Utility-scale energy storage systems provider NHOA Energy, together with ENGIE, has commenced construction on a 400 megawatt-hour (MWh) battery energy storage system (BESS) in Kallo, Beveren, Belgium.

The company will deliver the project to ENGIE under a supply contract and a long-term service agreement to enhance grid stability.

The development follows ENGIE’s selection in the fourth capacity remuneration mechanism (CRM) auction by the Belgian grid operator, Elia.

The CRM, established by the Belgian government, aims to mitigate the predicted shortfall in installed power capacity, which is partly due to the planned partial phase-out of Belgian nuclear plants in 2025.

The Kallo BESS project will play a pivotal role in the energy transition of the region.

The project represents a strategic repurposing of the former Kallo power plant site, which ceased operations in 2011 after previously running on natural gas and fuel oil.

The system will provide energy for up to four hours, meeting the needs of 48,000 households.

ENGIE Belgium CEO Vincent Verbeke stated: “It is with great pride that we are launching the construction of this battery park in Kallo, together with the Minister of Energy, the municipality and our valuable partners.

“This is ENGIE’s second large-scale park in Belgium, a project that can only be realised through close co-operation with all of them. By developing this additional flexible capacity, we are contributing to the optimal use of wind and solar energy and meeting the needs of the electricity grid.”

NHOA Energy will leverage its almost two decades of energy storage field experience, particularly in European power electronics and engineering, to ensure the performance, resilience and cybersecurity of the Kallo BESS.

NHOA Energy global managing director Lucie Kanius-Dujardin stated: “This partnership to support the Belgian grid operator, Elia, underscores the essential role of energy storage in enabling the transition toward a more sustainable and resilient energy system.”

In April 2025, NHOA Energy announced the commissioning of Blyth Battery, a 238.5MW/477MWh energy storage system in South Australia.