SWEDEN The wind turbines in Sweden's second oldest offshore wind farm have stopped turning. The last turbine at Yttre Stengrund was disconnected a few days ago and for the first time in the world, the work of dismantling an offshore wind farm will now start.

The final turbine at Yttre Stengrund was decommissioned on 2 November. The four other wind turbines have not been operating for some time as it has not been economically viable to repair or replace them.

Maria Hassel is project manager for the dismantling of Yttre Stengrund, which is located in the southern part of Kalmar Sound and came into operation in 2001. Vattenfall took over the wind farm in 2006 when Elsam and Energi E2 were acquired.

Maria Hassel explains that the work of dismantling the wind farm will start in mid-November.

"The turbines, rotors and nacelle must be dismantled first. The foundations will be cut off level with the sea bed. The cables will be removed some time next summer. Once that has been done we will conclude the project."

Early cost
Vattenfall is the first company in the world to dismantle an offshore wind farm which has come to the end of its useful life. The preparations were started directly after the decision was made two years ago.

"The procurement was implemented in the spring and the contract was signed in early summer this year," says Maria Hassel, who didn't want to comment on the cost of the project.

Lely to be taken down
Vattenfall/Nuon have also decided to dismantle the Lely wind farm, which is located in Lake Yssel in the Netherlands. The wind farm consists of four 500kW turbines and was first commissioned in 1994.

"We are in contact with that project and are sharing our experiences step by step as the project proceeds," explains Maria Hassel.

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