New analysis from Bibby Marine shows how, from day one, electrification of offshore wind commissioning service operation vessels (CSOVs) can cut operator costs by up to 40% compared with conventionally fuelled vessels.
Savings on fuel and carbon costs can rise to as much as 70% when vessels are operated in fully electric mode where offshore charging infrastructure is available. The analysis is published in Bibby Marine’s whitepaper, The Electrifying Proof, which sets out the commercial case for electrifying offshore wind service vessels and addresses concerns about technological readiness, highlighting that the technology needed to electrify the CSOV fleet is available today at increasingly competitive costs.
Hybrid-electric eCSOVs use dual fuel generator sets to charge onboard batteries that power the vessel’s main electric propulsion when grid charging is not available. In this configuration, engine load and speed can be optimised to reduce energy consumption, fuel costs and carbon liabilities, saving as much as US$ 1m per year. Where offshore charging is available and fuel consumption and carbon emissions are cut to zero, costs can be reduced by as much as 70%, or an average of US$ 1.8m savings per year.
European regulation on carbon emissions by vessels servicing the offshore wind industry is being rapidly rolled out and will be effective from 2027. With 45GW of installed offshore wind capacity in the North Sea and a target of 300GW to be installed in the next 25 years, servicing these assets are forecast to become increasingly costly for wind farm owners in that region unless they take action to electrify their vessels and cut CO2 emissions and related tax costs.
The technologies needed for widespread electrification of CSOVs are ready to be deployed and falling battery costs are helping to lower overall eCSOV build costs. The Electrifying Proof shows the importance of collaboration. To build its eCSOV, Bibby Marine brought together OEMs of batteries, motors and engines, as well as offshore charging facilities. More widely, ports, offshore wind farm developers and turbine OEMs are said to need to work together to realise offshore charging at scale and deliver full electrification.
Offshore charging systems have already been integrated into wind turbines and can be deployed via monopile or floating hook-ups. To support rollout, clear licensing and permitting pathways are needed, with a regulatory environment that enables the economics to work for developers.
Gavin Forward, New Build Project Director, Bibby Marine, said: “The design of our vessel enables clean operations from day one, without reliance on offshore charging infrastructure, while remaining fully future proofed for connection when it becomes available. eCSOVs offer a clear route to lower operating costs compared with conventional CSOVs by reducing energy consumption, limiting exposure to rising carbon costs and future proofing operations. A battery-first architecture delivers improved operating performance, redundancy and flexibility over conventional vessel designs (internal combustion engines, for example), while increasing crew comfort and reducing underwater noise emissions. We are proud of our work with experienced technology partners to develop the first eCSOV for the North Sea market and help drive supply chain decarbonisation in the sector.”
Nigel Quinn, Bibby Marine CEO, added: “A fleet of zero-emission offshore service vessels should be the essential goal for the offshore wind industry to reinforce its own decarbonisation mission. Full electrification of the vessel fleet offers an opportunity for significant savings and has the potential to create budgeting stability for operators at a time when cost controls are crucial to the sustainability of the sector. The offshore wind industry can lead the way on full electrification for industries across Europe. We designed and built this ship to prove that what many thought was aspirational is, in fact, achievable. eCSOVs will empower operators to break free from the volatility of fossil fuel markets, with electricity costs aligned to a farm’s own clean energy production, securing long-term OPEX planning. This is the blueprint for a resilient, zero-carbon future.”
Bibby Marine drew together technology partners including Kongsberg, Corvus Energy and Stillstrom and laid the keel of its hybrid-electric eCSOV at the Armon shipyard in Vigo, Spain in 2025. The business expects to commission the new vessel in mid-2027. CSOVs are considered a crucial vessel class for offshore wind and will be tax liable for their carbon emissions under the EU’s emissions trading system and its FuelEU Maritime carbon intensity standards. Driving this vessel class to electrification will be an important step towards lowering costs and supporting offshore wind’s decarbonisation mission.
The whitepaper, The Electrifying Proof, is available to download here.
