Rather than using smaller vessels or helicopters to access the turbines, the new vessels will provide direct access using a hydraulic gangway system.
The vessels will also include accommodation for more than 30 technicians for several weeks at a time.
Siemens Service Renewables CEO Tim Holt said: "This new, state-of-the-art design concept has been developed with a strong focus on advancing and streamlining our offshore service operations and logistics for the benefit of our customers."