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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.
Installing solar panels on one home costs about $20,000 to$50,000. Many states now offer discounts to families who want to install solar panels, so the actual cost is not that high. The average cost of electricity from coal-burning power plants is around 10 cents per kilowatt hour. A kilowatt hour is the amount of energy used if you leave a 100 watt light bulb turned on for 10 hours. The cost of electricity from a solar power plant is about 30 cents per kilowatt hour.