Enger became head of Hydro Exploration and Production due to his handling of the Oseberg project. He was head of E&P from 1987 to 1996. During this period the Hydro Oil and Gas business increased substantially by adding a number of fields to its North Sea portfolio. Fields where Norsk Hydro was the operator included Oseberg, Brage, Njord, and Troll oil. During this period Norsk Hydro production operatorship went from zero to roughly 1 million barrels per day. The portfolio also included E&P activities in Russia, UK, Maghreb and Angola.
