It is one of the reasons for the new undersea cable to Norway. When we have excess wind then we can pump water up a mountain there, and when we don't the we ca

It is one of the reasons for the new undersea cable to Norway. When we have excess wind then we can pump water up a mountain there, and when we don't the we can release it and recapture some of that energy. Problem is, that is currently only 1.4GW of capacity. We'll need a whole lot more of it to get fully off gas or nuclear.