The electricity to do that would (in the near term) be hydroelectric, so in energy terms you'd be chasing your own tail. I thought about this maybe being a use

The electricity to do that would (in the near term) be hydroelectric, so in energy terms you'd be chasing your own tail. I thought about this maybe being a usecase for small modular nuclear, another commenter suggested that that has already been done (when the US was running the show). Several others have commented on the environmental issues with pumping seawater into the freshwater ecosystems.