For example, the average annual electricity consumption of a U.S. residential customer was 10,908 kilowatthours (kWh) in 2013, according to the U.S. Energy Information Administration. To generate that 10.9 kWh of electricity, a house in southern New England would need a system roughly 7 kW to 10.5 kW at a cost of approximately $26,000 to $39,000 (or $0, see below). Many solar cost estimators, such as Solar-Estimate are available online to help you get a sense of what your particular solar costs might be; an estimate by a reputable solar installation company is an even better way to find out your costs and electricity production capability.