Pumped storage is popular in the mountainous parts of Germany. They have "6,806 MW" of pumped storage capacity:
https://www.hydropower.org/country-profiles/germany That doesn't tell you much though, does it? 6,806 MW for how long? A half hour? One day? In Belgium they are talking about building a large hole in the ocean for pumped energy storage. Seriously. See: https://www.kcet.org/redefine/belgium-may-build-hole-in-the-ocean-to-store-energy - Jed
