It was not to survey their homes but to monitor the electicity supply point, which is not a sub-station in the sense you mean. As for the question about whether I would object to CCTV 'in my home', apart from your overstretching a point to make an argument, I have no objection. We are after all surveyed by CCTV day in day out, in thousands of locations so it is a bit of a fait accompli. Apart from which, if you've got nothing to hide you've got nothing to fear.
Giok