When it comes to steel, Japan sits at a critical moment. As one of the world’s largest steel producers and consumers, the choices it makes in the coming years will shape global steel markets, technology pathways and emissions outcomes well beyond its borders. Whether Japan’s transition delivers real emissions reductions or locks in high-carbon infrastructure is a choice.
The SteelZero team met with diverse players in Japan’s steel industry to understand what is working, and what is needed to unlock a genuinely net zero steel transition.
In the coming weeks, we’ll also bring you insights from other Climate Group initiatives, but first up: what’s needed to drive a credible green steel transition in Japan.
Missed SteelZero’s initial reflections video from Tokyo? Check it out here.
On paper, Japan’s steel decarbonisation efforts look promising. Steel sits at the heart of the country’s Green Transformation (GX) strategy and its 2050 carbon neutrality goal. For context, Japan’s GX strategy is the government’s long-term programme to drive emissions reductions across heavy industry through public funding, private investment incentives and sector-specific transition frameworks, including GX Steel for the steel sector.
Financial incentives such as GX Bonds and tax breaks aim to accelerate investment, while policy signals support a shift from blast furnaces to electric arc furnaces.
But as global steel standards and net zero-aligned technology pathways mature, Japan’s approach is facing growing scrutiny, including from its own steel buyers.
This pressure is reshaping expectations of what a credible steel transition looks like in Japan. What once centred on long-term ambition is now being judged on transparency, accountability and leadership from the demand side.
While the steel transition in Japan is taking shape, there are a important few steps to take still.
Local steel buyers are increasingly interested in using lower emission steel to meet their climate targets. What they lack is clarity on the actual emissions intensity of the steel products being sold as “green” or “transition” steel.
Japan’s GX Steel framework, set by the Japan Iron and Steel Federation (JISF), relies on a mass balance crediting approach. This links emissions reduction claims to GX-related investments and certificates, rather than to verified, product-specific emissions reductions associated with the physical steel being purchased.
Buyers are actively encouraged by the government and JISF to adopt GX Steel. But for GX Steel to be a credible alternative, transparency must go beyond high-level investment claims. What good looks like is clear, product-level emissions data, robust disclosure of how reductions are calculated, and accounting methods aligned with stringent international guidelines.
The Japanese government has recently launched a study group examining how green steel data, including emissions information, can be captured and transmitted across the steel supply chain. This is a welcome step. However, without clear guardrails, mass balance systems risk obscuring real emissions performance rather than enabling informed procurement.
If GX Steel is to play a meaningful role in Japan’s transition, it must be underpinned by strong conditions, full transparency and international standards, as outlined in SteelZero’s mass balance position. This is essential to prevent greenwashing and to give buyers confidence that lower emission claims lead to real-world decarbonisation.
Japan’s steel industry needs to clearly show how today’s actions deliver on its 2050 goals.
Yet it continues to promote fossil fuel-intensive steelmaking beyond 2040. GX investments are used to recover economic value without clear evidence of emissions reductions, and there’s a gap between GX Steel premiums and measurable climate impact.
For buyers, two questions remain unanswered: How do GX Steel products drive long-term sector decarbonisation, and how do they deliver real emissions reductions today to support their own climate targets?
To address this, Japan’s steel industry needs to be held accountable for:
Japan needs credible low emission steel definitions and labelling beyond GX Steel. These must be connected to robust international methodologies and standards (for example SBTi), and proven to deliver real cuts in emissions.
Without strong leadership from buyers, Japan’s steel transition will stall. And they are clear on what they need:
To unlock demand, Japan should integrate buyer needs into its definitions, standards and policies around steel, create frameworks that enable buyers to procure steel confidently, and signal that genuinely lower emission steel is possible, at scale.
Japan can lead on net zero steel with strong policy momentum. But leadership depends on delivery. SteelZero will continue to support buyer leadership in 2026, helping to ensure demand drives a credible steel transition in Japan.
You can access the full text of our position paper on mass balance in English and Japanese here.
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