PNE became WKN's majority shareholder in April when it acquired 53.42% of the company's shares from Volker Friedrichsen Beteiligungs-GmbH.
It is paying Siemens approximately €27 million in cash, the price based on a company valuation of around €93 million for 100% of WKN shares.
WKN, which has 1.1GW of fully developed wind projects and another 1.7GW in the pipeline, will continue to operate under its existing name.
