The German manufacturer has also signed a 20-year service and maintenance agreement for the 15MW project based on the Baltic Sea coast.
Once installed, the turbines are expected to be connected to the grid by the end of this year, with the deal marking the first time Siemens direct-drive turbines have been used in the region.
The machines, with a rotor diameter of 113 metres and hub height of 92.5 metres, are suited for medium- to low-wind sites.
Peter Spies, CEO of the site's developer Windpark Kniphagen, said the turbines were chosen because of their availability and energy efficiency.