What kind of IP can a hydro-electric dam have that isn't "general knowledge" at this point? *Edit: Batteries used for Electric Vehicles* Also for some contex

What kind of IP can a hydro-electric dam have that isn't "general knowledge" at this point? *Edit: Batteries used for Electric Vehicles* Also for some context, related to China-Canada relations; there has been rumour that China has operated state run (semi-secretly) policing departments in BC and other areas of Canada and has forced people to return to China that were legally in Canada. AND Canada has recently been engaged in a trade mission specifically with South East Asian countries (bypassing China) for textiles/garment production. (I have no idea what Canada is offering in return for cheaper clothes.) {Probably some kind of natural resource.}