The independent service provider will support utility Varberg Energi's nine projects for ten years.
It is Deutsche Windtechnik's third service contract in Sweden since setting up an office there in September 2016, however it is the company's first full-service contract in the country.
"In contrast to manufacturers, our expertise is not limited to one type of turbine. We can provide services for different technologies. Utilities with mixed turbine portfolios greatly benefit from this.
"You only need to talk to one company with one counterpart, but you still receive high-quality full service," said Deutsche Windtechnik International CEO Lars Behrends.
The deal will see Deutsche Windtechnik service 23 Vestas V90 turbines and 7 Gamesa G90 turbines between about five and ten years old.
The service provider said it will look to continue growing in Sweden, adding seven members of staff there, including technician and administrative jobs.
In October 2016, Deutsche Windtechnik won an O&M contract to service ten Vestas V47 turbines for the Ventosum project in southern Sweden.