TenneT has now begun commercial operations at the project, which is the second North Sea link Siemens delivered to the transmission operator after the 800MW BorWin2 connection earlier in 2015.
The 130km long HelWin1offshore platform, which connects the Nordsee Ost and Meerwind Süd/Ost wind farms, is located about 85km off the German coast, north-west of the island of Helgoland.
TenneT TSO board member Lex Hartman said: "With the completion of HelWin1, TenneT now provides around 2,000 MW of transmission capacity in the German North Sea.
"TenneT will therefore achieve a further milestone in terms of the offshore expansion targets of the German Federal Government. The capacity of HelWin1 corresponds to an output that is theoretically sufficient to supply around 700,000 private households in Germany."
A consortium of Siemens and Prysmian has secured a contract from TenneT in the summer of 2010 for the HelWin1 project.
Siemens is also undertaking five North Sea grid connection projects for TenneT.
The next two grid connections, namely 864MW Sylwin 1 and 690MW HelWin 2, are expected to start commercial operations in the first six months of 2015.
The fifth one, 900MW BorWin 3, is expected to become operational in 2019.
The grid connections will have a total transmission capacity of over 3.8GW, generating enough energy for about five million homes.
Image: The offshore platform of the HelWin1 grid connection is located about 85km off the German coast. Photo: Courtesy of Siemens.
