This item is part of the Energy Storage - Special Issue - 07/2020, click here for more
Storing energy is not new to humanity. We have recognized the power in falling water for more than 5 millennia. From water wheels to hydroelectric plants, we have learned to harvest the latent energy stored in moving water. We even learned to pump water back uphill to release it later when we needed more energy than our hydroelectric plant could produce conventionally. Pumped water storage dates back to 1929 but we haven't made much progress since then until recently with new energy storage technologies gaining ground.