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Average system costs = $95 per square foot. Average solar panel output = 10.6 watts per square foot. Average solar energy system costs = $8.95 per watt. In order to compare the solar energy costs to conventional hydrocarbon fuels, we must covert the $8.95 per into KWH.
Solar Power Cost Per kWh. A useful figure to use when looking at solar is cost per kWh, as this can be directly compared to your current power bill. A National Renewable Energy Laboratory report spanning 7 U.S states, gives a levelised cost of solar of between $0.28 and $0.46 per kWh for residential solar systems.