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Energy Management in production

By 2020, the carbon footprint of the VELUX Group must be cut by 50% compared to the 2007 level. That is the ambitious goal of the VELUX Climate Strategy 2020. When reductions were calculated by the end of 2018, CO2 emissions had been reduced by more than 43% over the period 2007-18. 

One of the permanent initiatives that have brought substantial savings is the introduction of systematic Energy Management at all VELUX factories in Europe. The factories have held ISO 50001 certification for three years now, and the investment has paid back in more than one way. 

Energy Management helps VELUX factory save on the energy bill

Every day, thousands of VELUX windows leave the factory in Sonneborn, Germany. The window production is energy intensive, and although the wood chips from the window frame production can be used for heating and hot water, the power consumption of the plant is significant.  

In the quest to cut down energy consumption and CO2 emissions as part of the VELUX climate strategy, the Sonneborn plant was the first VELUX factory to implement the ISO 50001 energy management standard. Since implementation, the energy management has returned impressive results. 


Apart from implementing the procedures and tools required for ISO 50001 certification, we have first focused on finding the low-hanging fruits when it comes to energy waste at the factory. Standby and idling of our machinery during production stops is one of the areas, where we have been able to save a lot. Likewise, eliminating leaks in our compressed air systems and improving the chip extraction system has contributed substantial savings.”

Frank Gerloff, responsible for Energy Management at the Sonneborn factory.

All in all, six years of energy management at the Sonneborn factory has resulted in significant savings on the energy bill.  With a pay-back time of only one year, the implementation of the energy management system has turned out to be a sound business case and has come to stay not only at the Sonneborn factory, but at all VELUX European production sites.

Next steps at the Sonneborn factory comprise optimisation of the ventilation systems, heat recovery on compressors and replacement of compressed air supply, heat pumps and lighting to more energy efficient solutions. Furthermore, a new bio-boiler installation is in the pipeline to increase the on-site renewable energy production by utilising the wood chip waste at the factory.   

Energy Management pays back at Danish factory

At the Skærbæk plant in Denmark, the focus on Energy Management in 2018 paved the way for annual energy savings of close to 150.000 euro.

The factory’s energy review carried out in 2018 revealed that the bio-boiler fueled by wood chips from production had excess capacity, which could be used to heat up additional square meters. By laying new pipelines to supply storage and production areas, a substantial part of the gas used for heating could be replaced by renewable bio-mass.

After the extension, the bio-boiler covers 70% of the heating demand and saves 312 tonnes of CO2 every year. The savings on the energy bill paid back the investment after only 1.5 years. Since 99.5% of the wood used in VELUX products is certified, sustainable wood, the wood waste is considered a CO2 neutral and renewable energy source.