Batteries are no longer just an add-on: they are helping Belgium manage price spikes

The Belgian battery storage market has rapidly reached a stage where battery projects with capacities in the hundreds of MW are being added. The trend is also evident in operational data on injections into the grid. While at the start of last year batteries typically supplied only tens of MW, this year their output has repeatedly exceeded 500 MW. They supplied a record 640 MW in August this year, covering more than 7% of the Belgian power system’s load. Further large projects are under construction.

Belgium undoubtedly ranks among Europe’s leaders in the pace of development of electricity storage facilities. Of particular interest, however, is the availability of data on their electricity supply and consumption. Belgian transmission system operator Elia publishes battery storage data separately, meaning it can also be found on the Energostat section of oEnergetice.cz.

The data in the following chart show a marked growth in battery output. From figures in the low tens of MW at the beginning of 2025, Belgium gradually reached injections in the hundreds of MW. The highest hourly supply was 640 MW on 11 August 2026 at 20:00. In that hour, the Belgian power system’s load reached 8 957 MW and the average hourly electricity price was 193 EUR/MWh. Batteries therefore supplied output equivalent to approximately 7.1% of the entire system’s load.