SpikesOtherDog, 10 months ago I believe this is what you are referring to cavernenergy.com What is happening in this process is a cavern is pressurized with air and the air pressure is later used to run a turbine.
I believe this is what you are referring to
cavernenergy.com
What is happening in this process is a cavern is pressurized with air and the air pressure is later used to run a turbine.