Page 1 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

Duke Energy Coal Plants and Ash Basins

According to the U.S. Energy Information Administration, about 37 percent of all electricity generated in the United States comes from coal. All coal naturally 

contains inorganic matter from the rocks and minerals in the coal seam where it was mined. Coal-fired power plants burn coal to make steam, and the steam 

turns turbines to generate electricity. When that coal is burned, the inorganic matter in the coal becomes coal ash. Coal ash has been accumulating at sites 

throughout the United States for more than nine decades. Duke Energy owns and operates 28 coal plants in six states. 

Different types of coal ash

Coal combustion results in two forms of ash:

 Fly ash — a fine material similar to the consistency of talcum powder. Fly ash accounts for about 78 percent of the coal ash generated annually in the 

United States.

 Bottom ash — a coarser material collected from the bottom of coal-fired boilers.

In addition to fly ash and bottom ash, some power plants also produce synthetic gypsum as a byproduct. This happens at coal-fired plants that have emissionscontrol equipment called scrubbers installed to remove sulfur dioxide emissions.

Storing and managing coal ash

If the ash is not being reused or recycled, it can be stored dry in landfills or in water in ash basins. Duke Energy has already transitioned its larger active coalfired units to store fly ash in dry landfills and has multiple measures in place to safely and effectively manage the ash that is stored in basins.
Page 2 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

North Carolina Ash Basins

Plant Location Plant 

status Current ash management

Number of 

active ash 

basins1

Number of 

semi-active 

ash basins1

Number of 

inactive ash 

basins1

Total 

number of 

ash basins

Size 

(acreage of 

all basins)

Ash inventory 

in basins 

(tons)2

Allen Belmont Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; basin receives 

bottom ash.

1 0 1 2 301 11,580,000

Asheville Asheville Operating

Ash managed in basin and 

directed to a lined fill project 

at airport; developing future 

strategy.

1 0 1 2 78 2,200,000

Belews Creek Belews Creek Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; basin receives 

bottom ash.

1 0 0 1 342 12,610,000

Buck Salisbury Retired Priority for ash basin 

closure. 0 4 0 4 134 6,100,000

Cape Fear Moncure Retired Priority for ash basin 

closure. 0 1 4 5 173 4,460,000

Cliffside Mooresboro Operating

Unit 6 dry fly and bottom 

ash managed in a lined 

landfill; unit 5 directs ash to 

basins.

2 0 1 3 144 6,540,000

Dan River Eden Retired Priority for ash basin 

closure. 0 1 1 2 43 1,170,000

H.F. Lee Goldsboro Retired Priority for ash basin 

closure. 0 1 4 5 314 4,920,000
Page 3 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

Marshall Terrell Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; basin receives 

bottom ash.

1 0 0 1 450 22,270,000

Mayo Roxboro Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; bottom ash 

managed in a lined landfill.

1 0 0 1 144 6,900,000

Riverbend Mount Holly Retired Priority for ash basin 

closure. 0 2 0 2 69 2,730,000

Roxboro Semora Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; basin receives 

bottom ash.

1 0 1 2 495 16,440,000

Sutton Wilmington Retired Priority for ash basin 

closure. 0 1 1 2 135 2,600,000

Weatherspoon Lumberton Retired Priority for ash basin 

closure. 0 0 1 1 55 1,700,000

TOTAL 8 10 15 33 2,876 102,220,000

1. Definitions

 Active ash basin – an ash basin that currently receives coal ash and other permitted water inflows

 Semi-active ash basin – an ash basin that no longer receives coal ash and does receive other permitted water inflows

 Inactive ash basin – an ash basin that no longer receives ash or other permitted water inflows

Duke Energy’s ash basins in North Carolina are regulated by North Carolina Department of Environment and Natural Resources and U.S. Environmental Protection Agency 

under state and federal law. 

2. This number represents ash inventory stored in ash basins. It does not represent all ash stored at a site. 
Page 4 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

South Carolina Ash Basins

Plant Location Plant 

status Current ash management

Number of 

active ash 

basins1

Number of 

semi-active 

ash basins1

Number of 

inactive ash 

basins1

Total 

number of 

ash basins

Size 

(acreage of 

all basins)

Ash inventory 

in basins 

(tons)2

H.B. Robinson Hartsville Retired Priority for ash basin 

closure. 0 0 1 1 55 660,000

W.S. Lee Williamston Operating3

Basins receive fly ash and 

bottom ash. 2 0 1 3 81 1,710,000

TOTAL 2 0 2 4 136 2,370,000

1. Definitions

 Active ash basin – an ash basin that currently receives coal ash and other permitted water inflows

 Semi-active ash basin – an ash basin that no longer receives coal ash and does receive other permitted water inflows

 Inactive ash basin – an ash basin that no longer receives ash or other permitted water inflows

Duke Energy’s ash basins in South Carolina are regulated by South Carolina Department of Health and Environmental Control and U.S. Environmental Protection Agency 

under state and federal law. 

2. This number represents ash inventory stored in ash basins. It does not represent all ash stored at a site. 

3. Units 1 and 2 at W.S. Lee have the potential to be retired by 2015; unit 3 is expected to be converted to natural gas by 2015.
Page 5 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

Indiana Ash Basins

Plant Location Plant 

status Current ash management

Number of 

active ash 

basins1

Number of 

semi-active 

ash basins1

Number of 

inactive ash 

basins1

Total 

number of 

ash basins

Size 

(acreage of 

all basins)

Ash inventory 

in basins 

(tons)2

Cayuga Cayuga Operating

Basins receive fly ash and 

bottom ash. Transitioning 

to dry fly ash managment; 

basins will continue to 

receive bottom ash.

4 0 1 5 227 9,540,000

Edwardsport Edwardsport Operating

Ash was removed from the 

basin prior to synthetic 

liner installation. The lined 

basin continues to be used 

as part of the new IGCC 

plant’s permitted water 

treatment system.

0 0 2 2 9 0

Gallagher New Albany Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; basins 

receive bottom ash.

2 0 2 4 129 5,830,000

Gibson Owensville Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; basins 

receive bottom ash.

4 0 3 7 648 16,990,000

Wabash River Terre Haute Operating3

Basins receive fly ash and 

bottom ash from all units. 

Most fly ash from unit 6 is 

handled dry and 

beneficially reused.

4 0 1 5 200 3,230,000

TOTAL 14 0 9 23 1,212 35,590,000
Page 6 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

1. Definitions

 Active ash basin – an ash basin that currently receives coal ash and other permitted water inflows

 Semi-active ash basin – an ash basin that no longer receives coal ash and does receive other permitted water inflows

 Inactive ash basin – an ash basin that no longer receives ash or other permitted water inflows

The Indiana Department of Environmental Management regulates discharge to surface waterways at Duke Energy’s facilities in Indiana under the authority of the Clean Water 

Act, through an agreement with the U.S. Environmental Protection Agency.

2. This number represents ash inventory stored in ash basins. It does not represent all ash stored at a site. 

3. Units 2 through 5 at Wabash River have the potential to be retired by 2015; unit 6 has the potential to be converted to natural gas or retired by 2016.
Page 7 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

Ohio Ash Basins

Plant Location Plant 

status Current ash management

Number 

of active 

ash 

basins1

Number of 

semi-active 

ash basins1

Number of 

inactive ash 

basins1

Total 

number of 

ash basins

Size 

(acreage of 

all basins)

Ash inventory 

in basins

(tons)2

Beckjord New Richmond

Units 1 –

4, retired; 

units 5, 6 

operating3

Basins receive fly ash and 

bottom ash from units 5 

and 6.

3 0 1 4 167 5,190,000

Miami Fort4 North Bend Operating4

Dry fly ash beneficially 

reused or managed in a 

lined landfill; basins receive 

bottom ash.

2 0 0 2 53 770,0004

Zimmer Moscow Operating

Dry fly ash beneficially 

reused or managed in a 

lined landfill; bottom ash 

managed in a lined landfill.

0 0 0 0 0 0

TOTAL 5 0 1 6 220 5,960,000

1. Definitions

 Active ash basin – an ash basin that currently receives coal ash and other permitted water inflows

 Semi-active ash basin – an ash basin that no longer receives coal ash and does receive other permitted water inflows

 Inactive ash basin – an ash basin that no longer receives ash or other permitted water inflows

Duke Energy’s ash basins in Ohio are regulated by Ohio Department of Natural Resources, Ohio Environmental Protection Agency and U.S. Environmental Protection 

Agency under state and federal law.

2. This number represents ash inventory stored in ash basins. It does not represent all ash stored at a site. 

3. Units 5 and 6 at Beckjord have the potential to be retired by 2015.

4. Unit 6 at Miami Fort serves Duke Energy Kentucky and has the potential to be retired by 2015. The ash inventory number represents ash from all units at Miami Fort, including

unit 6. 
Page 8 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

Kentucky Ash Basins

Plant Location Plant 

status Current ash management

Number 

of active 

ash 

basins1

Number of 

semi-active 

ash basins1

Number of 

inactive ash 

basins1

Total 

number of 

ash basins

Size 

(acreage of 

all basins)

Ash inventory 

in basins

(tons)2

East Bend Union Operating

Dry fly ash managed in a 

lined landfill; basin receives 

bottom ash.

1 0 0 1 53 1,520,000

Miami Fort3

North Bend, 

OH Operating3

Basin receives fly ash and 

bottom ash. N/A3 N/A3 N/A3 N/A3 N/A3 N/A3

TOTAL 1 0 0 1 53 1,520,000

1. Definitions

 Active ash basin – an ash basin that currently receives coal ash and other permitted water inflows

 Semi-active ash basin – an ash basin that no longer receives coal ash and does receive other permitted water inflows

 Inactive ash basin – an ash basin that no longer receives ash or other permitted water inflows

Duke Energy’s ash basins in Kentucky are regulated by Kentucky Department for Environmental Protection and U.S. Environmental Protection Agency under state and 

federal law. Miami Fort is regulated by Ohio state agencies, as it is located in Ohio.

2. This number represents ash inventory stored in ash basins. It does not represent all ash stored at a site. 

3. Unit 6 at Miami Fort serves Duke Energy Kentucky and has the potential to be retired by 2015. For basin statistics, see the Ohio Ash Basins information on page 7.
Page 9 | Updated June 4, 2014 | These figures may be updated as new information becomes available.

Florida Ash Basins

Plant Location Plant 

status Current ash management

Number 

of active 

ash 

basins1

Number of 

semi-active 

ash basins1

Number of 

inactive ash 

basins1

Total 

number of 

ash basins

Size 

(acreage of 

all basins)

Ash inventory 

in basins 

(tons)2

Crystal River Crystal River Operating3

Dry fly ash and bottom ash 

beneficially reused or 

managed in a landfill.

0 1 1 2 41 0

TOTAL 0 1 1 2 41 0

1. Definitions

 Active ash basin – an ash basin that currently receives coal ash and other permitted water inflows

 Semi-active ash basin – an ash basin that no longer receives coal ash and does receive other permitted water inflows

 Inactive ash basin – an ash basin that no longer receives ash or other permitted water inflows

Duke Energy’s ash basins in Florida are regulated by Florida Department of Environmental Protection and U.S. Environmental Protection Agency under state and federal 

law.

2. This number represents ash inventory stored in ash basins. It does not represent all ash stored at a site. 

3. Units 1 and 2 at Crystal River have the potential to be retired in 2018.