Tractebel helps ENGIE build its second large-scale battery park in Belgium, contributing to shaping a flexible, reliable and sustainable energy system in the country.
The construction of ENGIE’s newest battery storage facility was officially launched in Kallo, Belgium, on 13 May in the presence of Federal Energy Minister Mathieu Bihet, Beveren Mayor Marc Van de Vijver, and ENGIE Belgium CEO Vincent Verbeke. Once operational in spring 2027, the facility will provide 400 MWh of storage capacity, enough to power over 48,000 homes for four hours.
Picture: ground-breaking ceremony (copyright: ENGIE)
Owner's Engineer role
Since the beginning of the project, Tractebel has served as Owner’s Engineer for this landmark project, reinforcing its commitment to accelerating the energy transition. Tractebel brings its multidisciplinary expertise to oversee the project’s technical design, construction, and commissioning phases. After assisting with the basic design and tender documents' completion, our engineers, who work within ENGIE’s integrated team, are now providing technical assistance, studies and supervising the detailed design, construction, and commissioning phases. Our team ensures the facility meets the highest safety, performance, and sustainability standards.
Picture: 3D view of the battery energy storage system project in Kallo, Belgium (copyright: ENGIE)
Enhancing grid flexibility
Spread across nearly two hectares, the Kallo site will host 110 battery modules capable of delivering 100 MW of power to the grid. This project is the second largest of ENGIE’s battery park projects, after the Vilvorde site (200 MW). Battery storage is a cornerstone of ENGIE’s strategy to enhance grid flexibility and integrate renewable energy sources. By storing excess wind and solar power and releasing it when needed, the Kallo facility will help balance supply and demand, ensuring a more stable and resilient electricity network.
 |
"This project is a perfect example of how Tractebel's engineering expertise can provide optimised solutions that help clients reduce CAPEX deliver their sustainable projects on time. On very short notice, Tractebel prepared all technical documentation and specifications for the calls for tenders." |
| Johan Baert, Technical Advisor BESS & Grid Connection, Tractebel |
 |
“ The project is now on track to meet its objectives to connect to the grid by spring 2027, thanks to the excellent collaboration between ENGIE and Tractebel.We are proud to contribute to the construction of a facility that will play a vital role in Belgium’s carbon-neutral future." |
| Zohra M'Talssi, Project Manager, Tractebel |
Our Urban teams from France and Monaco are leading the design and construction supervision of the Mediterranean Pavilion, ahead of the third United Nations Ocean...
Find out more
Our transport infrastructure experts signed a mandate on April 25, 2025, to provide technical services on the first metro project in the Western Balkans. This is our...
Find out more
For 11 years, our nuclear experts have contributed to the International Thermonuclear Experimental Reactor (ITER), a groundbreaking energy project involving 35 countries...
Find out more
On World Engineering Day 2025 dedicated to “Shaping our Sustainable Future through Engineering”, we caught up with Natalia CAMPOS DELGADO, Project Manager, who works on one...
Find out more