The newly installed HelWin2 platform is located 3km north of the island, near the HelWin1 platform which Siemens erected in August 2013.

The company has already erected the BorWin2 platform off the coast of Borkum in April 2014.

Siemens is supplying a total of five North Sea links for German-Dutch grid operator TenneT, four of which are due to come online in the second half of 2014 and the first half of 2015, with a total capacity of more than 2.9GW.

The fifth connection, BorWin3, is expected to start operations in 2019.

Siemens CEO of the power transmission and smart grid divisions Jan Mrosik said the company has now installed three high-tech platforms for TenneT in the North Sea.

"The HelWin2 project is now in the homestretch to begin operation in the coming year," Mrosik added.

TenneT executive board member Lex Hartman said, "We have achieved one more major interim milestone, and are step by step accomplishing the German government’s offshore expansion goals."

Heerema constructed and installed the HelWin2 offshore converter station, which will have a 690MW transmission capacity, enough to power more than 500,000 homes in Germany.

Prysmian supplied the marine and land-based cabling for the HelWin2 platform.

Image: The HelWin2 grid connection will transmit offshore-generated wind power to land for about 700,000 households in Germany. Photo: Courtesy of Siemens.