TenneT is seeking companies to carry out geophysical and geotechnical surveys during development and construction of various platforms and cable links off the Netherlands.
However, the scope may also include sites covered by TenneT off the coast of Germany, and, if the agreement is extended beyond the initial three years, could cover operational connections.
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Further agreements will be awarded by means of mini-competitions, for which qualified consultants holding a framework agreement will be invited, the tender document said.
The contract is valued at €150m for the initial three years, with options to renew for five 12 month periods.
Interested parties have until 12.15pm local time on 21 April to apply.