From a cheap alternative to a long-life contender
How sodium-ion batteries are discussed is changing. Once framed as a cheap alternative when lithium was expensive, they are now being positioned around lifetime and safety. CATL and Dutch company Alfen have signed an MOU to deploy 5GWh of sodium-ion BESS in Europe. According to media reports, deployment will begin in the Netherlands and extend to Western European countries from 2027, making it the first full-scale commercial sodium-ion rollout for European grid storage. In the same week, China made a tax-policy decision that supports this direction.
Tener Sodium—the performance story is lifetime and low temperature
Tener Sodium made its global debut in Munich on June 22, 2026, and CATL calls it the world's first sodium-ion BESS validated in real operation. CATL's announcement states that it supports rated capacity above 30MWh and 1/2/4/6/8-hour discharge configurations, with 1% self-consumption—half the industry average of 2%—and system round-trip efficiency (RTE) about 2% higher than LFP. Media coverage at launch also reported 15,000 cycles, up to 30 years of calendar life, and capacity retention above 92% at −20°C, showing that the product is positioned around lifetime and low-temperature performance.
Alfen has operated in BESS since 2011 and has deployed more than 1GWh in Europe. It has had a lithium-ion supply partnership with CATL since 2023; this agreement extends that relationship to sodium-ion. For Alfen, it lowers lithium-price volatility risk and supports bid competitiveness. For CATL, it creates experience with European grid-code compliance and accelerates global volume production.
China's tax policy—tax lithium, exempt sodium-ion
China's tax-policy change supports commercialization. The Ministry of Finance, General Administration of Customs, and State Taxation Administration announced a 2% consumption tax on lithium-ion batteries from September 1, 2026, rising to 4% from September 2027. This ends an exemption that had continued since February 2015. Sodium-ion, solid-state, and fuel-cell batteries will remain exempt through the end of 2028. The industrial-policy logic is clear: tax a mature technology while using exemptions to favor next-generation technologies.
The scale provides context. According to industry media reports, China's EV battery installations in the first half of 2026 reached 335.6GWh, up 12.0% year on year, so a 2% tax on lithium-ion is not immaterial in absolute terms. CATL has also signed what it calls the world's largest sodium-ion energy-storage cooperation agreement—60GWh over three years—with HyperStrong, and a dedicated production expansion in Fujian has been reported. Tax policy and investment are both beginning to structurally favor sodium-ion commercialization.
Europe's first full-scale rollout
CATL and Alfen signed a 5GWh MOU, according to the companies. Deployment from 2027 is reported by media, with Alfen's 1GWh+ European track record providing the channel.
Lifetime is the selling point
CATL states 30MWh+, 1% self-consumption, and RTE +2%. Media reports cite 15,000 cycles and up to 30 years: the proposition is long life, not only low cost.
China's tax policy adds support
Lithium-ion faces a 2% then 4% tax, while sodium-ion, solid-state, and fuel-cell batteries are exempt through 2028. The policy direction toward next-generation technology is explicit.
Supply is being built first
CATL's 60GWh, three-year agreement with HyperStrong is described by CATL as the world's largest of its kind. Volume capacity is being built ahead of demand.
Business implications and points to confirm
For energy-storage procurement and investment, the questions are: (1) the total-cost-of-ownership comparison between LFP and sodium-ion in long-duration, cold-climate, and high-cycle use, including whether 15,000 cycles is proven in operation; (2) whether European grid-code compliance, insurance, and financing precedents form through Alfen projects; and (3) when, and by how much, China's tax differential is passed through to cell prices—the 2% tax from September 2026 could affect LFP export prices as well. Sodium-ion is beginning to create its own market as a candidate lead technology for long-life grid storage, rather than merely a substitute for lithium.