Some technologies just seem to make sense. But everything has to line up correctly for a technology to move forward. When I was in Switzerland five or six years ago, the Swiss were considering putting in pumped storage so that low-cost wind from the north and low-cost solar from the south could be stored and then delivered to the rest of the continent at peak times. In 2016, the 1000-MW Linthal pumped storage hydro power plant was successfully synchronized to the Swiss grid bringing this vision to pass.