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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 13.5 cents per kilowatt hour (kWh) of electricity in August 2015, up 3.1 percent from 13.1 cents per kWh in August 2014. The average price of utility (piped) gas at $1.001 per therm in August was down 4.1 percent from $1.044 per therm a year earlier.rices for a gallon of gasoline in Washington have differed from the U.S. average by 5 or less percent in August over the past five years. (See chart 1 and table 1 .). The Consumer Price Index for September 2015 is scheduled to be released on Thursday, October 15, 2015, at 8:30 a.m. (ET).