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RWE Innogy GmbH:
Installation of the foundations for the
Nordsee Ost offshore wind farm completed
49 jacket
foundations successfully installed
"Victoria Mathias“ installation vessel being converted in
Cuxhaven
Turbine installation due to start in May
March 14, 2014 + + + All foundations of the Nordsee Ost
offshore wind farm have been successfully installed some 35 kilometres
north of the island of Heligoland. A total of 48 jacket foundations were
installed for the wind turbines and one for the substation in water up to
25 metres deep.
Each of the foundations for the wind turbines is
approx. 50 metres high with a weight of some 550 tons. The heavy-duty
crane of RWE's own installation vessel "Victoria Mathias“ placed the
foundations on the sea bed and then anchored them firmly with foundation
piles with a length of some 50 metres and a weight of more than 100 tons.
The jacket foundations were manufactured by the company Kvaerner in
Verdal, Norway, and transported by pontoons to the Nordsee Ost base port
at Bremerhaven. Once there, two foundation structures at a time were
loaded with the associated eight foundation piles onto the installation
vessel and taken to the construction site at sea.
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Driving of foundation piles
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Loading of the nacelles
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"With the successful completion of all foundations we have reached an
important milestone and demonstrated that our logistics chain has been
working exceptionally well", emphasised Marcel Sunier, project director
for the Nordsee Ost wind farm at RWE Innogy. "Starting in May, we intend
to begin with the installation of the wind turbines, followed by the
substation at sea in the summer. All the facilities are due to be
connected to the grid by spring 2015."
A total of 48 wind turbines of the 6-megawatt class are being erected
across some 24 square kilometres for the Nordsee Ost wind farm. The total
weight carried by each individual foundation amounts to some 700 tons. The
key components of the wind power systems are already stored in the base
port at Bremerhaven. This includes, for instance, the rotor blades with a
length of over 60 metres, the steel towers of the turbines weighing over
240 tons and the nacelles with the size of a single-family home. The
"Victoria Mathias“ installation vessel is currently being converted in the
Mützelfeldt shipyard at Cuxhaven so that it can accommodate these huge
components: To this end, the transportation frames for the foundations are
being removed from the ship's deck and replaced by appropriate transport
restraint systems for the wind tubrines. The "Victoria Mathias“ is due to
leave the port for the first time with tower segments and nacelles on
board in May. Moreover, its sister vessel "Friedrich Ernestine“, which is
currently still erecting Gwynt y Môr offshore wind farm off the Welsh
coast, will help installing the turbines starting in the summer.
Once complete, the Nordsee Ost offshore wind farm will have an installed
capacity of some 295 MW and supply the equivalent of some 300,000
residential households per year with electricity. Equipped with the
currently most powerful offshore turbines, Nordsee Ost ranks among the
largest commercial wind power projects off the German coast.
Source: Barbara Woydtke
RWE Innogy
- www.rwe.com
See also:
www.rwenordseeost.com
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