Page 28: of Offshore Engineer Magazine (Nov/Dec 2025)

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HYBRID TECHNOLOGY OLYMPIC SUBSEA

Stig Remøy presents data demonstrating the success of his 'efficiency first' strategy. The chart shows that the new CSOVs, Olympic Boreas and Olympic Notos, have achieved a roughly 50% reduction in fuel consumption per gross tonnage compared to the company's older vessels, proving the business case for the new technology.

Image courtesy Josefne Spiro

The latest vessels layer on more advanced solutions, in- X-STERN hull is purpose-built for both wind and subsea cluding a four-thruster azimuth propulsion system — pro- work, allowing either end to face the weather to reduce viding what Remøy likens to a maritime ‘four-wheel drive’ energy use during dynamic positioning.

— as well as permanent-magnet (PM) technology, vari- The results in the feld are stark: able-speed generators, and waste-heat recovery systems. • Operational Output: Independent client

The impact is substantial. A modern vessel of around measur ements confrm more than 25% higher 6,700 gross tonnes with up to 126 personnel can now op- operational effciency than competitors. On wind erate on approximately three tonnes of fuel per day in cer- farms like Horns Rev, for example, the vessels can tain scopes, whereas older conventional ships might con- ser vice up to 200 turbines in the time it takes sume three to four times that amount. others to manage 150.

Remøy emphasized that the economics support these high- • Energy Savings: Olympic’s own data reveals the er-cost, higher-effciency choices. “These kinds of technology ne w systems have driven a roughly 50% reduction choices have always paid off for us," he said. "When we built in energy consumption compared to its 2012-era feet.

our frst diesel-electric PSV in 1999, conventional options “The uplift comes from the total system,” Remøy ar- were about 20% cheaper, but we chose it because we knew gued. “It’s the vessel itself, the gangway, how quickly you the energy had to be paid for... With carbon taxes multiplying get to the tower, how effciently the engineers can perform by 2030, the return on energy effciency will only get bigger”. maintenance, and how you manage the weather windows”.

A key component is the vessel's W-type Ampelmann gang- way, a fully electric system with an integrated lift and a

A NEW GENERATION OF HARDWARE: large operational envelope, compensating for landing

THE SX222 AND UT 7623

Leading this new generation are the company’s two heights from approximately 8 to over 30 meters.

Building on these lessons, the next leap is the Kongsberg

Ulstein-designed SX222 CSOVs, Olympic Boreas and

UT 7623 SEV. Developed in partnership with Kongsberg

Olympic Notos. Built at Ulstein Shipyard using state-of- the-art Norwegian technology, its bi-symmetrical TWIN Maritime, two of these Sustainable Energy Vessels are 28 OFFSHORE ENGINEER OEDIGITAL.COM