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DONG dismantles Danish wind farm

By: Tom Russell 06/09/2017 DONG Energy

General Windfarms

DONG Energy has completely dismantled the Vindeby offshore wind farm near Lolland in the south east of Denmark. The project was constructed in 1981 and marked the birth of the offshore wind industry.

Vindeby, located 1.5-3km offshore, consisted of 11 offshore wind turbines and was connected to the grid in 1991. After more than 25 years of service, DONG Energy – owner and operator of the wind farm – decided to decommission it.

In March 2017, contractors commenced the dismantling of the 11 wind turbines. Blades, nacelle and tower were dismantled and taken down individually by a mobile crane and placed on board a so-called jack-up vessel.

The concrete foundations were broken down on site, mainly by hydraulic demolition shears and a hydraulic hammer, but also by breaking down the concrete using milling tools. The broken-down concrete and reinforcement structures were subsequently collected.

Throughout the dismantling process, up to 20 workers have taken part in the work, which took place in periods when the weather permitted offshore work. Water depths of only 2-5m added to the challenging conditions, as only a limited selection of vessels were able to work in the area.

All wind turbine components and parts from the foundations were shipped to shore in Nyborg Harbour. The components will be reused as much as possible as spare parts for other wind turbines, while the blades will be reused in an innovative noise barrier concept. Prior to this, however, some of the blades will become part of a research project at DTU Risø. Components that are not immediately reusable have been transported to a certified recovery company.

One wind turbine will become part of the exhibition at the Danish Museum of Energy in Bjerringbro in Jutland.

During its operational lifetime Vindeby covered the annual power consumption of around 2,200 households in Denmark. In comparison, DONG Energy's future offshore wind farm off the east coast of England, Hornsea Project One, which when ready for commissioning in a few years will be the world's largest offshore wind farm, will be able to supply green energy to approximately one million households.

Hornsea Project One is setting a record as the 174 offshore wind turbines will be located an 120km offshore where the strong winds will ensure a high level of power production from each of the large wind turbines explained DONG.

The wind farm is to be built 120km east of the Humber Estuary and will cover an area of approximately 407km², which is over five times the size of the city of Hull. Offshore construction is anticipated to begin in March 2018 with full commissioning expected for the first half of 2020.

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DONG dismantles Danish wind farm

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