The Tennessee Valley Authority (TVA) is a federally-owned electric utility corporation in the U.S. TVA’s service area covers all of Tennessee, portions of Alabama, Mississippi, and Kentucky, and small areas of Georgia, North Carolina, and Virginia. TVA is the sixth-largest power supplier and the largest public utility in the country. We have some GREAT news: TVA is spending over $1 billion to replace six coal-fired plants with natgas-fired turbines.