What drives us

We deliver customised, efficient, and affordable core kits to the global wind power industry, but that is not all: Through independent and flexible collaboration, we help our clients look beyond the apparent opportunities of today and towards a simple global supply chain.

Our business model is agile, independent, and fully transparent in terms of material- and kitting costs, which allow our clients to make the right decisions regarding sub-suppliers, core materials, specifications, and requirements. No matter the specific need, our engineers are ready to go through the iterations of prototyping and testing necessary to deliver a quality kit.

For us, a core kit is not just yet another component - it is what we do and what we know. For more than 30 years we have been supplying core kits to the industry, which has allowed us to effectively adapt every single part of the involved processes to maximise the output.

From our custom machinery to the location of our production and storage facilities, we empower performance – of material, of kits, of turbines, and of the industry. By choosing JSB as your kitting partner, you get a global ally driven by continuous improvement, flexibility, and transparency.


Your global core kit partner

Our production sites are placed strategically at the centre of several wind blade production clusters. Our global sites are in constant dialogue with each other through weekly meetings and a constant eye on performance indicators and best practices. We do this to ensure that all of our products adhere to our own high standards.

Allentown, USA
Falces, Spain
Ringkøbing, Denmark
Izmir, Turkey
Zhuozhou, China
Dafeng, China

Our history



JSB is founded by Jens Sivert Bak


Vestas is the first customer

Growth with Vestas


Development of endless sheet technology and patent

Customer diversification and internationalisation


LM Wind Power decides to outsource their kitting and JSB becomes the primary supplier


Windkits in the US is established as JV


Siemens close down all in-house kitting and JSB is appointed as the primary supplier


Production site in Zhuozhou (CN) established. Site primarily serves Vestas and Siemens


Wind Group, comprising Jupiter Group, JSB Group and Polytech is acquired by Pentaco Partners


Acquisition of Windkits (former JV)

Global consolidation


Jens Sivert Bak steps down and new CEO, Frank V. Nielsen is appointed


Expansion of customer base to include Nordex and TPI


Verdan Capital acquires Wind Group comprised of JSB, Polytech, and Jupiter


Opening of second Chinese production site, Dafeng (CN)


Acquisition of MEP, a Spain-based competitor to JSB


Opening of Turkey production site, Izmir (TU)

Meet the management

Developing from a one-man operation to a 470+ one has been an exciting journey, and has shaped a humble yet passionate culture that we are proud of. At JSB, we are a diverse, international group of people with vastly different backgrounds, areas of expertise, and daily responsibilities.

What we have in common, however, is a passion for empowering our clients’ performance through the products and services that we provide. We know that the success of JSB, historically and in the future, is a result of an inclusive  and supportive environment that disregards national borders, job descriptions, and whether your daily job places you at a desk, on the road, or in the production hall.

Our management team draws their knowledge from vast experience of working in the industry. Each core kitting project is handled by a dedicated business manager within our company.

Johan Gralén

Johan takes his experience from over a decade of working for core kit manufacturer Diab.

Frank V. Nielsen

Prior to joining JSB in 2014, Frank acted as CTO at LM Wind Power after working for Vestas for 10 years.

Per Olesen

After eight years with one of our largest customers, Vestas, Per joined us in 2017

Andreas Kipker

Starting his career at JSB as a controller, Andreas has climbed the career ladder within our company.

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