Mr Radtke joined Dominion as president and CEO of its exploration and production operations in 2001. He previously worked at the Santa Fe Snyder Corporation of Houston, which merged into Devon Energy in 2000.

He is a native of Wausau, Wisconsin, and a graduate of the University of Wisconsin with a bachelor’s degree in mining engineering.

Thomas Farrell II, chairman and CEO, said: Dominion is extremely grateful for Duane’s outstanding leadership and business counsel. We wish him an enjoyable retirement.