A typical house in the United States uses about (10,900 kilowatt-hour) of electricity per year. 1 TWh ( terawatt-hour) = 1x106 GWh (gigawatt-hour) = 1x109 KWh (kilowatt-hour). (c) One recent cost analysis report indicates that electricity from hydroelectric power can be produced for about $0.05 per KWh , while electricity from conventional coal-fired power plants can be produced for an average of about $0.11 per KWh . Calculate the percent change in the cost of electricity for a typical house resulting from a switch between conventional coal-fired power plants to hydroelectric power. Show your work.