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Wärtsilä is constructing a 50 MW / 100 MWh battery energy storage system for Gramme Storage 1 in central-eastern Belgium, with completion expected by Q2 2027. This project supports Belgium's transition to a sustainable energy system and is part of the Capacity Remuneration Mechanism, ensuring energy supply security and grid resilience.

Wärtsilä will utilize its GridSolveTM Quantum2 system and GEMS software for this project, which is part of a broader energy storage portfolio exceeding 2.7 GWh in Europe. The order was finalized in Q2 2025.