At Northern Offshore Services, we are fully committed to sustainability and performance, and we are leading the way in the industry by providing innovative Green Technology solutions.

Northern Offshore Services' Green Technology initiative will transform our company into a sustainable shipping company ready to meet the future and lead the way for a greener, more sustainable industry. We have two focus areas for the coming years.

Firstly, to develop and produce vessels with low environmental impact, still with high offshore availability, safety, and range. We set the standard with the unique, state of the art and future proof N-O-S CTV’s.

Our second focus area is to prepare and adapt our existing fleet for alternative energy sources. We are now developing, constructing, and converting vessels for higher performance and emission reduction equipment to lead the way and help make the industry become more sustainable.

Our advanced vessels are built for the future, delivering the best performance while upholding sustainability and safety standards to meet even the toughest challenges. With a focus on reliability and meeting our customers’ unique needs 365 days a year, we are dedicated to creating a more sustainable planet through our commitment to Green Technology. We set the standards. We are BEST365.



E-CLASS series, N-O-S’s fourth generation vessel design is a 40 meters crew transfer vessel that offers offshore accommodation for charteer’s personnel. The focus of the E-Class design is high offshore performance and reduced carbon footprints. Through a diesel-electric propulsion system together with batteries and an effective propulsion system, the vessel can run in direct diesel mode with PTO and peak shaving, diesel-electric mode, and purely on batteries in standby mode or during slow steaming operations. With the possibility to replace the diesel engines with electrical engines already in place, the E-Class is a vessel designed with the future in mind. The E-class design allows significant CO2 reductions with increased performance. The effective propeller design reduces CO2 by up to 50% during push-on compared to traditional CTVs. This 40-meter-long Crew Transfer Vessel built for the toughest challenges is a real power vessel expected to perform with 30 tons bollard push.

The I-Class series

I-Class design series is Northern Offshore Services' first fully electric prepared CTV and next generation N-O-S design. The first delivery of the I-Class is set for 2024. The vessels are a guiding star that will lead the industry into a more sustainable future. The I-Class, with its 33 meters and innovative hull, is giving the travellers a whole new comfort experience.

The I-Class vessels will be highly effective and the design of the vessel will save up to 50 % fuel, compared to other high performance vessels on the market.

Offshore charging

What is the next step? To enable the highest offshore availability in Zero emission mode there is a need for offshore charging. The electrification of the shipping industry needs it. Northern Offshore Services research and development for different offshore charging options are ongoing.

Energy simulations

We want to provide our clients with reliable marine battery solutions. Together with our preferred shipyard, our R&D department has developed the N-O-S Energy Simulation software. This enables calculations of the battery capacity required for specific wind farm projects. The system allows us to enter parameters such as distances, push-ons, transits and calculate the battery capacity needed to run a full day in the field. With the N-O-S Energy Simulation clients can feel safe that we provide safe, reliable, and efficient service and solutions at sea.


We believe in Electrification. But until we are fully there, we need to explore and assess the alternatives to provide our clients with environmentally effective and reliable solutions. We focus on how to adapt our existing fleet to alternative fossil-free energy sources today. Whether it is methanol, green hydrogen, or HVO we evaluate all alternatives when it comes to environmental benefits and plan for upgrades of our entire fleet.



The second focus area for N-O-S sustainable future is to take care of what we have and update our current fleet. We have about 45 vessels that will be upgraded. We have a plan in place and we have already started.

M-Class hybrid

Two vessels from our M-Class series, Mover and Maker are the first in line for battery preparations. During early 2022, we will carry out a complete upgrade of the two. The vessels will have a new Volvo Penta IPS propulsion system and be prepared for battery installation. The preparation entails making rooms for batteries and preparing the main engines for diesel-electric propulsion. In short, enabling the engines to run on a combination of fuel and electricity.


In 2020 one of our A-Class vessels – Assister – was rebuilt and upgraded. The vessel was extended from 19 meters to 25 meters, utilizing recycled aluminum. The vessel upgrade included a new driveline with 4 x Volvo Penta IPS system and the interior was refurnished with 12 additional seats, making former Assister, now Traveller to a 24 Pax CTV. The transformation from Assister to Traveller gave the vessel a whole new lifespan.


Northern Skagerrak

Northern Skagerrak is a 45 meters tanker vessel currently operating in Gothenburg-Skaw area between Denmark and Sweden. The vessel is scheduled for engines conversion from conventional diesel propulsion to diesel-electric propulsion. With diesel-electric propulsion, the vessel is able to use the electricity generated by the auxiliary engines to propel the vessel, and the other way around, it enables the main engines to generate electricity. The main goal is for the vessel to operate with zero emissions in the harbour of Gothenburg, which will improve the air quality in the area.