Spectra was formed in late 2006 as a spin-off from Duke Energy. Spectra owned the Texas Eastern Pipeline (TETCo), a major natural gas pipeline transporting gas from the Gulf of Mexico coast in Texas to the New York City area; TETCo was one of the largest pipeline systems in the United States.[16] Spectra also operated three oil pipelines, numerous other gas pipelines and was proposing to build still 3 more gas pipelines in the U.S.[17] The merger was completed on February 27, 2017.[18]