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European Countries Lead the


                           Way with Wind Power


                                                 by Peter Hildebrandt

         Many of the nations of Europe take wind power very seriously. As a result, they are
         at the cutting edge of technology as well as innovation in the tricky construction
         feats needed to build wind turbines. This includes construction in such challenging
         settings as out at sea. Wire rope cable, fittings, hooks, and synthetic slings are
         critical for the work of lifting and making sure wind turbine parts are positioned
         at exactly the right spot and at the precise angle required.



            ncredibly, wind power in Denmark   sion  system operator, Energinet.dk,   being a Gravity Based Structure (GBS)
            provides some 39 percent of Danish   was responsible  for  establishing  the   and a steel structure  (tender design).
         Idomestic electricity,  making  Den-  offshore substation, the export cable to   GBS solution to construction concerns
         mark a leading wind power country in   shore and the connection to the main   turned out to be the preferred solution
         the  world.  The  Danes  were  pioneers   high-voltage power grid on land.  as it combined the installation benefits
         in  developing commercial  wind  power   The detailed design for offshore sub-  of  a  floating  concrete  structure  with
         during the 1970s and today almost half   station for this offshore wind farm is   that of a steel structure on top. One of
         of  the wind  turbines  worldwide  are   one of the core elements in order to   the most significant benefits was that
         made by such Danish firms as Vestas   transform and transmit the energy   there was no need for heavy lift vessels
         and Siemens Wind Power.            from the wind turbines to the electrical   with the GBS solution.
           The Danish wind turbine industry is   grid on land. The three transformers at   A Detailed foundation design for 111
         the world’s largest and 90% of the wind   the Anholt substation change the volt-  wind turbines had to be worked out. In
         turbines manufactured in Denmark are   age level from the wind turbines of 33   less than three years the turbines had
         sold to international markets. In 2003,   kV to 220  kV before the electricity is   to be up and running – this was only
         the Danish manufacturers had a total   sent to the land-based connection point   one summer and two winters to build
         world market share of approximately   to the power transmission grid through   this  project.  The wind  farm is 20 km
         38%, generating a combined turnover   a 25 km subsea AC-cable.        long and five km long. The body of wa-
         of almost three billion Euros and main-  Ramboll Group  provided the com-  ter in which it is located, the Kattegat,
         taining over 20,000 people employed in   plete substation design, which includ-  contains water at depths of from 45 to
         the industry, from wind turbine facto-  ed both topside and substructure. The   60 feet (15 to 20 meters). But no one
         ries to maintenance and research.  design of the substructure  ended up                continued on page 28
           The development of wind power in
         Denmark  has  been  characterized  by
         a close collaboration between publicly
         financed research and industry in key
         areas  such  as  research  and develop-
         ment,  certification,  testing,  and  the
         preparation of standards.
           Denmark’s offshore wind farm, the
         Anholt Offshore  Wind Farm is Den-
         mark’s largest such wind farm. Lo-
         cated in the Kattegat Strait, Denmark
         this amazing project was completed in
         2013. The 400 MW farm is the world’s
         third largest offshore wind farm. In the
         Kattegat strait between  Jutland and
         the island of Anholt, the development
         produces energy equivalent to the an-
         nual energy consumption of 400,000
         households – some four percent of Den-
         mark’s total power consumption.
           A detailed design for an offshore sub-
         station had to be developed along with
         detailed foundation designs for the 111
         offshore wind turbines in the Kattegat
         Strait.  Environmental  and maritime
         safety studies were  done.  DONG  En-  Restricted space conditions at the site, the tight bends on the Nufenen Pass and the
         ergy was the developer and operator of   extremely tight time window were great challenges at this high Alpine building site and
         the wind farm. The  Danish  transmis-  called for the highest performance in logistics. Photo courtesy of SwissWinds Development GmbH
         26     Wire Rope News & Sling Technology   October 2017
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