OKEA ASA announced production from the Hasselmus gas discovery commenced on 1 October 2023. As a subsea tie-back to the Draugen platform, Hasselmus is expected to add 4,400 barrels of oil equivalents per day in production at plateau. The Hasselmus project is expected to recover approximately 1.65 GSm3 of natural gas and will restart export of associated gas and NGL from Draugen.

The Hasselmus gas discovery is located on the western edge of the Trondelag platform in the Norwegian Sea, 7 km northwest of the Draugen platform. A single well (6407/9-9 T2) was drilled on the Hasselmus structure by A/S Norske Shell in 1999 which encountered a 16 meters gas column and a 6.8 meters oil column in high quality sands at a depth of 1,700 meters.