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Key Topic

Coal Combustion Products

TVA is phasing out wet storage of ash and gypsum at its coal-fired power plants and installing state-of-the-art dry storage systems.

The transition from wet to dry storage will make TVA an industry leader in managing coal combustion products.

Background

Following the ash spill at Kingston Fossil Plant in December 2008, TVA has developed a comprehensive plan for managing coal combustion products so no similar event ever occurs again at a TVA site.

Important points

  • After the Kingston spill, TVA commissioned Stantec Consulting to inspect, evaluate and recommend improvements for combustion product management at all 11 TVA fossil plants.
  • In August 2009, the TVA Board of Directors approved a plan to end wet storage of coal ash and gypsum with a goal of making TVA’s storage facilities the safest, most modern, and most thoroughly inspected in the industry.
  • TVA plans to convert all wet ash and gypsum storage to dry storage, and to eliminate any storage impoundment’s federally classified high-risk potential to people and property if the impoundment failed.
  • The plan, subject to environmental reviews and regulatory approvals, calls for building ash and gypsum dewatering facilities, permitting and constructing new dry storage landfills and closing existing ash and gypsum ponds.
  • The plan is expected to cost $1.5 billion to $2 billion over an eight- to 10-year period.

Other information

  • All 11 TVA coal-burning plants now use wet bottom-ash systems, and these will be converted to dry systems.
  • The six TVA coal-burning plants that use wet fly-ash handling systems are: Allen, Gallatin, Johnsonville and Kingston in Tennessee; Widows Creek in Alabama, and Paradise in Kentucky.
  • The first conversion to dry fly-ash storage will be at Kingston Fossil Plant. It should be complete in late 2011.
  • In the last decade, TVA has beneficially reused more than 29 million tons of coal combustion products. TVA is evaluating a number of market, economic and regulatory issues that will provide the basis for identifying and setting specific targets for increasing the diversion of these materials.

July 2010

 

 

           
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