If i am understanding you correctly, you are saying that you verified that dams with hydroelectric plants are no fly zones? If you find out what law or rule says that hydroelectric plants are security-sensitive (or otherwise restricted with respect to drone photo/video), I would be interested in seeing a link to that law/statute/rule. I have not seen such a rule on any FAA or other government sites. I personally plan to film more dams (we have lots of pretty dams in Pacific NW). Both dams that I have filmed at have hydro-electric plants and i was in plain sight of their security cameras both times as I was
standing right on top of the dam. One dam, The Detroit Dam in Oregon, is operated by the Army Corps of Engineers (as many dams are) and I actually talked with an employee at one point while I was filming and he made no mention of any such restrictions...he was just curious as to how much my drone cost. So I am dubious that such a rule exists. But if you find the law/statute/rule, let us all know and please post a link because most (hopefully all) of us do not want to break any laws

! Thanks. p.s. i posted one of my dam videos on youtube