DEME has launched its first ever Service Operation Vessel (SOV) at the CEMRE shipyard in Yalova, Turkey, marking a major milestone in its fleet history. Named Groene Wind,  the Small Waterplane Area Twin Hull (SWATH) vessel will be deployed for wind farm maintenance activities.

Groene Wind is due for delivery in 2021 and will be directly chartered to Siemens Gamesa Renewable Energy (SGRE) for 15 years for the maintenance of the Rentel and Mermaid Seastar (known as SeaMade) offshore wind farms in Belgium. It will be the first DP2, twin-hulled SOV in the world and the first to serve three different wind farm sites.

Total package of services for the offshore wind industry

DEME stated that by investing in such a vessel means it can offer the total package of services to the offshore wind industry now – from installation right through to maintenance.

DEME’s in-house newbuild team worked in close collaboration with Vuyk Engineering Rotterdam and research institute MARIN. The new vessel has a focus on improves safety, comfort and workability for wind farm technicians – even in the roughest sea conditions.

Impressive cuts in fuel consumption

According to DEME, the SWATH design ensures low wave impact on movements when approaching wind turbines, compared to a traditional monohull SOV. Groene Wind will enable safe crew transfers in significant wave heights. Its DP2 technology means that the vessel can hold its position in rough seas but at the same time operate with lower fuel consumption when compared to traditional SOVs. An impressive fuel consumption reduction of up to 50% can be achieved compared to a monohull SOV, further reducing the cost of wind farm maintenance.

In line with its green credentials, environmental considerations are integral to the vessel design and include a waste heat recovery system and a Clean Design notation.

At 60 m long, the SOV will be equipped with a motion compensated gangway and daughter craft to safely transfer technicians to the wind turbines. It is also designed according to the latest comfort standards, allowing the vessel to host up to 24 technicians and a nautical crew.

Michael Glavind, Business Unit Director DEME Offshore, enthuses: “We are proud about this major milestone and look forward to welcoming ‘Groene Wind’ to our fleet. She highlights the DEME innovative spirit and our willingness to invest in green technologies. This further boosts our ability to serve the growing offshore wind industry, throughout the entire lifetime of an offshore wind farm. We are delighted to take this important step together with our partner Siemens Gamesa Renewable Energy, which also shares our ambitions for the energy transition.”

Rene Wigmans, Head of Offshore Service Logistics Siemens Gamesa: “Siemens Gamesa is dedicated to finding flexible and competitive solutions. The Rentel and SeaMade wind farms make up the largest wind power installation in Belgium and with DEME’s first ever SOV ‘Groene Wind’ we will be able to provide further optimised and safe maintenance solutions.”