Huge electricity draws mean electric companies have to beef up things, but when the AI centers suddenly stop using the massive draw (my understanding is they have their own generators) on the lines it makes huge problems for the electric companies lines downstream. Power lines were not designed to take huge loads of unused electricity. Home Solar at least had a system where it would not except excess power when not needed (thus it made it sometimes unprofitable to resale power to electric companies when the sun was full blazing). Right now big Data Centers don't really have a safety switch... It is on or off, and being massive draws on power can cause a lot of headaches.
My two cents.