First Mono Bucket Foundation Decommissioned at Horns Rev 2

On 7th July, the Horns Rev 2 meteorological mast, supported by a Mono Bucket foundation was successfully decommissioned, since Dong Energy no longer required the met mast at its Danish offshore wind farm.

The Mono Bucket, which was one of the very first to be deployed and has been in situ for 6 years, has been completely removed from the site by DBB Jack-Up Services by reversing the suction process. By applying pressure into the Mono Bucket, the foundation was lifted from the seabed, leaving it unmarked.

Universal Foundation’s Head of Business Development, Kristian Jacobsen said: “Since 2009 the project has served as a key showcase to Universal Foundation and proved the feasibility of the Mono Bucket in an offshore working environment. The installation itself was innovative in the sense that the foundation was floated to the site by means of two simple tug boats, installation was quick and during operations the Mono Bucket required no scour protection proving that our system works. We are now delighted to add a successful decommissioning of the foundation to the project results. This is yet another testimony to the feasibility and flexibility of the Mono Bucket and suction technology in offshore wind.”

For DBB Jack-Up Services, this was an important step in expanding into offshore wind decommissioning. “Combined with the experience and skills of the DBB Jack-Up project organisation, our crew and jack-up vessels have once again completed a very challenging decommissioning task,” said Ole Jacob W. Nielsen, Chief Commercial Officer of DBB Jack-Up Services A/S. “In the race for cost-reduction we need to allow ourselves to step off the beaten track to test innovative solutions like the Mono Bucket foundation.”

The Mono Bucket has recently been chosen to support six 3MW turbines at the Icebreaker project in the United States.

Image: DBB Jack-Up Services A/S