Some say it's just some dumb anti 5G boomer or some other stuff, but no, most likely not. A few days ago, some nazi group was going to strike the power grid, and only were stopped because they fucking put it on facebook,

https://www.bloomberg.com/news/articles/2020-12-22/fbi-white-supremacists-plotted-attack-on-us-power-grid?sref=qTppeEL3

That's just too likely to be an actual planned attack imo.