This paper describes a scheme whereby surplus power during reduced demand periods is used to liquefy air which can be stored and used later to supply peak power with considerably reduced fuel requirements. All the component processes of the system are established techniques, are very largely automatic in operation, and the location is on-site. Such a system can be constructed and placed on-line in a minimum of time and with greatly reduced pollution control requirements. It is capable of considerable flexibility in the use of the liquefied product as air or as the separated constituents as O2 and N2, and thus furnishes a number of ways of optimum utilization as operating conditions and economic circumstances change.

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