CATL unveiled the TENER Sodium Energy Storage System on June 22, 2026, at a launch event in Munich, Germany, billing it as the world's first real-world validated sodium-ion energy storage solution. The Chinese battery maker expects cumulative shipments to reach 1 GWh by the end of 2026, with global deliveries beginning in June 2027.
The timing matters. Grid operators are adding storage faster than lithium supply chains can comfortably match, and the IEA reported that global EV battery deployment hit 1.2 TWh in 2025, up nearly 30 percent from 2024. CATL's answer is a chemistry built on sodium, which William Wu, director of CATL's Energy Storage Technology Center, described as "over 1,000 times more abundant than lithium and widely distributed."
The stakes are straightforward: lithium-ion storage has carried the grid for a decade, but its supply base is concentrated and its prices swing hard. Sodium-ion cells promise longer cycle life, better extreme-temperature performance, and lower cost potential. Whether those promises hold at scale is the open question, and CATL is the first company to put a commercial product behind them.
This story fits a pattern we have tracked in our battery tech coverage, where chemistry shifts tend to follow supply shocks rather than laboratory breakthroughs. The shift also arrives as AI data centers push peak demand curves steeper, which makes multi-hour storage a planning necessity rather than a nice-to-have for utilities.
Why Sodium, Why Now
Sodium sits in the same periodic table group as lithium, which means the electrochemistry translates without a full rewrite of cell design. The difference is abundance and cost. Lithium concentrates in a few geographies, and its price has swung by factors of five within a single year. Sodium is available in seawater and rock salt, and most countries can source it domestically.
That does not make sodium a drop-in replacement. Energy density remains lower, which is why CATL is targeting stationary storage first. Grid batteries do not care about weight, and they reward cycle life and cost per kilowatt-hour. Sodium-ion's longer cycle life and safer thermal behavior suit that use case well.
What TENER Sodium Actually Delivers
Each TENER Sodium module carries more than 30 MWh of rated capacity on a fully modular architecture. A single module weighs about 42 tonnes, and only 34 units are needed for a 1 GWh site. Energy and power blocks are decoupled, so storage durations can run 1, 2, 4, 6, or 8 hours depending on project requirements.
That modular design carries a maintenance payoff. Faulty modules can be isolated and replaced independently, which raises station-level availability and cuts operating costs. For operators running multi-hour sites, that matters more than peak efficiency numbers.
CATL also built a dedicated bidirectional voltage regulation system for the wide voltage range of sodium-ion cells. It boosts output automatically in the low-voltage range, which lifts round-trip efficiency by nearly 2 percent. On a 1 GWh site, that translates to millions of additional kilowatt-hours of generation per year.
The battery management system got a sodium-specific redesign too. Sodium's continuously sloping voltage curve allows more accurate state-of-charge estimation, and CATL says overcharge tolerance runs 20 percent higher than lithium-ion, giving operators a wider safety margin.
Cooling, Noise, and the Lithium Escape Hatch
Auxiliary power consumption is the unglamorous number that decides project economics. CATL's top-discharge airflow design cuts system heat generation by nearly 30 percent compared with conventional solutions, and combined with liquid cooling, auxiliary consumption drops from the industry average of 2 percent to 1 percent. On large, long-duration sites that saves millions of euros over the asset's life.
Noise is the other local constraint. TENER Sodium runs at 65 decibels, about 10 decibels quieter than conventional systems. That makes it easier to site storage closer to load centers, cutting transmission and distribution costs.
The platform is also physically compatible with LFP systems and shares the same footprint. A customer can switch between sodium-ion and lithium-ion batteries without changing enclosures, redesigning projects, or repeating certification. That is a hedge against lithium price volatility, and CATL says the platform reserves an upgrade path to 2000V high-voltage architectures.
A Decade and EUR 1.2 Billion in the Making
CATL has worked on sodium-ion since 2016 and says it invested nearly EUR 1.2 billion over the past decade. More than 300 R&D staff contributed, accumulating over 1,600 patent families and more than 200 granted patents. The company overcame more than 100 technical challenges and established the full manufacturing process from materials to cells.
On the supply side, CATL has built capacity for tens of thousands of tonnes of anode and cathode materials. It is investing RMB 5 billion to expand sodium-ion lines at its Fuding base, adding 40 GWh of annual capacity, while the Jining base in Shandong has 160 GWh planned. Mass-production lines are already commissioned and operational.
The commercial proof point came in April 2026, when CATL and system integrator HyperStrong signed a three-year, 60 GWh sodium-ion energy storage order. Amanda Xu, CATL's CTO for energy storage systems, framed the shift in her keynote: "The energy storage industry has moved beyond a race for scale. Today, success is increasingly defined by the ability to create long-term value."
What Happens Next
Deliveries in China begin this September, with cumulative shipments of 1 GWh expected by year-end. International deliveries follow in June 2027. Production costs for the NFPP cathode material are expected to fall further as the technology matures.
CATL is also building a closed-loop ecosystem covering cell R&D, system delivery, product testing, and commercial deployment. The company's stated position is that sodium and lithium will form the twin foundations of next-generation storage infrastructure.
It is not clear this will hold. The 60 GWh HyperStrong order is a single contract, and sodium-ion's energy density still trails lithium-ion for applications where weight and volume dominate, such as long-range electric vehicles. CATL's own framing acknowledges this by keeping sodium and lithium as co-equal foundations rather than declaring a replacement. The real test comes in 2027, when international customers can compare delivered performance against the spec sheet.
For now, the relevant fact is simpler: a major manufacturer has shipped a commercial sodium-ion storage product with named customers, named capacity, and a delivery schedule. That moves the chemistry from pilot to procurement, and procurement is where battery transitions actually happen.