Rosenberg Worley will manage the life extension of the Jotun FPSO to help secure oil and gas production from the Balder field, originally developed by ExxonMobil, until 2045.
Local suppliers in the southern Norway region will account for much of the support work.
Rosenberg Worley started planning activities for the program this May, which is being coordinated with ongoing FEED work that Aker Solutions started last December.
Aker Solutions will continue to provide engineering services during the execution phase.
Vår Energi aims to transport the FPSO to the yard in Stavanger next spring for an estimated 15-month stay. Once the extension works are finished, the vessel will return offshore for installation at the Balder field.
Jan Narvestad, managing director at Rosenberg, said the project would require a workforce of more than 1,500 at peak.
Redevelopment of the two fields will also entail drilling 15 new production wells in the Balder field area and 11 new production wells in the Ringhorne field area.
In both cases, activities will take place while production continues at the two fields.
Vår Energi plans to further increase the reserves in the area through an exploration program, scheduled to start in 2020.