Basically, the only reason Russia is able to continue their military adventure in Ukraine at all is because the US and NATO currently view directly destroying the Russian military forces there as an escalation that could eventually lead to a nuclear war. If instead Russia takes the first step and directly attacks a NATO country, it would considered a response rather than an escalation if the US/NATO then attacked Russian forces invading Ukraine. Russia knows they have zero chance of prevailing in this scenario, and presumably are smart enough not to invite it.
This seems like the kind of thing you could maybe do once, right as you invade, but not on an ongoing basis.
As far as I know, this is one of the first major armed conflicts where the power grid has been sucha focused target. It's beyond my imagining to think how Ukraine has been coping with this. The article points out how slow & plodding the supply chain is for this kind kf equipment. That's an awful fact of today's economy. America in particular I'd expect to be extra plodding in response.
Major hurricanes slam the south east regularly and damages power infrastructure, regularly. If it became a real problem, the government would be quite real in their response, and so would most of the people