Technology group Wärtsilä has been selected by Gramme Storage 1 to supply a 50 MW / 100 MWh battery energy storage system (BESS) in central-eastern Belgium. The project, known as Gramme 1, will support the country’s transition toward a more sustainable, efficient and renewable-based power system.
Construction work on the site is currently underway, and the project is expected to be completed by the second quarter of 2027. The order for the project was booked in the second quarter of 2025.
“This project with Wärtsilä underscores our commitment to dependable, flexible energy in Belgium”, said Guillaume Poncelet, Managing Director at Kallima Energies – the Liège-based developer of the project. “This collaboration highlights the growing role of battery energy storage in supporting Belgium’s electricity system. By delivering essential ancillary services, the system will play a vital role in balancing the grid.”
First Participation in Belgium’s Capacity Remuneration Mechanism
Gramme 1 marks Wärtsilä’s first energy storage project to participate in Belgium’s Capacity Remuneration Mechanism (CRM). The CRM framework is designed to secure the country’s electricity supply by enabling energy assets to provide essential grid services. These services include frequency and voltage support, which help improve system reliability and resilience.
“This project in partnership with Gramme Storage 1 reflects our shared focus on supporting Belgium’s energy security and grid stability during the transition to a more renewable power system,” said David Hebert, Vice President of Global Sales Management, Wärtsilä Energy Storage. “Wärtsilä’s advanced technology will enable the site to provide critical ancillary services that support a resilient, future-ready grid.”
Advanced Technology and Long-Term Service Support
The Gramme 1 facility will use Wärtsilä’s GridSolve™ Quantum2 energy storage system along with its GEMS control and optimisation software. Together, these technologies will deliver a fully integrated, standalone solution aimed at improving grid flexibility, reliability and sustainability.
Wärtsilä will execute the project under an engineered equipment delivery (EEQ) contract. The agreement also includes a separate long-term service contract that guarantees asset performance.
With the addition of Gramme 1, Wärtsilä’s total installed and contracted energy storage capacity in Europe now exceeds 2.7 GWh.
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