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1 ton of coal costs $36 = $0.006 per KWH. 1 barrel of oil costs $70 = $0.05 per KWH. 1 cubic foot of gas $0.008 = $0.03 per KWH. In comparison to solar energy, the hydrocarbon fuel costs are significantly lower without rebates, tax benefits nor the cost of carbon emissions.A twoâKilowatt (KW) solar energy system costs about $45,000 and covers roughly half of a typical American householdâs energy needs.verage 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. Letâs make two calculations to measure the total electric energy output over the lifespan of the solar energy system.
7. How much does geothermal energy cost per kilowatt-hour (kWh)? Answer: At The Geysers, power is sold at $0.03 to $0.035 per kWh. A power plant built today would probably require about $0.05 per kWh. Some plants can charge more during peak demand periods. See also: Buying Clean Electricity. Back to Top. 8.