If you assume there's a Machiavelli in play, first was a glowie, the rest are up in the air. There was an unusually high level of attention and politicization over the first one, despite the total lack of evidence for a political motive, which did more to cement the idea of power infrastructure attacks as a viable method of disruption than any dissident has managed in decades. It would certainly make it easier for normies to swallow another couple steps towards totalitarianism if regular power grid disruption was on the table.