Bill Gates mentioned pressurized pumped-hydro storage in his book, (which was the first I had heard of it), and it sounds quite promising and something Texas is

Bill Gates mentioned pressurized pumped-hydro storage in his book, (which was the first I had heard of it), and it sounds quite promising and something Texas is well-suited for: > GLIDES costs as low as $13/kWh and $346/kWh and roundtrip efficiencies as high as 80% can be achieved using depleted oil/gas reservoirs and high-pressure pipe segments as pressure reservoirs, respectively. https://www.energy.gov/sites/prod/files/2019/12/f69/02_ORNL_Momen_GLIDES_FINAL.pdf https://www.energy.gov/sites/prod/files/2019/12/f69/02_ORNL_...