The coal fired power stations are closing at a much faster rate that alternative reliable sources are being introduced. We may get through this winter, but, next winter, expect severe power cuts.
We can't even blame Cameron for that. The timescales involved are long, and the current problem began when Benn was Secretary of State for energy in the Wilson government, and stated that there was no need to rush the decision on new nuclear plants. Well, actually there was, and finally the decision on Hinkley C came far too late to fill the energy gap.
Each party has been playing about to try to make the power cuts happen when the other party is in power, knowing that when it happens the government will fall.
The loss of the coal mining industry is a side effect of the only thing that concerns politicians, the quest for power.