Two pieces of CATL news landed on the same day this week, and together they tell you something about where the world’s largest battery manufacturer is heading.
The first: CATL has signed a memorandum of understanding with Dutch energy solutions provider Alfen to deploy 5 GWh of its Tener Sodium energy storage systems across Europe, with installations scheduled to begin in 2027. The second: CATL retained its position as China’s dominant battery maker in June 2026 with a 42.70% market share, even as BYD continued to close the gap. Both stories connect back to the same underlying theme: sodium-ion battery technology is no longer a research project. It’s entering commercial deployment, and Europe is part of that rollout.
What the Alfen Deal Actually Means
CATL and Alfen have been working together since 2023, initially around lithium-ion battery supply. The new agreement represents a deliberate shift. By introducing sodium-ion technology into the partnership, Alfen is hedging against lithium price volatility and diversifying its battery material portfolio. Sodium is far more abundant than lithium and doesn’t require cobalt or nickel, which makes the cost structure significantly different over time.
The Tener Sodium system was launched publicly at an event in Munich in June this year. The headline specifications are worth knowing about. The system boasts a 15,000-cycle lifespan, offering a service life of 25 to 30 years based on a 70% State of Health standard.
That’s a meaningful number for grid storage, where the economics depend heavily on how long the hardware lasts relative to its installation cost. Through a proprietary bidirectional voltage control Power Conversion System, the Tener system stabilises output at 690V, improving Round Trip Efficiency by nearly 2%. Additionally, the system’s self-consumption rate has been reduced to 1%, half the industry average.
On safety, the system features a 40% reduction in cell expansion force and a 35% decrease in gas generation. Its thermal runaway surface temperature is approximately 200°C, significantly higher than that of traditional lithium-ion batteries. That matters for grid-scale installations where thermal events are a serious liability concern.
Cold weather performance is also addressed. Utilising dipole wide-temperature technology, the system retains over 92% capacity at -20°C and supports over 10,000 cycles at 45°C without requiring additional insulation or cooling. For Northern European deployments, that’s a practical advantage over systems that need active thermal management.
CATL has been expanding its European ambitions beyond just selling batteries for EVs. I covered how it’s been exploring battery swapping infrastructure in Europe and the Shenxing Pro fast-charging cells that have already made it into production vehicles. The Alfen deal is a different play: stationary energy storage for the grid rather than mobile batteries for vehicles, but it uses the same manufacturing scale and chemistry expertise.
China Battery Market: June 2026 Snapshot
The same week brought CATL’s monthly market share figures from China, and they’re instructive reading alongside the Alfen news.
CATL recorded power battery installations of 32.59 GWh in June, ranking first in the overall market with a 42.70% share. That’s a drop of 3.43 percentage points from May, the largest single-month decline among the top 15 manufacturers. But it needs context: China’s domestic power battery installations reached 76.5 GWh in June, up 31.5% year-on-year and 6.4% from May, marking the fastest growth rate so far this year. CATL’s share fell in a month when the total market grew significantly, which suggests other manufacturers are growing faster right now rather than that CATL is losing ground in absolute terms.
BYD ranked second with installations of 14.11 GWh, giving it an 18.49% market share, up 1.92 percentage points from May. BYD’s share has been climbing steadily, and the gap with CATL narrowed by around 5.4 percentage points from May. CATL and BYD still jointly controlled 61.19% of China’s power battery market. That’s a remarkably concentrated market at the top.
| Company | Installations (GWh) | Market share | vs May |
|---|---|---|---|
| CATL | 32.59 | 42.70% | -3.43 pp |
| BYD | 14.11 | 18.49% | +1.92 pp |
| CALB | 5.20 | 6.82% | +0.82 pp |
| Gotion High-tech | 4.96 | 6.49% | +0.30 pp |
| Eve Energy | 4.45 | 5.84% | +1.33 pp |
| Top 5 combined | 61.31 | 80.34% | |
| Total market | 76.50 | 100% | +31.5% YoY |
Source: CABIA via CNEVPost
The chemistry breakdown is the other notable figure. LFP battery installations reached 63.7 GWh, accounting for a record 83.3% of the overall market. If you’ve been following the LFP vs NMC debate, this is a significant data point. LFP’s share of the Chinese market has been rising for years, driven by cost advantages and improving energy density. A record 83.3% in a month when total installations grew 31.5% year-on-year is a clear signal about where the industry is heading.
In the NMC segment, CATL’s dominance is even more pronounced. In the ternary power battery market, CATL maintained an overwhelming lead with installations of 9.18 GWh and a 72.56% share.
Why This Matters for European EV Buyers
The CATL-Alfen deal is a grid storage story, not directly an EV story. But the underlying technology development matters for anyone following EVs. Sodium-ion cells that can operate reliably at -20°C without additional thermal management, last 25 to 30 years in grid deployment, and don’t depend on lithium or cobalt are the same technology that manufacturers are working to scale into vehicle applications. The economics aren’t quite there yet for EVs, but commercial grid deployment at 5 GWh scale is how the manufacturing cost curve starts to move.
Meanwhile, the Chinese market data confirms what BYD’s megawatt charging push and Zeekr’s Golden Battery already suggested: the pace of battery technology development in China isn’t slowing down. European grid operators working with Alfen on the Tener Sodium deployment will be among the first outside China to get hands-on experience with what CATL’s next generation of chemistry can do.
FAQ
What is the CATL Tener Sodium system?
The Tener Sodium is CATL’s commercial sodium-ion battery storage system for grid applications. It was launched at an event in Munich on 22 June 2026. Key features include a 15,000-cycle lifespan, 25 to 30 years of projected service life, 92% capacity retention at -20°C and a thermal runaway surface temperature of around 200°C, which is higher than conventional lithium-ion systems.
What is the CATL-Alfen deal?
CATL and Dutch energy provider Alfen have signed a memorandum of understanding to deploy 5 GWh of Tener Sodium energy storage systems across Europe. Deployments are scheduled to begin in 2027. The partnership extends a cooperation that started in 2023 with lithium-ion supply.
What is CATL’s market share in China?
In June 2026, CATL held a 42.70% share of China’s power battery market with 32.59 GWh of installations. BYD ranked second with 18.49%. The two companies together controlled 61.19% of the market.
Why is LFP battery share at a record high in China?
LFP (lithium iron phosphate) batteries accounted for 83.3% of China’s power battery market in June this year, a record figure. LFP has been gaining share over NMC chemistry due to lower cost, longer cycle life and improved energy density. The trend reflects both BYD’s exclusive use of LFP and wider industry adoption by other manufacturers.
Does the sodium-ion deal affect EVs?
Not directly. The Tener Sodium system is designed for grid-scale stationary storage, not vehicle applications. However, commercial deployment at scale helps drive down manufacturing costs and validates sodium-ion chemistry in real-world conditions, which could accelerate its eventual use in electric vehicles.
Featured Image Source: CATL
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