I dunno I thought there outline covered that: " The process follows a number of stages: 1."Wrong-time electricity" is used to take in air, remove the CO2 and

I dunno I thought there outline covered that: " The process follows a number of stages: 1."Wrong-time electricity" is used to take in air, remove the CO2 and water vapour (these would freeze otherwise) 2.the remaining air, mostly nitrogen, is chilled to -190C (-310F) and turns to liquid (changing the state of the air from gas to liquid is what stores the energy) 3.the liquid air is held in a giant vacuum flask until it is needed 4.when demand for power rises, the liquid is warmed to ambient temperature. As it vaporizes, it drives a turbine to produce electricity - no combustion is involved " There is even a mention of using waste heat from other sources to expand the gas further.