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For the cost of installed solar power, size matters. For residential and commercial systems smaller than 10 kilowatts (kW), the installed cost was $6.10 per watt in 2011. For commercial systems of 100 or more kW, the cost was only $4.90 per watt.
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.