CATL Unveils World's First 9MWh TENER Stack Energy Storage System at ees Europe 2025

CATL unveiled the TENER Stack, the world's first 9MWh ultra-large capacity energy storage system solution set for mass production at ees Europe 2025, representing a strategic leap forward in capacity, deployment flexibility, safety, and transportability. 

In response to fast-growing global energy demands, from AI-driven data centres to industrial electrification, TENER Stack is engineered to help utilities, developers, and industrial users unlock greater economic value from every square metre of installation. 

"CATL has always been at the forefront of the energy transition," said Amanda Xu, CTO ESS & President of ESS Europe CATL. "To meet the expectation of a BESS system that has high energy density, small footprint, simpler AC-side configuration, and flexible deployment, we bring the latest CATL TENER energy storage solution. It breaks the limitations of power capacity and product transportation, and makes breakthroughs in space utilization, energy efficiency, and cost."

TENER Stack incorporates CATL's high-energy-density cells with five-year zero degradation technology, achieving a 45 percent improvement in volume utilisation and a 50 percent increase in projected energy density compared to conventional 20-foot container systems. The internal capacity reaches up to 9MWh, which is adequate to charge 150 electric cars or power an average German household for six years. 

To enhance compatibility and system efficiency, TENER Stack supports both centralised and string PCS (Power Conversion System) architectures. This dual-technology path ensures seamless integration with mainstream AC-side equipment and a wider array of grid applications.

The superior space efficiency of TENER Stack delivers significant economic value. For instance, deploying 800 MWh of storage using TENER Stack requires nearly one-third fewer containers than traditional 6 MWh systems. This reduces the number of PCS units and hidden costs associated with system oversizing, and increases land-use efficiency by 40 percent. Overall, developers can expect up to 20 percent optimisation in total station construction costs.