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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.
Washington area households paid an average of 13.0 cents per kilowatt hour (kWh) of electricity in February 2017, down 3.7 percent compared to the 13.5 cents per kWh in February 2016. The average price of utility (piped) gas at $1.205 per therm in February 2017 was up 25.5 percent from $0.960 per therm a year earlier. At $2.337 a gallon, Washington area consumers paid close to the national average of $2.360 for a gallon of gasoline in February 2017.