NASHVILLE, Tenn. (AP) — The state of Tennessee's lawsuit over claims of coal ash pollution at a power plant run by the nation's largest public utility is now in federal court. The move from Davidson County Chancery Court comes after a federal judge earlier this month ordered a coal ash cleanup at Tennessee Valley Authority's Gallatin Fossil Plant. Judge Waverly Crenshaw ordered TVA to excavate and move Gallatin's coal ash so it risks no further pollution of the Cumberland River.