Nordex has placed a promissory note (Schuldscheindarlehen) worth €550m with national and international investors, a move that will widen the company's debt capital portfolio.
The group of investors include Bayerische Landesbank, BNP Paribas, Commerzbank, HSBC and UniCredit. Proceeds from the transaction will be primarily used to finance the acquisition of Acciona Windpower.
In October, Nordex reached an agreement to acquire Acciona for €366.4m and 16.1 million new Nordex shares valued at €26 each.
Acciona Windpower designs and produces 3MW and 1.5MW turbines for all wind classes, including the design and manufacture of rotor blades and towers.
It operates four production facilities across the US, Brazil and Spain, while a new factory is under construction in India.
Nordex CEO Lars Bondo Krogsgaard said: "Both Nordex and Acciona Windpower have demonstrated ability to grow at impressive pace in recent years, and in combining our business activities, we are laying a robust foundation for future profitable growth."
A portion of the proceeds will also be used to repay the corporate bond maturing in April, the company said.
The climate bond standard executive board confirmed that proceeds from the first 'green' Schuldschein were being used solely for purposes with a positive impact on climate and environmental protection.
UniCredit Bank Green Bond Origination head Antonio Keglevich said: "Thanks to the strong demand, it was possible to more than double the originally planned volume of the Schuldschein.
"In addition to its solid balance-sheet structure, Nordex's sustainable and stable business model met with great interest.
"This applies equally to conventional and ESG investors."
The bonded loan is being issued in tranches of three, five, seven and ten years with fixed or variable coupons.