Helgoland cable
OperationalIsland LinkDE5 MW30 kV53 km2009
Basic information
8 fieldsAlso Known As
Helgolandkabel · Heligoland Power Cable · Helgoland Power Cable · Stromkabel nach Helgoland
Status
operational
Capacity
5 MW
Project Company
Type
island link
Expected Life
40 years
Website
Supply Chain (1)
Project Timeline (4)
30 Nov 2009Onss Commissioned
On 30 November 2009, the Helgoland cable connection between the onshore substation at St. Peter-Ording and the island of Helgoland was commissioned, linking the island to the mainland electricity grid. The 30 kV, roughly 52–53 km long submarine cable, with around 5 MW capacity and costing about EUR 20 million, began supplying Helgoland’s approximately 1,300 residents, replacing local diesel generators which were retained only as reserve units and thereby improving supply security and environmental performance.
1 Sept 2009Commercial Operations Full Power
The Helgoland cable, a 30 kV AC subsea power cable built by Norddeutsche Seekabelwerke for utility E.ON Hanse to supply the island of Helgoland from St. Peter-Ording, entered full commercial operation in September 2009, when all connections were completed and Helgoland was connected to the European interconnected power system, replacing its previous diesel-based electricity supply. The project’s subsea cable, which also incorporates fibre-optic elements for data transmission, has operated since then as the island’s grid connection to the continental network.
18 Jun 2009Cable Installation Complete
The offshore installation of the Helgolandkabel subsea power cable was completed in June 2009, when the cable‑lay vessel Nostag 10, having started work from St. Peter‑Ording on 6 June 2009, reached Helgoland after 12 days of laying the approximately 53‑kilometre cable, which was buried about 1.5 metres into the sandy seabed.
6 Jun 2009Cable Installation Start
Cable installation for the Helgoland cable began on 6 June 2009, when the cable-laying vessel Nostag 10 started work from St. Peter-Ording after multiple weather-related postponements. The vessel proceeded to lay the 30 kV subsea power and data cable towards Helgoland, installing it by jetting it approximately 1.5 metres into the sandy seabed.