Solution provider
We provide state-of-the-art services within engineering, environmental science and economics with due consideration for the environment and society.
Case
Offshore wind
Wind farm planning and development
Offshore transformer platform in the Baltic Sea – Red Sand II
3. April 2009
Want to see this solution first hand?
Add the case to your visit request and let us know that you are interested in visiting Denmark
The public-owned company Energinet.dk, which owns the infrastructure for the supply of electricity and gas in Denmark, has awarded COWI the contract to design a transformer platform to be located in the Baltic Sea a couple of kilometres offshore of south eastern Denmark.
The platform will be placed at a depth of six metres on a so-called "gravity-based" foundation, which retains its stability on the sea bed in all weather conditions by virtue of its own weight.
Red Sand II
The new windmill park Red Sand II will comprise 80 offshore wind turbines with a total output of 200 MW, enough to supply 200,000 households for a whole year.
The transformer platform will collect electricity from these wind turbines and transform it from 33 kV to 132 kV for transferral via a powerful marine subsea cable to the shore, benefiting domestic consumers and companies alike.
COWI’s services
COWI designs the platform topside and its concrete foundation. The platform itself houses the main transformer with associated cables and panels, internal power supply, an emergency generator, a fire-fighting unit, a workshop and monitoring and control system. The whole operation will be controlled and monitored from the shore.
The platform topside weights approximately 800 tonnes, not counting its concrete foundation. The transformer alone weighs 280 tonnes. The ground plan will be 30 m x 16 m.
