To reach climate goals, we need more wind farms with bigger turbines. If it is up to Tetrahedron, their super crane will certainly help things move forward. How? ‘With a crane that lifts higher than a regular crane while fitting on the same size base. So it’s a matter of simply lifting higher,’ says Wilco Stavenuiter, Director of Rotterdam-based Tetrahedron.

Wind turbines are getting bigger and bigger, so we needed a new design of crane using a new technique to install them, which gave Stavenuiter the idea for a super crane. Tetrahedron engineers are working hard to construct a unique, novel type of crane for the offshore wind industry. The key lies in the shape: a triangle-based pyramid; in other words a tetrahedron. The tetrahedron is a strong shape for construction.

Stavenuiter: ‘If you have a look around you at the port, you’ll see cranes standing about 50 metres tall. Our crane will be much taller and will be able to reach up to 130 metres to install the very latest offshore wind turbines. The unique thing about our crane is that we have moved the pivot point from the bottom to the top. What makes it so special is that it does not need more lateral reach; instead, it can reach much higher. That extra height is exactly what the offshore wind industry needs, as wind turbines are getting taller and taller. It will mean engineers can install and maintain large wind turbines. The technology is also suitable for even taller turbines.’

Also read: Tetrahedron wins award for new offshore wind crane

Solution for existing vessels as well

In addition to newbuilds, the crane is also suitable for existing installation vessels. As Stavenuiter explains, the ‘technology will allow us to upgrade existing vessels currently in use in the oil and gas industry. Using our cranes, they can be adapted so they can be deployed for wind power. Repurposing the vessels ensures they will last for decades to come. So it’s doubly sustainable.’

Also read: New Tetrahedron crane can increase lift capacity of existing jack-ups


It sounds simple: moving the pivot point, but a lot of calculations, drawings, talks with companies in the industry and thinking went into it.

Stavenuiter: ‘Following an in-depth and creative process, we reached a point where we knew “this is it”. We applied for and were granted a patent for our crane design. Together with a consortium of investors, we will construct a prototype of the crane. All parts of the crane are Dutch built and the crane will be assembled in the Netherlands too. Who knows, maybe the work will be carried out here, at RDM in Rotterdam Heijplaat. Heijplaat is where I live, so how fantastic would it be to look out of my kitchen window in the near future and watch the crane rise upwards?’

He adds: ‘We expect the prototype to be ready by 2024. We are very excited about building it. Firstly, it will allow us to demonstrate that the crane can lift loads to a height of 130 metres. Secondly, we need to prove that we can scale up the technology so that the crane can reach up to 200 metres. As an indication of just how tall that is: the height of the Euromast is 185 metres.’

Logical choice

Rotterdam was a logical choice for Stavenuiter and his company. ‘With Delft University of Technology nearby and the neighbouring Rotterdam University of Applied Sciences, there is a lot of interest from people who want to work for us. In addition, Rotterdam has a network of suppliers able to help construct such a large crane. And finally, it is imperative that we are here, because the port can accommodate the huge wind installation vessels onto which the crane will be fitted.’

Watch a video about Tetrahedron’s super crane below.

Also read: Dutch start-up designs crane to reach largest offshore wind turbines

Source: Port of Rotterdam. Picture: video still.