CATL has unveiled its latest TENER series, a battery energy storage system (BESS) utilizing sodium-ion chemistry, designed to enhance flexibility and stability for utility-scale projects. Debuted at Intersolar Europe 2026, the system offers a storage capacity of up to 30 MWh per container and supports configurable backup durations ranging from one to eight hours. With a lifespan of 15,000 cycles, the technology is engineered to perform reliably for 25 to 30 years. Commercial availability is slated for China in September 2026, with global distribution scheduled to commence in June 2027, providing a cost-effective alternative to lithium-based storage.
The new sodium-ion BESS addresses common industry challenges regarding system availability and performance in extreme climates. Unlike conventional lithium-iron-phosphate (LFP) batteries, the sodium-ion units can operate in temperatures ranging from -20°C to 45°C without derating. This resilience makes the technology particularly well-suited for diverse environments, including the Nordics, the Middle East, and Africa. By utilizing an AC-coupled architecture, the system allows for the decoupling of power blocks from energy segments, enabling operators to tailor PCS capacities to specific project requirements while maintaining high levels of operational efficiency.
To optimize power delivery, CATL has integrated a bidirectional DC voltage regulation system that compensates for voltage drops during low-charge conditions. This innovation boosts round-trip efficiency by up to 2% compared to LFP alternatives. Furthermore, the sodium-ion chemistry features a slope-based voltage curve, which allows for more precise real-time state-of-charge monitoring. This capability provides a 20% safety margin, significantly reducing the risk of overcharging. The modular design also ensures high system availability, as individual faulty units can be isolated or disconnected without interrupting the overall operation of the storage facility.