Mapping of pumped storage potential in the Walloon Region

In the context of global climate change, Wallonia has made a firm commitment to energy transition. By 2050, renewable energy sources are expected to play a predominant role in the region. However, renewable sources such as wind and solar photovoltaic power are intermittent and not dispatchable, thus requiring effective energy storage solutions to balance future electricity supply and demand.

In this context, a joint study conducted by ICEDD, the University of Liège (ULiège), and the Université libre de Bruxelles (ULB) aimed to identify the most promising sites in Wallonia for implementing Pumped Hydro Energy Storage (PHES) facilities. After precisely defining physical criteria and regulatory constraints required for site selection, the study systematically and objectively analyzed the Walloon territory using cartographic methods.

Wallonia's distinctive terrain offers significant potential for developing flexible and responsive hydroelectric storage solutions. The analysis focused on surface sites, including natural areas with favorable topography, quarries, and existing hydraulic structures. Ultimately, 17 sites deemed most suitable were selected for detailed techno-economic assessment.