The Electric Bill Is Going Up Again In April. The Tennessee Valley Authority Has Announced An Increase In Its Fuel Adjustment Charge. The Utility Said The Hike Will Raise Residential Power Bills Between $3 And $6.50 Per Month, Depending On How Much Electricity Is Used. TVA Uses Fossil Fuels – Coal, Oil And Natural Gas – To Generate About Half Of Its Electricity. When Those Costs Rise, TVA’s Costs Increase. The Other Half Of TVA Electricity Comes From Its Nuclear Plants And Hydroelectric Generation.