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Hi,
Compressed air is a storage medium; not a fuel.
A method that has been proposed for using compressed air, is in conjunction with a large solar array in the southwest USA (or a large number of wind turbines) is after it is transmitted to population centers, if it is not needed just then -- use the excess electricity to run large air compressors. Use these to pump air pressure into existing large underground caverns (where there used to be natural gas, for instance) -- and then when electricity is needed beyond what is coming from the renewable arrays; then reverse the process. The stored air pressure can be used to run turbines to generate electricity on demand.
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