The news came as Dong gave the final go-ahead for the projects by approving the EUR 2.2 billion needed to construct the wind farms.
There had been doubts surrounding the projects, with the uncertainty concerning the German government's policy towards offshore wind threatening their development.
But Dong struck a positive note, with executive vice-president Samuel Leupold commenting: "We remain hopeful that the new German government will soon announce a viable support framework for the period post-2017.
"For an industry with project lifecycles of 30 years it is critically important to obtain visibility beyond 2017 in order to continue to innovate and mature the technology, bring down production costs, and make a substantial contribution to the German Energiewende."
Construction of both projects is expected to begin in the first half of 2015, with commissioning due in the second half of 2016. Siemens will install the turbines and provide servicing for five years.