The 385MW project consists of 60 Siemens Gamesa SWT-6.0-154 turbines installed 35km north-east of the island of Rügen in north-east Germany.
E.on was responsible for the construction activities. Project director Holger Matthiesen said: "The Arkona project has completed the installation of the wind turbines safely and extremely efficiently."
Arkona, formerly known as Arkona-Becken Südost, was awarded a construction permit in 2012.
It is E.on’s third and Equinor’s first German offshore wind farm.