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Company profile

Founded in 1948, Sif, is a company with a solid track record. From a purely manufacturing company of large, thick tubular steel structures, the company has transitioned towards a total solution provider of offshore wind monopile foundations. Today Sif employs over 600 people (approximately 50% of whom are on the payroll) at two manufacturing sites in the Netherlands: Roermond and Maasvlakte 2, near Rotterdam. Sif is listed on Euronext Amsterdam since May 2016.

For 75 years we have been innovating and building the foundations of a sustainable future for future generations. Sif continues to develop products and services in order to continue to meet market demand. Wind farm developers can come to us for foundation design, fabrication, corrosion protection and logistics services such as storage and transshipment. With the recently announced expansion on Maasvlakte 2 and the associated advanced production processes and resources, we can make monopiles with a diameter of up to 11 metres. This means that the current annual production capacity of approximately 220 kilotonnes (approximately 1900 MW offshore wind energy capacity) in Europe will be increased to 500 kilotonnes (approximately 3000 MW offshore wind capacity) by 2025.

Sif is also taking important steps with regard to its own emissions. Since 2019, we have been generating our own green electricity with GE's Haliade-X wind turbine, which is located on our property, and we heat our welds with induction. Our production process is continuously optimized in terms of safety, efficiency, quality and impact on the environment.

In cooperation with customers, we are open and honest because we want to think along about solutions that ensure a more effective product and/or a more efficient process. We try to inform our customers at an early stage about the consequences of their (technical) choices regarding the resulting costs of the production or installation process.

Our employees are driven and focused on quality. Through teamwork, decisiveness and imagination, we ensure that we make an impact together. Sif offers a stimulating working environment with room for growth. Sif is continuously looking for highly qualified employees, suppliers and other business partners who share our vision: making an impact on the energy transition.

Sif is gradually becoming a “total solutions” partner that offers design engineering, high-end manufacturing and other related parts required for a complete latest generation monopile foundation including foundation, tower and turbine logistics and marshalling services

Fred van Beers (CEO)

Our mission

We want to be the best monopile solution provider through innovation, engineering and excellent manufacturing with commitment to the environment and our employees’ well-being, all as confirmed by our customers.

Our vision

Accelerate the growth of offshore wind power generation as a key driver of the world’s energy transition.

While Sif traditionally serves the North-Western European markets, we consider the offshore wind market as an increasingly global. Sif is gradually developing its global presence.



Sif delivers the 2000th monopile


Extension of 20 hectares at Maasvlakte 2 for marshalling and logistic services


Opening of the Tokyo sales office


Commissioning of a 12 MW GE Haliade-X turbine at the Sif terminal


Expanding to 42 hectares at Maasvlakte 2 – Rotterdam


Sif listed on the Euronext stock exchange


Strategy change: from pressure vessels to offshore foundations


Sif builds its first production halls and office in Roermond


Sif founded by Jan Jacob Schmeitz

Our core values


This means commitment
and responsibility. It begins with clarity about who does what and an open-minded attitude. We address each other in a solution-focused way about each person's part in the bigger picture.

Focus on results

That’s our way forward. Together we will brainstorm about the best approach to become even better today than yesterday. Sustainably and measurably.


Both internally and externally, Sif's team spirit is strong. We form an essential part of the larger chain that produces wind energy. Our desire to help each other based on a common, higher goal makes us rock solid.

Capacity Competences
Capacity & competences

Sif has two manufacturing facilities equipped with 47 Sif-designed welding machines and 8 rollers.

The Roermond plant, which covers more than 100,000 square metres, specializes in the manufacture of cans and cones, transition pieces, pin piles, legs and pile sleeves with a wall thickness of up to 160 mm.

People at Sif

Bart Theunissen

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Ralph Lacroix

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Michel Kurstjens

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Sif Roermond

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Sif Maasvlakte 2 Rotterdam

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