Because we’re running out of water:
LAKE NORMAN, N.C. - Nuclear reactors across the Southeast could be forced to throttle back or temporarily shut down later this year because drought is drying up the rivers and lakes that supply power plants with the amounts of cooling water they need to operate.

awesome. I hate nukes.
One of the lesser remarked phenomenon of global warming is that as the temperature heats up, more water evaporates and stays in the atmosphere as gas. So the amount of water in its liquid state actually shrinks. That’s just basic physics, and something the C students from Yale just don’t seem to grasp.
Duh gee Tennessee, no one could have foreseen THAT!
They’re having the same problem in France, especially in summer.