Belgian Fund Backs Flagship 600-MWh Grid Battery in Visé Project

• I4B invests €30 m in a 600 MWh battery park in Visé, partnering with Luminus to boost grid stability and advance Belgium’s renewable-energy goals.

A major milestone in Belgium’s energy transition has been reached with I4B – The Belgian Infrastructure Fund committing EUR 30 million to a utility-scale battery energy-storage system in Visé, Liège Province. Rated at 600 MWh, the project will be one of the country’s largest when it comes on line, capable of absorbing excess wind- and solar-powered electrons for release when demand peaks or generation slumps.

I4B’s equity injection unlocks construction financing arranged alongside partner Luminus, Belgium’s second-largest energy supplier. The two companies say the battery park will provide critical grid-balancing services for the national transmission operator Elia, helping Belgium hit EU carbon-reduction milestones while reducing reliance on fast-ramping gas turbines.

Designed for four-hour discharge, the containerised lithium-ion system is expected to deliver frequency regulation and reserve capacity equivalent to powering roughly 150,000 homes for an evening peak. By firming up renewable output, it will also make room for more offshore wind imports and rooftop solar, sectors where growth is increasingly constrained by network congestion.

“This flagship BESS directly addresses security of supply, grid flexibility and decarbonisation—benefits that will flow to households and industry alike,” said I4B chief executive André Autrand, noting that the fund views long-duration storage as “foundational infrastructure” rather than a niche add-on.

The deal lands amid a broader storage build-out across Belgium. Last October, engineering group Sweco was tapped to design the 2,800-MWh Green Turtle battery park—among Europe’s largest—underlining how quickly storage capacities are scaling to match renewable ambitions.

With permits in hand, site mobilisation in Visé is slated to begin later this year. Commissioning is pencilled in for late-2027, after which the battery will operate under a 20-year services contract with Luminus. For I4B, the investment expands a portfolio that already spans onshore wind and solar assets, signalling the fund’s intent to back technologies that turn intermittent generation into dependable, dispatchable power.