016 | 101,821 | 19.3% | 12 of 12 |
| 2017 | 90,428 | 17.2% | 12 of 12 |
| 2018 | 207,502 | 39.5% | 12 of 12 |
| 2019 | 177,950 | 33.9% | 12 of 12 |
| 2020 | 227,649 | 43.2% | 12 of 12 |
| 2021 | 127,152 | 24.2% | 12 of 12 |
| 2022 | 103,670 | 19.7% | 12 of 12 |
| 2023 | 99,571 | Not reported | 12 of 12 |
| 2024 | 131,148 | 24.9% | 12 of 12 |
| 2025 | 89,991 | 17.1% | 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 |
|---|---|---|---|
| 1 | Conventional Hydroelectric | 15.0 | December 1923 |
| 2 | Conventional Hydroelectric | 15.0 | December 1923 |
| 3 | Conventional Hydroelectric | 15.0 | December 1923 |
| 4 | Conventional Hydroelectric | 15.0 | December 1923 |
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 Duke Energy Carolinas, 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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Power plants near Mountain Island
More plants operated by Duke Energy Carolinas, LLC
Questions about Mountain Island
How much power does Mountain Island produce?
Mountain Island reported 89,991 MWh (90.0 GWh) of net generation in 2025, a 17.1% capacity factor on 60 MW of nameplate capacity.
Where is Mountain Island?
Mountain Island is in Gaston County, North Carolina, at 35.3339, −80.9867. It is in the Duke Energy Carolinas balancing area (DUK).
Who operates Mountain Island?
EIA-860M for August 2026 lists Duke Energy Carolinas, LLC as the operator (EIA operator ID 5416). The operator is not always the owner.
When did Mountain Island start operating?
Its first generator began operating in December 1923, 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