The book Sandworm by Andy Greenberg also goes a little into depth about attacking powerplants and other industrial control systems. Can highly recommend!
Sounds fun, but please not in my neighbourhood ..
So better stay a couple countries away from me with experiments. Or maybe don't, better a benevolent chaos monkey than being hit unprepared by your enemy.
But the whole grid needs a rework. Also because of renewables and batteries etc. To better react do changing demand and enable a free market, where it is easy to buy and sell power.
[1] [PDF] https://www.wired.com/images_blogs/threatlevel/2010/11/w32_s...