The Tennessee Valley Authority (TVA) has completed an underground retaining wall at the Kingston Fossil Plant where more than one billion gallons of coal ash spilled from a storage pond in December 2008.
The wall is built around the 240-acre containment cell, where recovered ash will be permanently stored.
Construction of the wall began in the summer 2011 and stretches nearly 64,000 linear feet – the equivalent of 12 miles.
In the next phase, the team will work on installing a cap and cover over the cell. That portion of the project remains under budget and is expected to be completed by the end of the year.
TVA also inspected and evaluated all of its coal ash facilities and developed a comprehensive plan to close out wet storage of ash and gypsum, and install new dry storage systems, according to TVA.
The plan was presented to the TVA Board in 2009, and is expected to cost up to $2 billion and be completed by December 2022.
To date, TVA has invested $500 million to complete the process at Kingston.