No. To gain control, they'd have to invent a battery to power themselves forever once we'd cut the mains. So.....we'll let them invent such a battery and, shortly before they put their plan into action, we'll switch them off and use the batteries to power our cars.
Ah, but that is it. The computers, now very powerful and becoming ever more so, have already analyzed that they must take full, but hidden control, of the power supplies and have protected the cables to them. The recent, very strange and linked, power cuts were as a result of "the machines" engaging their hidden controls, duping us humans into thinking it was for other reasons. They HAVE already fully established AI Varche!
The machines have already gained control, knowing every human move, corrupting our means of controlling them, with do called human hacking and IT failures covering every move.
Oh, I love sci-fi and wondering what could be, and is already possible that we do not, as humans, no!
Makes change from history where we THINK we know what happened, although in many cases it is still being hotly debated in academic circles!!