True, but the problem is many, many orders of magnitude larger. Looking at US numbers only, we would need to figure a way to store 51.69 TWh and supply over an

True, but the problem is many, many orders of magnitude larger. Looking at US numbers only, we would need to figure a way to store 51.69 TWh and supply over an 18 hour period. They are storing 233 MWh and distributing over 5 minutes. For a pumping station, that works out to 379.4 cubic kilometers of water lifted 50 meters in the air. For comparison, that is 20 times the volume of the Great Salt Lake. About the volume of Lake Erie once inefficiencies are factored in. I also ran the numbers a while back in a renewable energy class for lead acid batteries. That would require something like the entire lead production of the world for several years, just to handle the US.