Rolls-Royce has received a £20m ($30.9m) contract to supply engines and propulsion equipment for four gas-fuelled ferries.

The ferries will be built for Norwegian operator Torghatten Nord and will serve two routes across Vestfjorden in Lofoten in the north of Norway.

The vessels will feature Rolls-Royce’s hybrid shaft generator electrical system, which produces electrical power with reduced fuel consumption and emissions, according to the company.

The ferries will be built by the Remontowa Shipyard in Gdansk, Poland, for delivery in the second half of 2012.