Spectra Energy Corp was a natural gas infrastructure company that owned and operated a portfolio of natural gas-related energy assets. The company was formed in 2007 as a spin-off from Duke Energy and was headquartered in Houston, Texas. Spectra Energy operated in three key areas: transmission and storage, distribution, and Western Canadian midstream. The company's transmission and storage business included more than 21,000 miles of transmission pipelines and 305 billion cubic feet of storage capacity. Its distribution business served more than 1.5 million customers in Canada and the United States. The Western Canadian midstream business included natural gas gathering, processing, and transportation facilities in British Columbia and Alberta. In 2017, Spectra Energy was acquired by Enbridge Inc., a Canadian energy infrastructure company.