Yes prepa is slowing down the work by many different ways and by moving the units to different areas without finishing that area. Some in my opinion is friends of the gobernor to make AEE/PREPA look worse and push for the sale, but a lot of it is total and complete incompetence, specially with such a massive damage.
Lots of private contractors are complaining that they were brought to the island to sit down and get a free check because of no materials and also not being assigned a route/work zone. Not all crews are out and about, a lot are sitting on their hands. It is federal money so the government and prepa are politiking and not trying to get it done fast. Lots of finger pointinng. The crews that are out work hard at 3-5 times the salaries payed to UTIER union employees, so I expect that some may start danaging the work in protest.