Decommissioning of turbines A1 and B1 of the
Rigg wind farm is currently
taking place following a recent Court of Appeal ruling between E.ON
Climate and Renewables UK and
MT Højgaard A/S
(MT). The MPI
ADVENTURE is on site and
the work is expected to take six weeks.
MT were contracted by E.ON to design and install Robin
Rigg's wind turbine foundations. Shortly
after the installation of said foundations, the grouted connections between
the monopile and foundation began to fail. Both companies agreed that working
together to find a solution would be mutually beneficial, however after
the work was carried out there was a dispute with regards to who should
bear the cost of the works. The cost of the works amounted to the significant
sum of €26.25 million.
As a result of this dispute MT
issued proceedings with the Techology and Construction
Court to settle who should bear the cost.
MT stated that it had complied
with its contractual obligations and should bear no
remedial costs. E.ON argued
that MT had breached a number of contractual provisions, in particular,
those set out in the Technical Requirements. MT
was also obliged to construct the foundations in accordance with J101,
an international standard for the design of offshore wind turbines. However
it was revealed that there were errors within the calculations, which resulted
in the axial capacity being insufficient to resist the downward load from
The judge ruled that MT
were to be held responsible because the foundations
were not fit for purpose and this infringed the contractual obligations
set out by E.ON. MT
appealed this ruling and argued in the Court of Appeal
that the contract did not
outline a fitness for purpose obligation for the service life of the foundations.
There was only an obligation for the foundations to have a 20-year design
life. MT had complied with international standards for foundations, including
J101, and argued that the foundations had the required design life. In
return, E.ON contested the appeal and cross-appealed on the grounds that
MT breached two further conditions of the contract.
The Court of appeal found that MT were not to be held liable for the remedial
The 140 metre MPI
ADVENTURE arrived at the site on 2 October,
ready to decommission turbines A1 and B1, reducing the number of
plants in the array from 58 to 56. Suspected reasoning behind the decommissioning
is thought to be that they have damaged the bedrock beyond possible
Rigg offshore wind farm consisted of 58
Vestas V90-3.0 turbines, with a rated power of 3MW which gave the wind
farm a total capacity of 174MW. The reduction in the two turbines will
reduce the wind farm's capacity to 168MW.
For more information about the Robin
Rigg offshore wind farm or the MPI
ADVENTURE please follow the links provided.
Alternatively you can view the project on our interactive
MPI Adventure installing turbine blades at E.ON's Amrumbank
West Offshore Wind Farm.