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Edda Mistral arrives in Grimsby

By: Tom Russell 12/09/2018 Ørsted

General Vessels Windfarms

Edda Mistral has arrived at the Royal Dock in Grimsby following sea trials. Although primarily intended for use during the operations phase of Hornsea Project One, the project team brought forward the Maiden Voyage so it can also be used to support construction.

In the construction phase, Edda Mistral will primarily be used by JDR Cables to complete the last step of the array cable termination, connecting the array cables to the turbine switchgear located in the transition piece.

The vessel has already visited the offshore site for some testing, including trying out the motion compensated gangway to access wind turbines, deploying the work boat and landing a helicopter on the helipad.

The vessel is now at Grimsby docks whilst Ørsted fit out IT and communications systems such as Tetra radio and offshore management system equipment.

Stuart Reid, Head of Ørsted’s East Coast Operations in the UK, said: “Hornsea Project One is a step-change in offshore wind farms in terms of scale, capacity and distance from shore. We provide offshore logistics for some of our contractors, so in this case we planned to use a vessel we already had, rather than hiring a new one.

“I personally am very excited to see the Mistral join its sister out at sea. The Passat and Mistral are unique vessels, and proudly bear the Grimsby name on their side. They were purpose built for our operations in Grimsby, including Race Bank, and Hornsea Project One, and so it’s great that the Mistral can be used to benefit our construction team too.”

When Hornsea Project One becomes operational in 2020 it will overtake Walney Extension, officially opened by Ørsted this month, as the biggest offshore wind farm in the world. At 120km from the coastline, it will also be the furthest from shore that a wind farm has ever been built.

Lars Høy Jørgensen, Head of Operations Logistics, the team that has lead the development and delivery of the vessel, explains: “Building further offshore allows for bigger wind farms with much higher wind speeds. As a wind farms get further and further out to sea, it becomes more efficient for technicians to stay offshore for weeks at a time, rather than retuning to shore every day, a bit like oil and gas operations.

The SOVs have all the facilities needed to house technicians as they work offshore, including a gym, cinema and individual cabins that in total can sleep 60 people. A motion compensated gangway ensures safe transition to the turbines by allowing technicians to easily walk to work. “

Edda Mistral is sister vessel to the Edda Passat, also built by GONDAN. Both measure about 81m length and 17m beam. They have the capacity to accommodate up to 40 technicians who will perform maintenance tasks on the wind farms, and a crew of about 20 people.

Both vessels are equipped with an UPTIME 23m length heave compensated walk-to-work gangway, a 3D compensated crane and a crew transfer vessel landing system with bunkering facility. In addition to the gangway, the vessel is equipped with a Helideck and a 11m daughter craft that will allow the safe transfer of maintenance technicians to the offshore wind turbines.

Edda Passat is supporting maintenance activities at the nearby Race Bank wind farm and arrived in Grimsby six months ago.

For more information on offshore wind farms service vessels, click here.

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Edda Mistral arrives in Grimsby

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