Wärtsilä has begun construction of a 50MW/100 megawatt-hour battery energy storage facility in central-eastern Belgium for Gramme Storage 1.
The project, known as Gramme 1, aims to strengthen grid stability and support Belgium’s energy transition efforts.
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Construction began after the order was confirmed in the second quarter of 2025 (Q2 2025), with completion scheduled for Q2 2027.
The energy storage project will take part in Belgium’s Capacity Remuneration Mechanism (CRM), a government framework designed to maintain secure electricity supply by allowing assets to provide grid services such as frequency and voltage management.
The project will incorporate Wärtsilä’s GridSolve Quantum2 system and GEMS control software to deliver a fully integrated stand-alone solution.
Wärtsilä will deliver the project under an engineered equipment delivery contract and will guarantee asset performance through a separate long-term service agreement.
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By GlobalDataKallima Energies is serving as the project developer.
Kallima Energies managing director Guillaume Poncelet said: “This project with Wärtsilä underscores our commitment to dependable, flexible energy in Belgium.
“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.”
The new facility increases Wärtsilä’s total installed or contracted energy storage capacity in Europe to more than 2.7 gigawatt-hours.
Wärtsilä Energy Storage Global Sales Management vice-president David Hebert said: “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. Wärtsilä’s advanced technology will enable the site to provide critical ancillary services that support a resilient, future-ready grid.”
