As a pioneer in Europe’s green energy transition, the Netherlands has accelerated its renewable energy deployment in recent years. However, the intermittency and instability of renewable power generation pose challenges to the stable supply of electricity. Meanwhile, urban development drives growing electricity demand for municipal facilities, especially during peak hours. Among them, municipal sewage treatment plants, as core urban infrastructure, have large electricity loads and high stability requirements, while facing the pressure of peak electricity price costs and the risk of demand overruns. In this context, alleviating the contradiction between energy supply and demand, improving energy utilization efficiency, and seeking the synergy of economy, stability and environmental protection have become key measures for municipal departments.

In May 2025, TWS Technology officially commissioned a tailor-made grid-connected industrial and commercial energy storage project for a municipal sewage treatment plant in the Netherlands, providing a new solution for optimizing the Dutch energy supply system and the green transformation of its wastewater treatment sector. The energy storage project has a power and capacity of 500 kW/ 978 kWh and is composed of 3 sets of TWS ProeM liquid-cooling energy storage cabinets, 5 sets of 100kW PCS, 1 DC combiner and 1 AC combiner.

Innovative Design, Rapid Deployment

The energy storage system adopts an on-site installation-free integrated delivery model. It innovatively uses a pre-assembled, modular plug-and-play design, eliminating the need for foundation construction and flexibly adapting to diverse ground conditions. Compared with traditional solutions, this integrated solution effectively avoids 2-3 weeks of foundation pouring and wiring, significantly reducing initial investment costs while fundamentally eliminating carbon emissions from concrete construction. Its intelligent plug-and-play feature enables rapid energy connectivity within just 8 hours, reducing commissioning time by 80% and significantly boosting delivery efficiency.

Triple Value: Economy, Reliability, Sustainability

Relying on a PCS efficiency of up to 98% and a battery cabinet charge-discharge efficiency of 93% at 0.5C, the system ensures high-performance energy storage and release, minimizing waste and enhancing energy utilization. It also meets the energy demands of customers and realizes multiple values simultaneously by integrating an " economy + reliability + sustainability " trinity strategy.

· Economy: Through a 0.5C charge-discharge strategy, the system achieves two charge-discharge cycles daily using peak-valley price differences. Coupled with demand control that reduces maximum power load by 15%, it is expected to save annual electricity costs by over €120,000.

· Reliability: Equipped with a diesel generator interface, the system can seamlessly switch to backup power in extreme situations, ensuring the 24-hour uninterrupted operation of the sewage treatment plant.

· Sustainability: The project reduces annual carbon dioxide emissions by approximately 280 tons, facilitating the municipal department to smoothly achieve its carbon neutrality goal by 2030.

The successful implementation and operation of this energy storage project represent a win-win outcome for the municipality, the power grid, and the community. The energy storage system enhances the stability and reliability of power supply, reducing impacts on wastewater treatment operations caused by outages or fluctuations, ensuring stable plant operation, lowering electricity costs, and improving operational management and service quality. A stable wastewater treatment plant, in turn, can better handle urban sewage, protect local water environments, enhance the quality of residents' living environment, and bolster the sustainable development of the city. Additionally, after connecting to the grid, the energy storage system helps alleviate peak-hour power supply pressures on the local grid, improves grid stability, promotes the integration of renewable energy, and contributes to the optimization of the energy structure and the realization of sustainable development goals.

This successful collaboration with the municipal sewage treatment plant in the Netherlands marks another important milestone for TWS Technology in global expansion. Moving forward, TWS Technology will build on this foundation to further deepen cooperation with local enterprises and institutions, explore broader energy storage applications and expand partnerships to drive energy transformation. Meanwhile, TWS Technology will continuously increase investment in R&D, enhance the performance and intelligence level of its energy storage systems, contribute more Chinese wisdom and solutions to the energy transition in the Netherlands and the world, and inject new impetus into the global sustainable energy development.