Calgary-based Enerplus Corporation and its subsidiaries have made a name for themselves in the US energy sector through their relentless pursuit of crude oil and natural gas exploration and development. The company's extensive portfolio of oil and natural gas properties is mainly concentrated in North Dakota, Colorado, and Pennsylvania. Since its inception in 1986, Enerplus Corporation has remained headstrong and committed to its mission of securing energy resources that are critical to America's economic growth and prosperity.