It holds oil and natural gas property interest in the United States and in western Canada, in the provinces of Alberta, British Columbia and Saskatchewan.

Enerplus was established in 1986 by Marcel Tremblay, a pension fund manager and John Brussa, a lawyer.

[3] In 1996, Mark Resources renamed itself Enermark, became an income trust, and joined the Enerplus group of companies.

[10] In 2024, it was announced that Enerplus would be acquired by Chord Energy for US$3.8 billion in cash and that its stock would be delisted from the TSX and NYSE.

[12] As of 2015, Enerplus produced 110,800 barrels per day, 55% from natural gas, and 45% from crude oil and other liquids.