I've written a project work about the biggest pump storage plant in Germany and its impact on the environment. Nature conservationists sued the people responsible for the project because, for example, it affected endangered animals living in that area and it made the landscape ugly (the builders blew up the top of the mountain). The conservationists also said that the pump storage plant wasn't necessary and only helped owners of coal and nuclear power plants (because it needs energy to pump the water up) or that pump storage plants couldn't store enough energy to make the country run on renewable energies.