Coal is a commodity that the Democrats love to hate.
It seems like every week there is a new scheme to get rid of coal and replace it with some sort of liberal based idea that produces needed electricity. For example they proposed renewable energy portfolios and "cap and trade." with tax credits given to those that don't pollute the environment. What they missed in this whole untested scheme was supply.
It's quite simple take away the coal and there will be less supply. Less supply means prices have to come up.
With all their resources at Harvard, Yale and Stanford they still haven't figured this one out.