The world’s largest battery maker says 20 of its plants are now carbon neutral and its supply chain will follow by 2035. The timeline lines up closely with EU rules that will start blocking high-carbon batteries from the European market in 2027, and the company’s own numbers show why its factories were always the easier half of the problem.
CATL supplied 39.2% of the batteries installed in electric vehicles worldwide in 2025, according to SNE Research, the only manufacturer above 30% and, together with fellow Chinese maker BYD at 16.4%, more than half of a global market that itself grew 31.7% to surpass 1,000GWh for the first time. Against that scale, the carbon-neutrality announcement CATL made in Ningde on August 17 is less a sustainability update than a statement about the terms on which the world’s dominant battery supplier intends to keep selling into its largest export market.
The company confirmed it had met, on schedule, the first half of a two-stage plan first announced in 2023: carbon neutrality across its “core operations” by the end of 2025. Twenty CATL plants now hold certification under ISO 14068-1, the international carbon-neutrality standard, and the company says zero-carbon electricity covered 100% of the power its factories used. CATL also reports genuine efficiency gains behind that certification, not just accounting: energy consumption per unit of battery output fell 28% between 2022 and 2025, and carbon-emissions intensity fell by roughly 77% over the same period, cutting more than 10 million tonnes of CO2-equivalent by the company’s own estimate. Those are real, measurable changes to how batteries get made, and they should be counted separately from the mechanism that actually delivers the “neutral” label. ISO 14068-1, like every carbon-neutrality standard in use today, allows companies to offset whatever emissions remain after reduction measures with purchased carbon credits. CATL’s own materials draw this distinction explicitly, crediting the efficiency gains to operational changes while noting that residual emissions were “balanced with verified carbon credits.” That is a legitimate use of a recognized standard, but it means “carbon neutral” describes an accounting outcome, not a factory that emits nothing.
The more consequential number in CATL’s own disclosure is the one describing what the 2025 milestone did not cover. The company estimates that more than 80% of the lifecycle emissions attached to its batteries occur in its supply chain, in mining, material refining, component production, and transport, and that this upstream footprint is more than five times the size of everything CATL’s own plants produce. Three years of work bought CATL certification over roughly a sixth of its real climate exposure. The 2035 target addresses the other five-sixths, and unlike the factory floor, CATL does not own the mines, refineries, or shipping lines involved.
The timing of that second phase is where the announcement becomes more interesting than a standard corporate sustainability update. The European Union’s Battery Regulation, in force since 2024, already requires carbon-footprint declarations for electric-vehicle batteries sold in the bloc, a requirement that took effect in February 2025 and was extended to industrial batteries above 2kWh in February 2026. From February 2027, every EV, industrial, and light-transport battery placed on the EU market must carry a digital battery passport disclosing that footprint by QR code. The more significant deadline follows a few months later: by July 2027, the European Commission is due to set maximum lifecycle-emissions thresholds by battery category, after which any battery exceeding the limit will be barred from the EU market outright. CATL’s own procurement announcement at the Ningde event, requiring suppliers to provide carbon-footprint data starting in 2027, lands in the same year the EU moves from disclosure to exclusion. Given that CATL’s customer list includes Tesla, BMW, Mercedes-Benz, and Volkswagen, alongside its dominant position in China, a compliance failure on carbon data is not a reputational problem; it is a market-access one, and the Carbon Chain platform CATL built to track more than 1,000 emissions models across its production and supplier base reads as much like regulatory infrastructure as climate strategy.
That reframing does not make the 2035 goal easier to hit. Carbon Chain has so far compiled operational emissions data from just over 100 core tier-one suppliers, a starting inventory rather than a completed one, and tier-one component makers are typically at least one step removed from the mining and refining operations that generate the bulk of a battery’s embodied carbon. Lithium, nickel, and cobalt extraction and processing are among the more carbon- and energy-intensive links in any battery supply chain, and they are also among the hardest to audit, spread across jurisdictions with uneven environmental reporting standards and, in several cases, minimal independent verification of the energy sources used to power smelting and refining. CATL says its platform can trace emissions back through mineral extraction and material synthesis, and it has signed cooperation agreements with cathode, anode, and current-collector suppliers, plus a strategic partnership with China’s National Center for Climate Change Strategy and International Cooperation. What it has not published is supplier-specific targets, interim milestones, or a verification regime comparable to the third-party certification behind its own plants. The company’s own framing, in board secretary Jiang Li’s comment that “carbon neutrality cannot be built on estimates alone” and requires “reliable data, clear boundaries and systematic execution,” sets a standard the 2035 phase has not yet met by its own definition of rigor.
There is also a question embedded in CATL’s “100% zero-carbon electricity” claim that the announcement does not address. Chinese manufacturers typically meet renewable-electricity targets through green electricity certificates, a mechanism broadly similar to renewable energy certificates used elsewhere, which represent a claim on renewable generation somewhere on the grid rather than a guarantee that the specific electricity consumed at a specific plant, at the moment it was consumed, came from a zero-carbon source. That is an industry-wide accounting convention, not something unique to CATL, but it means the 100% figure describes a certificate-matched claim rather than a physically verified one, a distinction that matters more as the same accounting approach gets extended to a supply chain; the EU’s own rules are designed to test with harder, site-specific data.
CATL’s chairman, Robin Zeng, framed the announcement partly as an attempt to shape the rules rather than simply follow them, telling the Ningde audience that “before contributing to global carbon rules and standards, CATL must first prove what is possible through our own industrial practice.” For the company holding close to 40% of a market, the EU is simultaneously trying to green and derisk away from Chinese supply concentration, setting the practical benchmark for what compliant carbon data looks like, which is also a way of influencing what the eventual EU thresholds can reasonably require. Whether the 2035 target is met will depend less on CATL’s own factories, which have already done the more tractable part of the work, and more on whether a data platform built to satisfy a 2027 market-access deadline can also produce verifiable reductions across mining and refining operations the company neither owns nor controls.
