The cheapest gravity storage is capable of holding itself up. Which is why vertical glaciers are so tempting. Its just ice, you pile it up, in large columns, w

The cheapest gravity storage is capable of holding itself up. Which is why vertical glaciers are so tempting. Its just ice, you pile it up, in large columns, with a puddle of water beneath. Energy is extracted by warming the water and taking part of the pressure to a turbine. Energy is added by pumping and freezing water on top, while the extracted heat is stored in a side tank for later usage. Insulation against heat prevents energy loss for longer times. Four T-beams hold up the freezing machinery on top. Storage grows with demand. If the ice starts to deform, added carbon-flakes, can increase tensile strength. Pressure in the pool is kept via onion-seals https://imgur.com/iCg9LzY https://imgur.com/iCg9LzY