Kentucky Dam, the largest dam in the Tennessee Valley Authority river system, recently celebrated 80 years of providing clean, reliable energy to the Tennessee Valley region. Called ” TVA’s Mightiest Dam” at its Summer 1944 opening with President Harry Truman in attendance, Kentucky Dam is 206 feet high and 8,422 feet long. The hydroelectric plant has five operating units that can produce approximately 225 megawatts-enough to power about 220,000 homes.