Norwegian energy service firm Aker Solutions will prepare the topsides of Equinor’s Troll B and C platforms off Norway to receive electricity from shore via cable.
Aker Solutions did not provide an exact contract value, but said it was worth somewhere between £170 million and £255m.
The platforms, located about 40 miles off Bergen, are currently powered by gas turbines.
Aker Solutions will carry out engineering and construction work at its offices in Bergen and yard in Egersund.
The award follows completion of the front-end engineering and design (FEED) work that Aker Solutions was awarded in January 2020.
Work will start immediately and is scheduled for completion at the end of 2025.
The project is expected to create work for about 4,000 people, including employees working with suppliers and services providers.
Aker Solutions chief executive Kjetel Digre said: “Reduction of climate footprint is high on the agenda for our customers in the oil and gas industry.
“Electrification of production platforms is one of the ways to reduce emissions from such operations.
“Aker Solutions has extensive experience from delivering such low-carbon solutions, and we aim to be a leading contractor in this market.
“We are excited to collaborate with Equinor on the Troll electrification.”
A number of operators in the UK North Sea are examining electrification plans for their assets.