Wärtsilä begins construction of 50 MW energy storage system in Belgium

Through the Gramme 1 project, Wärtsilä and Gramme Storage 1 will support Belgium’s transition towards a more sustainable and efficient renewable energy system. Construction is now underway and the site is expected to be completed by 2Q27. The order was booked in 2Q25.

Guillaume Poncelet, Managing Director at Kallima Energies, the Liège-based developer of the project, commented: “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.”

Gramme 1 represents Wärtsilä’s first energy storage project participating in Belgium’s Capacity Remuneration Mechanism (CRM). This framework is designed to ensure Belgium’s energy supply security by enabling assets to deliver essential grid services such as frequency and voltage support that contribute to electricity system resilience and dependability.

David Hebert, Vice President of Global Sales Management, Wärtsilä Energy Storage, added: “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.”

Gramme 1 will utilise Wärtsilä's GridSolveTM Quantum2 energy storage system together with its control and optimisation software, GEMS, to deliver a standalone, fully integrated solution that enhances grid flexibility, reliability, and sustainability. Wärtsilä will also deliver the project under an engineered equipment delivery (EEQ) contract, with guaranteed asset performance under a separate long-term service agreement. With this project underway, Wärtsilä’s energy storage portfolio in Europe now exceeds 2.7 GWh.

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