Among all old energy sources, the bottom of the list is coal， the price of a ton of standard coal: 550 yuan, about 7 million kcal, is cheaper than the next lowest price of natural gas, which is 3.1 times the coal price. As 1 kcal=1.163 watt-hours, 7 million kcal equals 8141 KWH, which is equivalent to an average price of $1000 for a 4000-6000KW MSE home machine to run for 85 days at least to replace the cost of this one ton standard coal, then it gets cheaper and cheaper further as continue using the machine. Not counting other fees here, there are usually no any other fees at all.
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