The federal agency is continuing to move forward on the five-year construction effort at the plant near Gallitan, Tennessee, that would reduce mercury, nitrogen oxide and sulphur dioxide emissions.
The project comes after the federal agency agreed to resolve long-standing disputes over the pollution emitted by its plants.
TVA entered into an agreement with the US Environmental Protection Agency, four states and three environmental groups, including the Sierra Club, to lower its emissions and meet new requirements of the federal Clean Air Act.
TVA is installing four scrubbers to cut sulphur dioxide emissions and another system designed to cut nitrogen oxide levels.
The Gallatin plant burns 13,000 tons of coal a day and produces enough electricity to power the equivalent of 300,000 homes.
The authority is also building a 54-acre landfill to safely store the coal ash waste produced by the plant.
The progress of work is currently at 30% and is due for completion in 2017.
