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<p>was commissioned.Installation and service / maintenance of off-shore wind farms are a challenge for technology and economic operation of a wind farm. as of 2015, there are 20 <a href="page.php?w=Jackup_rig">jackup vessels</a> for lifting components, but few can lift sizes above 5 MW. Service vessels have to be operated nearly 24/7 (availability higher than 80% of time) to get sufficient amortisation from the wind turbines. Therefore, special fast service vehicles for installation (like Wind Turbine Shuttle) as well as for maintenance (including</p><p>
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