The scrubbers will reduce sulfur dioxide emissions from the plant's nine boilers, which can create sulfates that affect air quality.

Kingston was one of four coal-fired plants in Tennessee and Alabama involved in a federal lawsuit brought by North Carolina over air quality.

TVA said Friday that five of its 11 coal-fired power plants have scrubbers installed. The first scrubber at Kingston was completed in December and the second was completed in April for a total cost of $475 million.

TVA is the nation's largest public utility, supplying electricity to about 8.7 million consumers in Tennessee and parts of Alabama, Mississippi, Georgia, Kentucky, North Carolina and Virginia.

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