CATL introduced the Tener Sodium energy storage system on Monday, describing it as the world’s first sodium battery energy storage solution proven in actual field operation.

The world’s largest battery manufacturer unveiled the product at its 2026 CATL energy storage new product event. According to the company, the system has been re-engineered to deliver greater flexibility, higher operational stability and superior system availability.

The new storage system offers a rated capacity exceeding 30 MWh and is built on a fully modular architecture, with each module weighing 42 tonnes. It accommodates 1-, 2-, 4-, 6- and 8-hour storage applications and can be adapted flexibly to meet specific project needs.

CATL stated that the system incorporates its industry-first Bi-DC dual-direction voltage control, which improves round-trip efficiency by nearly 2%. The decoupling of energy and power further streamlines project deployment, the company noted.

In terms of operational stability, the system provides an exceptionally long cycle life. At 25°C, it can achieve 15,000 cycles at 70% state of health, equating to a service life of 25 to 30 years. The system is also designed for all-climate use, delivering more than 10,000 cycles at 45°C and retaining over 92% of its capacity at minus 20°C. CATL added that the system is capable of suppressing fire and explosion under extreme conditions.

System availability is another key area. CATL’s first-of-its-kind millisecond-level self-healing technology can locate and isolate a fault within 200 milliseconds and restore unaffected sections within 150 milliseconds, providing station-level redundancy at minimal additional cost. The system is fully size-compatible with lithium batteries and supports seamless switching.

CATL confirmed that mass production is ready. Initial deliveries in China will begin in September, with the company expecting to ship 1 GWh by the end of 2026. Global commercial deliveries of Tener Sodium are scheduled to commence in June next year.

The launch marks another step in CATL’s accelerated push into energy storage. The company previously introduced the five-year zero-degradation Tener system in April 2024 and the 9 MWh high-capacity Tener Stack in May 2025.

The move comes amid rapidly growing momentum in the sodium battery industry. In April, CATL signed a landmark three-year supply agreement totaling 60 GWh with Chinese energy storage system provider HyperStrong, setting an industry record. To meet rising demand, the company later announced a 5 billion yuan ($739 million) investment to build 40 GWh of sodium-ion battery production capacity in Fujian.

By the end of 2025, CATL’s cumulative investment in sodium battery R&D had approached 10 billion yuan, according to information the company previously disclosed. Since April 2025, CATL has also been advancing the commercialization of sodium batteries for passenger vehicles under its Naxtra brand.

CATL founder and chairman Robin Zeng has previously told investors that, over the long term, low-cost sodium-ion batteries could replace 30% to 40% of the existing battery market.

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