TENER Energy Storage System
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CATL
Overview
CATL's grid-scale storage family and the product behind its five-year run as the world's largest storage battery supplier. The original TENER packs 6.25 MWh into a 20-foot container with claimed zero degradation across its first five years; the TENER Stack raised that to 9 MWh in May 2025. TENER Sodium, launched June 22, 2026, is billed as the first field-validated sodium-ion grid storage system, rated above 30 MWh per system with 15,000 cycles to 70% state of health, roughly 25 to 30 years of service.
Shipping at scale (121 GWh of storage cells in 2025); TENER Sodium deliveries start in China in September 2026