Coal will always be an economical way to generate electric power. There's enough coal to last 200 years. Whether Trump can stop the natural slow decline of the coal industry is one thing. Whether he can prevent the government from deliberately killing it is another. Americans don't benefit when electric rates are increased artificially because perfectly serviceable coal fired power plants have to be retired long before the end of their useful lives. That's just plain stupid, and only imbeciles like you, Lakhota and bulldog would support it.
Coal is not an economical way to general electric power and hasn't been for some time. Natural gas is cheaper and cleaner. In 1990, almost 60% of America's power was produced by coal fired generating plants. It has steadily fallen to 32% and there is no sign of that trend reversing. During the same period power generation by natural gas has risen from 10% to 35%. The low price of clean burning natural gas is the reason for the recent coal to natural gas conversions. The last coal fired power plant in the US went into operation 4 years ago. Power plant construction experts believe it will be America's last coal fired power generation plant to be built.
You are wrong. By every economic measure, coal is the cheapest way of producing power.
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Wood is cheaper, but not as scale-able.
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By any measure you can pick, even including capital costs (price of building the power plant itself, coal is by far cheaper. Only Nuclear and Hydro electric dams, are cheaper.
I'm sorry, but you and your left-wing anti-science people are factually wrong, as you always are.