> There are not, in fact, a limited number of pumped storage sites, and you do not, in fact, need any alpine lakes. Dikes are not commonly made of concrete. Th

> There are not, in fact, a limited number of pumped storage sites, and you do not, in fact, need any alpine lakes. Dikes are not commonly made of concrete. There are a limited number of economically viable pumped storage sites. You can find papers claiming an effectively limitless amount of hydroelectric storage. The problem is that most of these places either already use dams for most of their energy production and thus don't need to build any storage. Or, they are in extremely remote areas where construction is prohibitively expensive. There's huge hydroelectric potential in Tibet. But that's incredibly remote and prohibitively expensive to develop. > And, there are numerous other cheap alternative storage media, for places without hills. Such as?