OK… I don’t KNOW, but it seems to me to be fairly clear that the army are not being sent in to do maintenance.
Eskom seems to have started keeping shtum again, but for a while they were very communicative and quite a lot of information was released. It seems clear to me that there is not a single front on which Eskom must fight. They have many parties seeking to exploit them.
One of the reports that emerged was a guy delivering diesel. He went in the usual entrance and his tanker was weighed. He would then exit at the same point, as per procedure, and his tanker was weighed again. The difference in weight determined how much he was paid for the delivery.
But he wasn’t driving in, filling up the tank at the station and then driving out again. There was a hole in the fence, though which he drove. He would then fill tanks on a neighbouring farm. Then he’d reverse his journey. So Eskom paid for diesel they never received, the tanks on the farm got filled for free (to the farm), and I’m sure the driver was getting a nice little cut of the action.
So a bit of keeping an eye on perimeters would have paid off there.
It is clear that Eskom is under siege, but it’s not a single, unified, coordinated siege. The plunderers are many. Some are people that Eskom thought they could trust. Some are on the inside, but a lot are on the outside. EG a contractor who was called in to do a repair, did the repair, but also drilled a hole in a bearing casing knowing that the bearing would run dry and he’d be called back to do another repair.
That’s much harder for the military to detect, though Eskom picked it up after increasing their own security measures. My point is that Eskom is under attack on many fronts and it’s not one, coordinated campaign.
The initial announcement, that you quoted, actually explains quite a lot. See
https://www.businesslive.co.za/bloomberg/news/2022-12-17-army-guards-four-eskom-power-stations/
There is theft and vandalism going on at the stations at which the military were first deployed. Now this seems much more the sort of thing that the army are going to be good at dealing with, whilst Eskom staff can get on with whatever their actual job is.