Duke Energy Corp. (DUK NYSE) on Monday said the natural gas business that it is in the process of spinning off will be named Spectra Energy Corp.

Duke said in June that it would spin off the business to its shareholders as a separate, publicly traded company, but did not name the new company. Spectra will include Duke's natural-gas transmission unit, which owns about 17,500 miles of pipeline, as well as its 50 percent stake in Duke Energy Field Services.