Primus Energie will develop the pipeline, which consists of 23 sites at different stages of development, as a service provider for Innogy.
Both parties have agreed to keep the purchase price and the projects involved in the transaction confidential, the companies added.
A project list on Primus Energie’s website lists sites with capacities ranging from 2.3MW to 24MW.
Innogy CEO Hans Bünting said: "We want to develop wind energy and enhance our portfolio in our home market, as well.
"To do so, we are looking selectively for co-operations with other project developers."
Jürgen Meyer-Menz, managing director of Primus Energie added: "To be able to develop projects successfully even during turbulent times, we have brought in Innogy as an extremely experienced, financially strong wind all-rounder."