Having read the above thought out posts, we should be on the lookout for the state insulating itself (hardening). If they are doing this on the sly, there might be reason so suspect that the state is planning to EMP our own systems.
In my humble opinion, it’s more likely they would do a false flag cyber attack… one that could easily be reversed on command to bring the grid back online.
That way, they could leave everyone to fight for themselves, weakening the populace and making it desperate. Then, they come in on the white horse to ‘save the day’ when a quota of damage/population loss has been achieved. Deranged plan? You bet. Beyond these lunatics? Nope. Biggest question then would be how they would keep the necessary troops from desertion, etc.