With power generation in the grid becoming more diverse and decentralized, energy storage is becoming more and more important. Eduard Heindl's gravity storage is an approach to storing electrical energy as potential energy by lifting huge masses cut out of the ground. While this sounds crazy, there are lots of reasons why this makes sense. In the episode we discuss then need, the general approach, the construction process and some of the engineering challenges. We also look at the innovation process, the path from the idea to something that is ready to be built.