Enel Green Power’s nearly-complete 185MW HillTopper wind farm in the US state of Illinois will feed some of its power to Starbucks, under a unique deal with power retailer Constellation.

Constellation, owned by Chicago-based utility group Exelon, has contracted 14MW of output from HillTopper, which it will then sell it to Starbucks – enough to cover all of the power needs of 340 of the coffee giant’s stores in Illinois.