IN Brief:
- ENGIE and NHOA Energy have started construction on the 320MWh Drogenbos battery project in Belgium.
- The system will be located at ENGIE’s Drogenbos power station near Brussels.
- Belgium’s capacity market is supporting storage deployment as flexibility and adequacy requirements increase.
ENGIE and NHOA Energy have started construction on a 320MWh battery energy storage system at the Drogenbos power station near Brussels.
The project is one of the largest battery storage schemes in the Benelux region and forms part of ENGIE’s Belgian storage portfolio. NHOA Energy is supplying the system, which is designed to provide up to four hours of discharge capacity once operational.
The Drogenbos battery has been awarded support under Belgium’s Capacity Remuneration Mechanism, with a 15-year contract scheduled to begin in November 2027. The revenue structure places storage within the country’s adequacy framework, rather than leaving the asset dependent only on short-term merchant flexibility revenues.
Belgium’s power system has a growing requirement for firm and flexible capacity. Nuclear policy, interconnection, gas generation, renewable deployment, and demand growth all influence the country’s supply-demand balance. Battery storage cannot replace every function of dispatchable generation, but it can deliver rapid response, short-duration adequacy, frequency support, congestion management, and renewable output shifting.
Drogenbos also shows how existing power station locations are being adapted for new electricity system functions. Sites with grid access, industrial land use, control infrastructure, and established operational arrangements can offer practical advantages for storage deployment. That can reduce some development barriers compared with new greenfield grid connections, although the electrical design still has to meet modern inverter-based system requirements.
Four-hour battery systems are becoming more common in European markets as storage moves beyond short-duration frequency response. Longer discharge duration allows an asset to shift more electricity across the day, support evening demand periods, and participate in capacity or adequacy schemes. It also requires more complex operation, because cycling strategy, degradation management, state-of-charge control, and market optimisation all affect lifetime performance.
The broader European storage market is moving in the same direction. The acceleration of co-located renewable and battery projects across Europe has been driven by grid congestion, curtailment, and price volatility. Drogenbos is not primarily a co-located renewable project, but it serves the same system requirement: controllable flexibility in a power market with rising variable generation.
Contracted revenue models are becoming central to larger battery projects. Capacity mechanisms, long-term tenders, tolling agreements, and regulated procurement routes can provide the revenue certainty needed to finance larger systems. They also create performance obligations, requiring assets to be available under defined conditions rather than simply trading when market spreads are favourable.
The technical integration of a battery at Drogenbos will depend on more than container installation. Battery modules, inverters, transformers, thermal management, fire safety systems, protection equipment, control platforms, and communications systems all have to be coordinated with grid operator requirements. Power quality, reactive power capability, fault behaviour, emergency response, and availability testing will shape commissioning and operation.
European storage deployment is now developing across several site types. Standalone batteries provide market and grid services, co-located batteries improve renewable capture value, industrial batteries manage site power, and power-station batteries repurpose grid-connected energy locations. Drogenbos sits in the last category, using an existing energy site to provide a new flexibility function.
Construction progress separates Drogenbos from the large volume of storage projects still at announcement, planning, or financing stage. Supply chains, civil works, grid studies, safety cases, commissioning tests, and operational readiness now determine delivery. For Belgium, the project adds a substantial battery asset to a system where adequacy, flexibility, and renewable integration are becoming increasingly connected.
