Innogy and Primus Group are to work together on the development of solar projects, as well as onshore wind farms, in Germany.
As part of the agreement, Innogy will take over photovoltaic projects over 50MW in Thuringia and Bavaria in Germany.
Primus will further develop solar plants for Innogy as a service provider, with the project rights fully transferred to the latter.
A total of six solar farms are in the pipeline at various stages of development, with a 10MW project at the most advanced stage and could participate in an auction later this year.
Innogy subsidiary Belectric will construct and operate these plants.
Both parties have agreed to keep the purchase price and other contractual details confidential.
Innogy solar head Thorsten Blanke said: “Entering into specific cooperative agreements with other project developers is part of our growth strategy.
“We have already worked with Primus in developing onshore wind power plants. We are now set to extend this cooperative relationship to the area of photovoltaics.
“Primus is a highly professional development partner that is well-established in the region.
“Together with our subsidiary Belectric, we will bring our technical expertise from the area of solar energy to the table, which will be necessary in order to hold our ground in a competitive market like Germany.”
Primus Energie managing director Jurgen Meyer-Menz said: “For more than a year now, we have a promising cooperation in the field of wind power.
“We complement the outstanding market position of Innogy with the advantages of a flexible and highly specialised medium-sized developer.
“What could be more appropriate than to use this recipe for success in the field of photovoltaics.
“In particular, we are looking forward to working with the highly experienced and successful colleagues of Innogy and Belectric.”
Innogy is also planning to build some smaller PV projects with capacity of 750kW. The first, located in the municipality of Lembruch in Lower Saxony, came online last year.
A second 750kW plant is being built near Osnabruck in Lower Saxony and a third is planned for near Stolberg in North Rhine-Westphalia.