CATL's sodium-ion battery pack promises 30-year lifespan for grid storage
Chinese battery maker CATL unveiled the Tener, a grid-scale sodium-ion energy storage system, at an industry event in Munich on June 22. The system is rated at over 30 MWh per module and promises a 25–30 year operational lifespan — a claim backed by 15,000 charge/discharge cycles, well above the 10,000 cycles competing sodium-ion systems from BYD and HiNa advertise, per Notebookcheck. For utilities replacing aging infrastructure, that durability gap matters.
The specs
At -20°C, Tener retains over 92% of its rated capacity — a significant edge in cold climates where lithium batteries typically require expensive heating systems. Thermal runaway, a key safety concern with any large battery installation, is capped at 200°C surface temperature, which CATL says is 60% lower than conventional lithium packs. Mechanical expansion during charge cycles has also been reduced by 40%, lowering the risk of structural wear over time.
The modular design means scaling is straightforward: 34 modules stack up to 1 GWh. Each module weighs 42 tons, and the system operates at roughly 65 dB — quiet enough, CATL argues, for installations near residential areas. Power consumption of the system itself stays below 1%.
One practical detail for grid operators: Tener is fully compatible with existing LFP (lithium iron phosphate) infrastructure. Utilities don't need to rebuild substations — they can swap in sodium-ion modules directly.
On June 22, 2026, CATL unveiled the TENER Sodium Energy Storage System, the first field-validated sodium solution, offering greater flexibility, operational stability, and availability.
— CATL (@catl_official) June 22, 2026
• Greater flexibility. Over 30 MWh rated capacity, fully modular with each single module… pic.twitter.com/YA2xbiJsDN
The market picture
CATL says it has invested around €1.2 billion in sodium-ion R&D; since 2016 and is targeting 200+ GWh of total deployment, according to its press release. China deliveries begin in September 2026, with a target of 1 GWh shipped by year-end. Global commercial availability — including the US and UK — is scheduled for June 2027.
That timeline matters in context. LG Energy Solution and Fluence currently dominate US and UK utility storage contracts, and neither has a sodium-ion product on the market. LFP pack prices have fallen to around $50/kWh; CATL's sodium-ion cells are estimated at roughly €19/kWh at the cell level, per Edgen Tech, though pack-level pricing hasn't been confirmed. In the UK, domestic sodium-ion players like Faradion (now Reliance-owned) and AMTE Power remain small-scale.
No US or UK distribution partners have been announced. US tariff barriers may also complicate direct CATL imports, potentially pushing supply toward EU buyers first. Utilities considering 2027 procurement cycles will want clarity on pricing and local integration support before Tener becomes a realistic option.
