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Minelco Supplies MagnaDense for Offshore Windfarm

Minelco is supplying ~23,000mt of MagnaDense, our high density, ballasting material to a large scale wind farm project in Sweden.

The E-On Vind AB owned project, named ’Kårehamn Windfarm’  is being built in the Baltic Sea just outside of Kårehamn South East Coast of Sweden and is due to become operational in 2013.

At a cost of around €120 million, the largest project of its kind in Sweden, it will make use of 16 (3MW V112) turbines and have a capacity of 48 megawatt (MW), generating 180GWh of renewable electricity per year.

Due to the soil conditions impeding the use of piles, concrete gravity base foundations ranging from 15-25m wide and weighing up to 1,950 tonnes each, were chosen to anchor the turbines to the seabed.

Design, construction and installation has been awarded to Belgium contractor Jan De Nul who are working with Minelco to ensure the foundation’s requirements are met through their design and our heavy weight and reliable product MagnaDenseTM.  

Minelco’s  high grade aggregate, manufactured from the natural iron oxide mineral Magnetite, will be used as ballast material to weigh down the concrete gravity bases, ensuring that the offshore wind turbines are securely fixed to the seabed and can withstand decades of ocean currents and erosion.

MagnaDenseTM has a specific density of 4.8 – 5.1 t/m3, and is the perfect material to use for ballasting in offshore applications either as a loose ballast, as was the case in the Kårehamn project where a loose bulk density of 3.0 t/m3 was stipulated, or for heavy concrete where benefits can be seen in cheaper logistics and less reinforcement.  MagnaDenseTM is sustainable in offshore projects as it is totally inert offering stability and a long underwater lifetime due to lack of reactivity to seawater

MagnaDenseTM has a CE certification and is a consistent product approved to EN12620.  Less cement is required in concrete to achieve a density up to 4.0t/m3 and less volume when loose ballasting for a given weight all offering benefits to the environment and enforcing the sustainability of Minelco’s product MagnaDenseTM.

These foundations need to have a considerable weight in order to withstand the freezing conditions, motions of the sea and the stresses imposed by the rotating blades. Minelco is proud to be producing and supplying this project with a material that retains an increased weight for ballasting for such large scale and technical machinery.