Duke Drilling Company is a division of Duke Energy, a diversified energy company with a portfolio of natural gas and electric businesses, both regulated and non-regulated, and an affiliated real estate company. Duke Energy supplies, delivers and processes energy for customers in North America and selected international markets. Headquartered in Charlotte, N.C., Duke Energy is the largest producer of natural gas liquids in North America and one of the largest marketers. Duke Energy Field Services gathers, processes, transports, markets and stores natural gas and produces, transports and markets NGLs as a joint venture of Duke Energy and ConocoPhillips. Duke Energy Gas Transmission serves its customers by transporting natural gas from North America's major supply areas and growing supply sources to markets in the northeastern and southeastern United States and in Canada. In addition to its vast transmission pipeline assets, the company stores natural gas, distributes natural gas to retail customers in Ontario and gathers and processes natural gas for customers in western Canada. One of the largest investor-owned electric utilities in the U.S., Duke Power provides safe, reliable and economically priced electricity to more than 2 million customers in North Carolina and South Carolina. Duke Energy International owns and operates power generation facilities and sells electric power and natural gas. Its primary focus is on power generation activities in Latin America.