Contemporary Amperex Technology Co. Limited (CATL) has launched the world’s first 9MWh ultra-large capacity energy storage system, the TENER Stack, at the ees Europe 2025 exhibition. This next-generation system sets a new benchmark in energy density, deployment flexibility, and transport efficiency for utility-scale storage solutions.
Designed to meet rising global energy demands driven by AI data centers and industrial electrification, the TENER Stack leverages CATL’s advanced high-energy-density cells and five-year zero degradation technology. It achieves a 45% improvement in space utilization and a 50% increase in energy density over traditional 20-foot container systems. With a capacity of 9MWh, it can charge 150 electric vehicles or power a German household for six years.
The system supports both centralized and string PCS (Power Conversion System) architectures, ensuring wide AC-side compatibility and cost savings. Developers deploying 800 MWh with TENER Stack could reduce container usage by one-third and cut construction costs by up to 20%.
To address logistics challenges, CATL introduced a modular “two-in-one” design. Each unit remains under the 36-tonne transport limit, enabling compliance across 99% of global markets and reducing shipping costs by 35%.
Safety innovations include robust LFP chemistry, enhanced gas sensors, triple-layer fire insulation, and compliance with seismic standards up to magnitude 9 earthquakes. An overhead thermal management system improves efficiency while reducing noise and maintenance costs, making it urban-friendly at just 65dB(A).
TENER Stack builds upon CATL’s TENER and TENER FLEX series and reaffirms the company’s commitment to the global energy transition. “This is more than a product—it’s a vision for accessible, scalable energy,” said Hank Zhao, CTO, ESS Europe CATL.
