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Exasun teams up with Wienerberger

Dutch scale-up Exasun, manufacturer of innovative in-roof solar solutions, is to forge a strategic partnership with Wienerberger, the world’s largest producer of ceramic construction and paving materials. Wienerberger will handle the exclusive pan-European sales and distribution of Exasun’s high-performance X-Tile and X-Roof solar panels. The partnership ties in with Exasun’s and the EU’s wide-ranging ambitions to make the built environment more sustainable and accelerate the energy transition.

from left to right: Remon Veraart (CEO Exasun), Jan-Jaap van Os (CTO & Co-Founder Exasun), Bert Jan Koekoek (Managing Director Wienerberger)

Exasun has been a portfolio company of ENERGIIQ, the energy innovation fund of regional development agency InnovationQuarter since 2018. By investing in Exasun, ENERGIIQ aims to stimulate the reshoring of solar panel production to the Netherlands, thereby contributing to a further reduction in CO2 emissions. This strategy will also serve to develop home-grown knowledge of solar panel recycling and its potential. Exasun’s in-roof photovoltaic (PV) systems will be integral to the energy solutions provided by Wienerberger.

Aside from ENERGIIQ, other parties have also invested in Exasun in the past three years, including No Such Ventures and Dockpoint. Thanks in part to the support of these co-investors, the scale-up is now an appealing partner for major market players like Wienerberger. In the next growth phase, Exasun will raise additional capital to further increase production.

Accelerating the energy transition

The strategic partnership, slated to start on 1 January 2022, is based on Wienerberger managing the exclusive pan-European sales and distribution of Exasun’s X-Tile and X-Roof building integrated photovoltaics (BIPV) systems. Unlike traditional solar panels, which are installed on top of existing roofing, these innovative systems also double as roofing material.

The partnership will provide a major boost to the availability of BIPV systems for the building industry and will enable Exasun to contribute to accelerating the energy transition across Europe. This represents the first step in the company’s global strategy that includes expanding into other regions to open up opportunities for further development of the product portfolio.

Schoemaker Plantage Delft X-Roof

Exasun’s X-Roof | Schoemaker Plantage Delft

Market leader in the Netherlands

Exasun has been the Dutch market leader for BIPV systems for several years. Its products are regarded as the next generation of solar solutions and are widely used in single-unit and multi-unit residential construction. Contractors, developers and architects increasingly use the systems to achieve an aesthetically high-quality roof finish that is both watertight and energy generating at a competitive price. Exasun’s systems have European IEC certification and comply with all relevant building materials regulations.

Project: Park van Buijsen, Pijnacker | Product: X-Roof Black

Previous collaboration

Exasun has previously collaborated with Wienerberger on developing the X‑Tile – a solar roof panel that integrates perfectly with the building material manufacturer’s flat ceramic roof tile, Actua 10. However, Exasun’s X-Roof is now taking things a step further: an integrated solution where the entire roof consists of in-roof solar panels. Here, too, a combination with regular roof tiles is possible. X-Roof has an exceptionally favourable life cycle analysis (LCA) score and lifespan compared to other systems on the market. It is also listed in the Dutch Environmental Database, which is gaining increasing importance in the building industry.

Logical step for Wienerberger

Wienerberger has a rich history in sustainable entrepreneurship. Its innovative solar energy solutions are key to its far-reaching ambitions to create a sustainable future. At the same time, the company’s growth strategy is aimed at offering a wider portfolio of materials and solutions for building envelopes and infrastructure. Establishing a strategic partnership with Exasun is therefore a logical step.


About Exasun

Exasun is an innovative Dutch manufacturer of affordable and aesthetic, top-quality glass-glass solar panels that are highly efficient and extremely durable. Exasun’s technology is distinguished by a much better score in terms of environmental requirements than traditional solar panels. Based in The Hague, the scale-up has developed its advanced production line in close collaboration with suppliers, knowledge institutions and renowned Dutch machine builders. In addition to innovative BIPV panels for watertight PV roofs (X-Roof), Exasun also makes panels that can be integrated with roof tiles (X-Tile). A patented colour technology ensures optimal, seamless integration of both systems with new and existing roofs.

About Wienerberger Group

The Wienerberger Group is a leading international provider of smart solutions for the entire building envelope and infrastructure. Wienerberger is the world’s largest producer of bricks (Porotherm, Terca). It is the market leader in clay roof tiles (Koramic, Tondach) in Europe and concrete pavers (Semmelrock) in Eastern Europe. The company is also one of the continent’s leading suppliers of pipe systems (Steinzeug-Keramo ceramic pipes and Pipelife plastic pipes). With 197 production sites, the Wienerberger Group generated revenues of €3.4 billion in 2020.


ENERGIIQ is the energy innovation fund of the Province of South Holland and is administered by InnovationQuarter. The Province of South Holland has earmarked €35 million for ENERGIIQ, which invests in businesses that are ready to commercialise a proven energy innovation. Innovations should lead to a reduction in CO2 emissions and/or the creation of jobs in West Holland.

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Jesse In ‘t Velt

Senior Investment Manager ENERGIIQ