China’s 40-Story Concrete Battery Just Made Lithium Look Primitive
China built a 40-story tower that stores renewable energy by lifting and dropping concrete blocks — no lithium, no cobalt, no chemical degradation. While the West chases increasingly exotic battery chemistries, this brutally simple approach exploits the one thing that never wears out: gravity. It’s not elegant in theory, but it might be the most practical grid-scale storage solution we have.