This isn't new...I recall grad students working on this as far back as 2010.

Some citations from an article: “Bottled wind could be as constant as coal.” Wired Magazine. Retrieved 7/15/2010, 2010, from http://www.wired.com/wiredscience/2010/03/compressedair-plan... 59

Cavallo, A. (2005). Controllable and affordable utility-scale electricity from intermittent wind resources and compressed air energy storage (CAES). Science Direct.