Piedmont Natural Gas Co. Inc., an energy services company, distributes natural gas. It operates in three segments: Regulated Utility, Regulated Non-Utility Activities, and Unregulated Non-Utility Activities. The company also operates energy-related businesses comprising unregulated retail natural gas marketing, regulated interstate natural gas transportation, and storage and regulated intrastate natural gas transportation. It distributes natural gas through transmission pipelines and distribution mains. The company serves approximately one million residential, commercial, industrial, and power generation utility customers in North Carolina, South Carolina, and Tennessee, including wholesale customers served by municipalities. Piedmont Natural Gas Co. Inc. was founded in 1949 and is headquartered in Charlotte, North Carolina. As of March 14, 2016, Piedmont Natural Gas Co. Inc. operates as a subsidiary of Duke Energy Corporation.