Hi DF, I used to do surveys on the fish sucked into the cooling water of Dungeness A & B power stations and many other seawater cooled power stations in the uk so I may be able to help you a bit. It is unlikely that you would be allowed to work alone on the coooling water systems, as my colleagues I and with decades of experience had to undergo an induction course on each power station once per year, as well as follow health and safety guidelines and set up safety barriers when we opened up the water channels to collect the fish. There was no evidence for animals growing bigger near power stations when I was working in this area and this kind of investigation stopped when the power industry was privatised and the research teams made redundant. What timescale do you have for your project, and in what season would you be doing it. Do you have any expertise in identifying any kinds of wildlife, do you have any access to the environment or an area where you can carry out experiments?