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Coal ash is the waste produced by burning coal for energy. In dry form, coal ash or fly ash is the consistency of face powder and is easily swept up by wind. As a result, coal ash is often stored or disposed in water; coal sludge is the mixture of coal ash and water. The coal sludge is thick, gray in color and odorless. Coal refuse is the waste from coal handling and pre-combustion coal preparations.
Bottom ash refers to the non-combustible constituents of coal with traces of combustibles embedded in forming clinkers and sticking to hot side walls of a coal-burning furnace during its operation. Each of these different forms of coal waste is knows to contain toxic materials, including: arsenic, boron, cadmium, cobalt, lead, molybdenum, nitrates and selenium.
Owners: Dayton Power and Light, AEP, Duke Energy (formerly Cincinnati Gas & Electric/Cinergy)
Operated: Dayton Power and Light
Location: Adams County
History of site

Initial year(s) of operation: 1970, 1971, 1972, 197 4

Capacity of plant is 2,440 MW
Disposal information:
The JM Stuart power plant disposes of fly ash in surface impoundments (also known as wet ponds)
Owners: Duke Energy (formerly Cincinnati Gas & Electric/Cinergy), Dayton Power and Light, AEP
Operated: Duke Energy
Location: Clermont County
History of site

Initial year of operation: 1991

Capacity of plant is 1,426 MW
Disposal information:
The Zimmer plant's fly ash and bottom ash are disposed in landfill

Owners: Dayton Power and Light (67%), Duke Energy (33%) (formerly Cincinnati Gas &
Electric/Cinergy)
Operated: Dayton Power and Light
Location: Adams County, Wrightsville, Ohio
History of site

Initial year of operation: 1982

Capacity of plant is 600 MW
Disposal information:
The Killen plant's fly ash and bottom ash are disposed in surface impoundments (also known as wet ponds)
Owners: Duke Energy (formerly Cincinnati Gas & Electric/Cinergy)
Operated: Duke Energy
Location: Hamilton County, North Bend, Ohio
History of site

Initial year(s) of operation: 1949, 1969, 1975, 1978

Capacity of plant is 1,378 MW
Disposal information:
The Miami Fort Generation Station's fly ash and bottom ash are disposed in surface impoundments
(also known as wet ponds)
Owners: Duke Energy (formerly Cincinnati Gas & Electric/Cinergy)
Operated: Duke Energy
Location: Clermont County
History of site

Initial year(s) of operation: 1952, 1953, 1954, 1958, 1962, 1969

Capacity of plant is 1,221 MW
Disposal information:
The Walter Beckjord Generating Station's fly ash is disposed in landfill. The plant's bottom ash is disposed in surface impoundments (also known as wet ponds.)