Siemens will install six additional turbines at the Norderhof wind farm on the North Sea coast of Germany, boosting the installation's capacity to 37.7 MW.
The Model SWT-3.6-120 turbines, each of which has a rated capacity of 3.6 MW, will be erected in the late summer of 2014.
The contract with installation operator Bürgerwindfarm Galmsbüll includes maintenance of the wind farm for a 20-year period.
The first section of the Norderhof wind farm, consisting of seven Siemens Model SWT-2.3-93 wind turbine units, went on line in 2007.
In anticipation of the next year's work on the site, the Siemens’ project team and the consultant engineers at Denker & Wulf AG have been investigating possible shadowing effects and increased turbulence for the legacy installations.
“Due to the short distances between the units, taking optimum advantage of the additional potentially useful wind area increases the burden on the existing turbines,” said Torsten Levsen, managing director of Bürgerwindpark Galmsbüll GmbH & Co. KG.
Levsen said the analysis has shown the stability of Siemen's systems to be an advantage -- so much so that "hardly any compromises were needed when planning Norderhof II.”