This project will use water electrolysis powered by renewable electricity for clean hydrogen generation: https://www.energy.gov/lpo/advanced-clean-energy-stora

This project will use water electrolysis powered by renewable electricity for clean hydrogen generation: https://www.energy.gov/lpo/advanced-clean-energy-storage https://www.energy.gov/lpo/advanced-clean-energy-storage As of 2017 the US had about 250 GWH of pumped-storage capacity and the world had about 1600 GWH: https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricity https://en.wikipedia.org/wiki/Pumped-storage_hydroelectricit... So this one project can store more energy than all American pumped-storage projects. Pumped-storage is more efficient but it takes much more mass because gravity is such a weak force.