CATL Sodium-ion Battery is moving from pilot projects into large-scale European deployment. CATL has signed a memorandum of understanding with Dutch energy company Alfen to deploy 5 GWh of its Tener Sodium energy storage systems across Europe. As a result, this deal ranks among the region’s largest sodium-ion commitments to date. More importantly, it shows that long-life battery storage is becoming a central part of the grid buildout in 2026.
CATL launched the Tener Sodium platform in Munich on June 22, and Alfen plans to begin deployments in 2027. Alfen already has deep experience in the sector. The company has built battery energy storage systems since 2011 and has installed more than 1 GWh across Europe. It also has sourced Lithium-ion cells from CATL since 2023. Now, however, Alfen is expanding its storage portfolio with sodium-ion systems to strengthen supply resilience and improve cost efficiency.
CATL sodium-ion battery deal brings 5 GWh to Europe
The scale of this agreement stands out. CATL and Alfen plan to deploy 5 GWh of storage capacity, which gives sodium-ion a much larger role in the European grid market. In addition, the timing matters. The sodium-ion battery segment has accelerated quickly in 2026, and this agreement adds major commercial weight to that trend.
Alfen CEO Michael Colijn described sodium-ion as the next step in energy storage. That view fits the market’s direction. Grid operators want batteries that offer long service life, strong safety performance, and reliable operation in a wide range of temperatures. Therefore, sodium-ion is gaining attention because it matches those priorities well.
CATL sodium-ion battery focuses on long service life
CATL is not leading with energy density in this case. Instead, it is emphasizing lifespan and durability. The Tener Sodium system is rated for 15,000 cycles. CATL says that performance supports a 25-to-30-year service life at a 70% state-of-health threshold. For grid storage, that figure matters because daily cycling over decades can improve long-term project economics.
This long-life profile gives developers a clear value proposition. A battery that cycles every day for 25 to 30 years can lower replacement needs over the life of a project. As a result, utilities and storage integrators can plan around a durable asset with a very long operating window.
CATL sodium-ion battery performance in hot and cold conditions
Temperature performance is another major selling point. CATL says its dipole wide-temperature technology allows the battery to retain more than 92% of its capacity at -20°C. It also supports more than 10,000 cycles at 45°C. That matters for storage projects in cold winters and hot summers across Europe and beyond.
Moreover, CATL says the system can deliver that performance without the added insulation or active cooling that lithium systems often use in extreme climates. Consequently, developers may reduce hardware complexity and improve efficiency at the system level.
CATL sodium-ion battery efficiency and safety features
CATL also highlights several technical gains in the Tener Sodium platform. The company says its bidirectional voltage-control power conversion system holds output at 690V. It also claims this design improves round-trip efficiency by nearly 2%. In addition, CATL says the system cuts self-consumption to 1%, which is half the industry average.
On safety, CATL reports a 40% reduction in cell expansion force and 35% less gas generation. The company also cites a thermal runaway surface temperature of around 200°C. Together, these metrics support CATL’s position that sodium-ion can deliver a strong safety profile for stationary storage.
CATL sodium-ion battery benefits from abundant materials
The commercial appeal of sodium-ion goes beyond battery specifications. Sodium is about 1,000 times more abundant than lithium, and it is cheaper to source. Therefore, battery buyers can diversify material inputs while improving protection against lithium price swings. Alfen said the move will help optimize cost structures and improve resilience against lithium price volatility.
That supply advantage matters in a market that wants stable project economics. As more grid storage projects move from planning to execution, operators want battery chemistries that support predictable costs over many years. In that context, sodium-ion gives developers another practical option.
CATL sodium-ion battery joins a fast-growing 2026 market
The Alfen agreement is not an isolated event. In April 2026, CATL signed a 60 GWh sodium-ion supply agreement with integrator HyperStrong. That deal became the largest sodium-ion order announced so far. CATL said at the time that the chemistry was ready for mainstream use.
Across the broader market, sodium-ion storage has gained momentum as companies focus on grid applications. That makes sense because grid storage values cycle life, safety, wide-temperature tolerance, and cost control. Unlike Electric Vehicles, stationary storage does not depend as heavily on maximum energy density. Therefore, sodium-ion can fit the job very well.
CATL sodium-ion battery could reshape grid storage economics
The CATL and Alfen partnership shows why sodium-ion has become one of the most closely watched battery segments in 2026. The headline is not only the 5 GWh deployment target. It is also the 15,000-cycle rating, the 25-to-30-year service life, and the ability to retain over 92% capacity at -20°C. Those figures point to a battery designed specifically for the needs of modern grids.
As Europe adds more renewable electricity, utilities need storage systems that can cycle often and perform reliably for decades. CATL’s sodium-ion platform aims to meet that need with durability, efficiency, and material abundance. If deployments begin on schedule in 2027, this partnership could become an important marker in the expansion of sodium-ion grid storage across Europe.
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