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Electricity is transported from the three wind parks Butendiek, Dan Tysk and Sandbank to the mainland via the SylWin1 grid connection. Siemens is installing the grid connection in high-efficiency DC technology for network operator TenneT. The connection is scheduled to take up commercial operation in the first half of 2015 and a total of 240 Siemens wind turbines will supply 900,000 households with power.