"each man was assigned to attacking power grids in different parts of the country with powerful rifles"

I presume if you could puncture a transformer or switchgear casing, the insulating oil would drain and that section would shut down. You might be able to damage some of the line insulators. It would be hard to do any lasting damage unless you can damage one of the transformers

"Throughout the spring of 2020, the trio met with each other and potential juvenile recruits to discuss the plot. "

That's just shows how retarded they were, if someone has an idea then maybe they should just go and do it, if anyone else thinks its viable then they might copy it. You don't ponce around on Twitter and look for e-peen validation from other autists.

No mention on how they were caught.