Belfius: substantial energy savings thanks to BMS & OptimiZ
10 April 2025Belfius: substantial energy savings thanks to BMS & OptimiZ
10 April 2025
Equans reduces energy consumption at Rogier Tower by around 40%
Equans is actively contributing to the energy transition at Rogier Tower, the headquarters of Belfius, through the installation of an intelligent Building Management System (BMS), combined with our OptimiZ detection system for irregularities. The iconic 140-metre-high, 38-storey skyscraper in Brussels' North Quarter has been the workplace of our technical maintenance and energy management experts for more than 20 years.
Some key figures
How to save (even) more energy?
What began as a traditional maintenance assignment developed into an in-depth collaboration focused on sustainable building management and energy savings. The installation of charging points for electric vehicles, the lighting of the “black room” for the art gallery, the maintenance of the sun blinds on the 6,000 windows, HVAC, sanitary installations, sprinklers, lighting... in a building with almost 93,000 m² of office space, there is no shortage of projects. Our colleagues are jacks of all trades.
Belfius wanted to go one step further in terms of energy savings. In a glass building with critical environments, such as a market hall and areas with cash machines, not everything was straightforward.
Jean-Jacques Montignie, Operation Manager at Equans
BMS & OptimiZ, a winning combination
“We suggested that Belfius install a Building Management System (BMS). This smart technology makes it possible to continuously monitor, analyse and optimise the building's energy consumption.”
In the past, the outside temperature determined when the boilers or cooling systems were activated. Thanks to the controllers we have installed, it is now the temperature in the offices that controls the heating or cooling. The BMS is combined with Optimiz, a detection system developed by Equans that can detect even the smallest faults in the installation. A leaking tap? An abnormal temperature sensor? From now on, we can detect all faults immediately.
Up to 40% less gas and electricity
“We are delighted that Belfius was immediately convinced by the solutions we proposed. Thanks to this project, we have been able to reduce the annual consumption of gas and electricity for cooling installations by around 40%.
By including daily energy quotas in the BMS, you don't have to wait a year to get an overview of consumption. We can monitor energy consumption on a daily basis and immediately identify any excessive consumption. This means that our cost-saving measures can also be measured very quickly."
Frequently asked questions about building management systems
Do you have questions about building management systems? We are happy to help you by explaining everything clearly and simply.
Do you still have questions? Our experts are happy to help you.
A BMS is an intelligent system that centrally monitors, analyses and controls all technical installations in a building. This allows HVAC installations, cooling, lighting and other systems to function more efficiently. With a well-configured BMS, you can drastically reduce your energy consumption and make your building much more comfortable for its users.
OptimiZ is an advanced detection system from Equans that quickly detects minor deviations and malfunctions, even when they remain invisible in a traditional BMS. Examples include a quietly leaking tap or a temperature sensor that measures incorrectly. By immediately identifying problems, you prevent energy loss and unexpected costs.
Read more about OptimiZ
The combination of BMS and OptimiZ demonstrably leads to significant energy savings. In projects such as the Rogier Tower, Equans was able to reduce annual gas and electricity consumption by approximately 40%. Thanks to daily quotas and real-time monitoring, any exceedances are immediately visible, allowing you to make adjustments more quickly.
We can integrate or optimise a BMS in virtually any type of building. OptimiZ also works on existing systems and can therefore be deployed without the need for complete modernisation. Whether it's an office tower, a hospital, an industrial site or a building with critical environments, Equans has experience with complex infrastructures and offers tailor-made solutions.
No, that is not necessarily the case. Equans can take care of the entire management process. Our experts monitor consumption, analyse deviations and suggest improvements. OptimiZ automatically detects problems, allowing us to take immediate action. You receive clear reports and complete peace of mind.
By eliminating energy leaks, optimising HVAC settings and automatically detecting faults, you will often see a noticeable reduction in energy consumption after just a few months.
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