That's where pumped-hydro storage is so important, because it can store energy at the grid scale. For pumped-hydro storage, you need two reservoirs with a significant height difference; water flows down from the top reservoir to the lower reservoir generating electricity by spinning the. . e differences in height between reservoirs. Solar energy production can be affected by season, time of day, clouds, dust, haze, or obstructions like shadows, rain, snow, and. . If we adopt solar and wind as major components of our energy infrastructure as we are weaned from fossil fuels, we have to solve the energy storage problem in a big way. An earlier post demonstrated that we do not likely possess enough materials in the world to simply build giant lead-acid (or. . Pumped storage hydropower (PSH) is a form of clean energy storage that is ideal for electricity grid reliability and stability. PSH complements wind and solar by storing the excess electricity they create and providing the backup for when the wind isn't blowing, and the sun isn't shining. In this energy and power science fair project, you'll make a. .