Interesting, looks like this might be a press release describing that (or a similar) project? [1] Proposed wind plant in Wyoming connecting to compressed air energy storage in Utah. Can't find much about where the project went though...

Looks like there are at least 3 operating CAES plants: Huntorf, Germany [2], McIntosh, Alabama [3], and Gaines, Texas [4].

[1] http://www.duke-energy.com/news/releases/2014092301.asp

[2] https://www.eon.com/en/about-us/structure/asset-finder/hunto...

[3] http://www.powersouth.com/mcintosh_power_plant

[4] http://www.generalcompression.com/index.php/tdw1