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60 MW Hydro operating in Gaston, NC — Duke Energy Carolinas
60 MW
Nameplate Capacity
4
Generators
units
Conventional Hydroelectric
Technology
1923
Operating Since
Coordinates
35.3339, -80.9867
County
Gaston, NC
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Duke Energy Carolinas, LLC | Duke Energy Carolinas | — |
| Owner(s) | Duke Energy Carolinas, LLC | Duke Energy | — |
| Status | Operating | operating | — |
Mountain Island is a 60 MW hydroelectric power plant located in Gaston County, North Carolina. The plant, which began operating in 1923, utilizes conventional hydroelectric technology and consists of 4 generators. It is owned and operated by Duke Energy Carolinas, LLC, a subsidiary of Duke Energy. The plant's primary fuel source is water (WAT). Mountain Island operates within the Duke Energy Carolinas balancing authority and the SERC NERC region.
In the most recent year with available data, Mountain Island generated 131,148 MWh of electricity, resulting in a capacity factor of 24.8%. The plant's installed cost was $657.75 per kW, and it has a power purchase agreement (PPA) price of $25 per MWh. Mountain Island is ranked as the 11th largest power plant out of 39 in North Carolina, and 270th out of 1464 nationally.
Generated from EIA, GEM, and public data sources
Grid Region
Southeast
Market
SEEM Participant
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
10.0K MWh
Latest Month
131.1K MWh
Annual Generation
24.8%
Capacity Factor
Duke Energy Carolinas, LLC · Data from 2015–2025
$25.0/MWh
PPA Price
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
This plant's balancing authority participates in the Southeast Energy Exchange Market (SEEM). SEEM is a bilateral exchange — no public nodal pricing.
Last updated 2026-03-26
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ask pi about Mountain IslandDuke Energy Carolinas (DUK)
Grid Voltage
44.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility