Project: Westermeerwind (NL)
48 monopiles
5 diameters

XL monopiles

The first turbine foundation is in place at the 144MW Westermeerwind nearshore wind farm in the Netherlands. Sif produced the 35 meters long monopiles with a diameter of 5 meters. The monopiles weigh about 250 tonnes each.

Watch the video of Alldynamics how a monopile is installed (Allnamics has done PDA-measurements during the installation of monopiles): 

High quality product

Since the monopiles are placed in fresh water which may freeze, it is important that the monopiles can withstand harsh conditions. The specifications requires -60 degrees quality of the welds in the top post of the monopile. Read the recommendation from Van Oord here.


Van Oord and Mammoet are tackling the job and the installation of the first of 48 units in the IJsselmeer. The project will feature Siemens 3MW turbines sited between 500 and 1100 meters from the dikes of the Noordoostpolder.

First power

Depending on the weather, one foundation should be installed per day, said developer Westermeerwind BV. Piling takes two to three hours and is expected to take place mainly in March and April. Installation of the electrical cables in the IJsselmeer kicks off in May. First power is expected in late July or early August. The entire wind farm is targeted for completion by mid-February 2016.