CATL unveiled the TENER Sodium Energy Storage System in Munich on June 22, 2026, calling it the world's first real-world validated sodium-ion energy storage solution. The company says cumulative shipments will reach 1 GWh by the end of 2026, with global deliveries starting in June 2027.
The timing matters. Renewable energy's share of the grid keeps climbing, and AI-driven power demand is surging. Storage is no longer a supporting role. It is critical infrastructure, and the industry has leaned almost entirely on lithium, whose concentrated supply and volatile prices create real supply chain risk.
CATL's answer is sodium. Sodium is more than 1,000 times more abundant than lithium and widely distributed across continents. William Wu, Director of CATL's Energy Storage Technology Center, said at the launch that the company wants a chemistry built on abundant resources, one that can serve the energy needs of all eight billion people while offering longer cycle life and enhanced safety. "We believe that sodium and lithium together will form the twin foundations of the future energy storage system," Wu said.
What the TENER Sodium System Actually Delivers
The system delivers more than 30 MWh of rated capacity on a fully modular architecture. Each 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 be configured at 1, 2, 4, 6, or 8 hours depending on project requirements.
Faulty modules can be isolated and replaced independently. That improves station-level availability while cutting operating costs and maximizing asset utilization.
CATL also built a station-level platform specifically for sodium-ion chemistry. A dedicated bidirectional voltage regulation system boosts voltage automatically in the low-voltage range, allowing the power conversion system to deliver optimal output across the full range. Round-trip efficiency improves by nearly 2 percent, which for a 1 GWh station means millions of additional kilowatt-hours per year.
The battery management system was designed around sodium's continuously sloping voltage curve, enabling more accurate state-of-charge estimation. Overcharge tolerance is 20 percent higher than in lithium-ion batteries, giving operators an extra safety margin.
Auxiliary power consumption dropped from the industry average of 2 percent to 1 percent. A top-discharge airflow design cuts system heat generation by nearly 30 percent compared with conventional solutions. The system runs at 65 decibels, 10 decibels quieter than conventional systems, which helps address community concerns and allows stations to be built closer to load centers.
Built to Work Alongside Lithium
TENER Sodium is compatible with LFP systems and shares the same physical footprint. The same platform can hold either sodium-ion or lithium-ion batteries without changing enclosures, redesigning projects, or repeating certification. That gives customers a practical hedge against lithium price swings.
The system also reserves an upgrade path to 2000V high-voltage architectures, so it can adapt as technology evolves.
Amanda Xu, CTO of ESS and President of ESS Europe at CATL, framed the launch around readiness. "The energy storage industry has moved beyond a race for scale. Today, success is increasingly defined by the ability to create long-term value," Xu said. "The principle we most firmly believe in is that readiness creates certainty."
A Decade of Work Behind the Launch
CATL has been developing sodium-ion batteries since 2016. The company invested nearly 1.2 billion euros over the past decade, with more than 300 R&D professionals involved. The effort produced more than 1,600 patent families and over 200 globally granted patents, and solved more than 100 technical challenges across the full manufacturing chain from materials to cells.
On the supply side, CATL has built capacity for tens of thousands of tonnes of anode and cathode materials. Production costs for the NFPP cathode chemistry are expected to fall further as the technology matures.
The company invested RMB 5 billion to expand sodium-ion production lines at its Fuding base, adding 40 GWh of annual capacity. The Jining base in Shandong has 160 GWh of planned sodium-ion capacity. CATL says its mass-production lines are fully commissioned and operational.
The Commercial Reality Check
In April 2026, CATL and HyperStrong signed what the companies called the world's largest sodium-ion commercial contract: a three-year, 60 GWh order. That marked the entry of sodium-ion storage into the GWh-scale deployment era.
First deliveries in China begin this September. Cumulative shipments are expected to reach 1 GWh by the end of 2026, with international deliveries scheduled for June 2027.
The open question is whether the cost advantage holds at scale. Sodium-ion energy density trails lithium-ion, so the economics depend on sodium's cheaper raw materials and longer cycle life offsetting the larger physical footprint. CATL's compatibility play, letting customers switch between chemistries on one platform, reduces the risk of betting on sodium too early. But it also means the technology is being sold partly as a hedge, not yet as a full replacement.
Competitors Are Not Standing Still
CATL is not alone. BYD and several Chinese cell makers have announced their own sodium-ion programs, and startups in Europe and North America are pursuing alternative chemistries for grid storage. The difference is that CATL has a signed 60 GWh contract and commissioned production lines, while most rivals are still in pilot or demonstration phases.
That gap could close quickly. Sodium's raw material abundance means no single company controls the feedstock the way lithium is concentrated among a handful of producers. If costs fall as CATL predicts, competitors with cheaper labor or local supply chains could undercut pricing within a few years.
Why This Matters Now
Grid operators are under pressure to add storage fast enough to absorb renewable generation and serve AI data center load. Lithium supply is concentrated and prices swing. A commercially validated sodium-ion alternative with a 60 GWh contract behind it gives buyers a second source with a more stable supply base.
CATL has been here before. The company pioneered LFP as the mainstream storage chemistry, then defined dedicated storage cells at 280Ah, 314Ah, and 587Ah. Each transition moved the industry forward. Whether TENER Sodium does the same will be clearer once the first 1 GWh ships and operators report real-world cycle data.
For more on battery chemistry and grid storage, see Reuters energy coverage and our battery tech coverage.