Good time to invest in coal-fired power plants?
Older coal plants had mostly electro-mechanical control systems that are more survivable of an EMP attack than the newer digital control systems.
The older coal plants can not meet the new EPA emission standards without very expensive upgrades that make them economically impossible to operate. So the electric utilities decommission them.
And before anyone ask; decommissioning means that they have to make changes to the plants that render them impossible to ever operate again.