Mountain Island

439 Mountain Island Rd, Mount Holly, NC 28120

Plant Summary Information

Mountain Island is ranked #16 out of 33 hydroelectric power plants in North Carolina in terms of total annual net electricity generation.

Mountain Island is comprised of 4 generators and generated 13.5 GWh during the 3-month period between September 2025 to December 2025.

Plant Name	Mountain Island
Utility Name	Duke Energy Carolinas, LLC
Location	Gaston County, NC
Initial Operation Date	December 1923
Last Update	Dec 2025
Annual Generation	90.0 GWh
Annual Consumption	341.2 k MMBtu
Ranked #3,624 out of 13,081 Power Plants Nationwide
Ranked #348 out of 1,311 Water Power Plants Nationwide
Ranked #86 out of 876 North Carolina Power Plants
Ranked #16 out of 33 North Carolina Water Power Plants
Fuel Types	Water

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Summary Information
Plant Name	Mountain Island (2728)
Plant Address	439 Mountain Island Rd, Mount Holly, NC 28120
Utility	Duke Energy Carolinas, LLC (5416)
Latitude, Longitude	35.3339, -80.9867
Generation Dates on File	Jan 2001 to Dec 2025
Initial Operation Date	December 1923
Annual Generation	90.0 GWh
Fuel Types	Water

Federal Energy Regulatory Commission (FERC) Information
FERC Cogeneration Status	No
FERC Small Power Producer Status	No
FERC Exempt Wholesale Generator Status	No

Regulatory Information
Regulatory Status	Regulated
NERC Region	SERC
Balancing Authority	Duke Energy Carolinas (DUK)
NAICS Code	Utilities (22)
Sector	Electric Utility (1)
Water Source	Catawba River
Ash Impoundment	No
Transmission / Distribution Owner	Duke Energy Carolinas, LLC (5416) NC
Grid Voltage	44.00 kV
Energy Storage	No

* Data obtained from the 2025 EIA 860 Report

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	15 MW
Nameplate Power Factor	0.8
Summer Capacity	17 MW
Winter Capacity	17 MW
Minimum Load	14 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	December 1923
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	15 MW
Nameplate Power Factor	0.8
Summer Capacity	17 MW
Winter Capacity	17 MW
Minimum Load	14 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	December 1923
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	15 MW
Nameplate Power Factor	0.8
Summer Capacity	17 MW
Winter Capacity	17 MW
Minimum Load	17 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	December 1923
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Technology	Conventional Hydroelectric
Prime Mover	Hydroelectric Turbine
Ownership	Single Owner
Nameplate Capacity	15 MW
Nameplate Power Factor	0.8
Summer Capacity	17 MW
Winter Capacity	17 MW
Minimum Load	17 MW
Uprate/Derate Completed	No

Status	Operating
First Operation Date	December 1923
Combined Heat & Power	No
Sector Name	Electric Utility (1)
Energy Source	Water
Solid Fuel Gasification	No
Carbon Capture Technology	No
Time From Cold Shutdown To Full Load	10M
Multiple Fuels	No

Owner Name	Address	Generator	Ownership
*We couldn't locate any owners for this plant*

Power plants with a similar annual net generation from Water.

Rank	Plant Name	Plant Location	Annual Generation
#338	Lake Lynn Hydro Station	Lake Lynn, PA	93.9 GWh
#339	Falls Hydro	Badin, NC	93.6 GWh
#340	Shepaug	Southbury, CT	93.3 GWh
#341	Winfield	Winfield, WV	93.0 GWh
#342	Horse Mesa	Apache Junction, AZ	92.6 GWh
#343	Upper Salmon A	Hagerman, ID	92.6 GWh
#344	Shoshone (CO)	Glenwood Springs, CO	91.8 GWh
#345	Saluda Lexington	Columbia, SC	91.5 GWh
#346	Bennetts Bridge	Altmar, NY	90.4 GWh
#347	Stewarts Bridge	Corinth, NY	90.4 GWh
#349	Muck Valley Hydroelectric	NA, CA	89.8 GWh
#350	Union Valley	Fresh Pond, CA	89.1 GWh
#351	Upper Salmon B	Hagerman, ID	89.1 GWh
#352	Laurel Dam	London, KY	88.8 GWh
#353	Navajo Dam	Farmington, NM	88.3 GWh
#354	Goat Rock	Smiths, AL	88.1 GWh
#355	Smith (NH)	Berlin, NH	87.5 GWh
#356	Monroe Street	Spokane, WA	87.5 GWh
#357	Smith Falls Hydro Project	Bonners Ferry, ID	87.2 GWh
#358	Degray	Arkadelphia, AR	86.8 GWh

Below are closest 20 power plants surrounding Mountain Island.

Plant Name	Plant Location	Annual Generation	Distance
Auten Road Farm, LLC	Gastonia, NC	9.3 GWh	8.7 mi
Cowans Ford	Stanley, NC	124.9 GWh	7.1 mi
DE Solar 1725 Drywall Dr	Mt. Holly, NC	1.2 GWh	0.8 mi
Freemont Solar Center LLC	Stanley, NC	8.3 GWh	6.5 mi
G G Allen	Belmont, NC	197.9 GWh	10.1 mi
Gaston County Renewable Energy Center	Dallas, NC	23.1 GWh	11 mi
Gaston Memorial Hospital	Gastonia, NC	22.0 MWh	9.5 mi
Gaston Solar Power Plant	Cherryville Township, NC	45.8 GWh	8.4 mi
Gastonia Prime Power Park	Dallas, NC	86.0 MWh	12.7 mi
Gastonia Solar Center	Gastonia, NC	8.1 GWh	13.5 mi
Gastonia, Tulip Drive	Gastonia, NC	136.0 MWh	12.7 mi
High Shoals Hydro (NC)	High Shoals, NC	3.0 GWh	12.8 mi
High Shoals PV1	High Shoals, NC	30.7 GWh	13.8 mi
Huntersville Delivery No 2	Huntersville, NC	1.0 MWh	9.3 mi
Lincoln Combustion	Stanley, NC	981.9 GWh	7.3 mi
Long Creek Waste Water Plant	Dallas, NC	407.0 MWh	8.9 mi
Mariposa Solar Center LLC	Stanley, NC	8.5 GWh	6.3 mi
McGuire	Huntersville, NC	19.0 TWh	7.2 mi
Orbit Energy Charlotte	Charlotte, NC	199.9 MWh	11 mi
Reventure Park	Charlotte, NC	26.7 GWh	2.8 mi