For much of the last decade, the debate around low-emission steel has centred on two simple questions: how should low-emission steel be defined, and will customers pay a premium for it?

The answers have often been disappointingly unclear for steelmakers investing in decarbonisation. While demand for lower-carbon materials has grown, voluntary purchasing commitments have generally not been sufficient to justify the scale of investment required to transform one of the world's most emissions-intensive industries.  Sustainability has increasingly become part of procurement discussions, but cost, quality and availability have remained the dominant decision-making factors.  At the same time, there has been a proliferation of claims relating to low-emission steel, schemes to measure and allocate emissions, an evolution of standards, with regulation lagging behind.

The World Steel Association's latest release of Life Cycle Inventory (LCI) data and eco-profiles arrives at a pivotal moment for the sector. Drawing on data from 169 steel production sites across 34 companies worldwide, the updated dataset provides refreshed environmental performance information for a wide range of steel products and production routes.

At first glance, this appears to be a technical update. In reality, it co-incides with a much broader transition taking place across the steel value chain: carbon intensity data is becoming commercially consequential.

The green premium debate

One of the biggest challenges facing steel decarbonisation has been the gap between ambition and purchasing behaviour.  Many organisations have set net-zero targets and made public commitments to reducing supply chain emissions. Yet when procurement decisions are made, willingness to pay materially higher prices for lower-emission steel has often been limited.

That reality has led many commentators to question whether market demand alone can drive the transformation required to achieve deep industrial decarbonisation.  Can regulation do what voluntary demand has not?

The introduction of the EU Carbon Border Adjustment Mechanism (CBAM) is changing the economics of carbon-intensive materials. For steel producers, importers and downstream manufacturers, embedded emissions are becoming directly linked to compliance obligations, reporting requirements and ultimately competitiveness.

In this context, the "green premium" starts to look less like an optional extra and more like part of the cost of maintaining market access.

Carbon accounting as part of market differentiation

The new Worldsteel LCI release comes at a time of transition towards differentiated markets for lower-emission materials.  Across Europe, policymakers are developing mechanisms that increasingly use environmental performance data to distinguish between products.

Alongside CBAM, the Ecodesign for Sustainable Products Regulation (ESPR) and the introduction of Digital Product Passports have the potential to create the foundations for a more transparent and data-driven marketplace. These initiatives are designed not simply to measure emissions but to make environmental performance visible and comparable across products and supply chains.

According to Worlsteel data, on a global basis a tonne of hot rolled coil steel produced using a conventional blast furnace route has a carbon intensity of 2.34 tCO2e/tonne, whereas a tonne produced using scrap-based electric arc furnaces has a carbon intensity of 0.69 tCO2e/tonne. Yet historically, the market has often struggled to recognise and reward those differences consistently.  For lower-emission steel to create commercial value, those differences need to be measurable, visible and trusted.

Differentiation requires credible benchmarks

For lower-emission steel to create commercial value, those differences need to be measurable, visible and trusted.

Industry initiatives such as ResponsibleSteel are helping establish common approaches for communicating and classifying emissions performance, while policymakers are increasingly seeking to embed similar principles within regulation.

This issue sits at the heart of the recent position statement published by the Low Emission Steel Standard (LESS) initiative regarding the forthcoming ESPR delegated act for steel products.

The coalition argues that Europe's emerging product sustainability framework should establish meaningful performance classes that clearly distinguish genuinely low-emission steel from conventional production routes. Their concern is straightforward: if classification thresholds are set too broadly, products with significantly different carbon footprints risk being grouped together, weakening the market signals needed to encourage investment in decarbonisation.

For manufacturers investing heavily in lower-carbon production routes, credible differentiation matters. Without robust methodologies and transparent benchmarks, there is a risk that genuine emissions reductions become difficult to distinguish from marginal improvements or methodological differences.

Communicating carbon performance credibly

As steel emissions data becomes more important to procurement decisions, reporting obligations and regulatory compliance, producers face a related challenge: how do they communicate carbon performance in a way that customers can trust and compare?

This is where industry standards and certification schemes have an increasingly important role to play.

While datasets such as the worldsteel LCI database provide essential foundations for life cycle assessment and carbon footprinting, customers increasingly want evidence of how individual facilities and products perform. They also want confidence that claims regarding emissions reductions have been assessed against recognised methodologies and subject to independent scrutiny.

The ResponsibleSteel Standard provides one example of how the industry is responding to this challenge.  Alongside its broader requirements covering environmental, social and governance performance, ResponsibleSteel has developed approaches for reporting and classifying steel production according to emissions intensity. This provides producers with a structured framework for communicating progress on decarbonisation and enables customers to better understand the carbon performance associated with different steelmaking routes and facilities.

Importantly, schemes such as ResponsibleSteel help move the conversation beyond broad sustainability claims towards more transparent and comparable disclosures. In a market increasingly shaped by carbon performance, the ability to communicate emissions intensity consistently and credibly becomes an important part of demonstrating value to customers.

Assurance turns data into commercial value

Lower-emission steel only creates competitive advantage if the market can reliably distinguish it from higher-emissions alternatives.  That distinction depends on trust.

As performance classifications, Digital Product Passports, procurement requirements and carbon reporting obligations become increasingly interconnected, confidence in emissions data becomes critical.

Through our work providing independent assurance of steel emissions data, we see first-hand the growing importance of verification in supporting this transition.

Whether emissions information is being used for CBAM reporting, Scope 3 disclosures, product carbon footprints, Environmental Product Declarations or certification schemes such as ResponsibleSteel, confidence in the underlying data is essential. The value of lower-emission steel increasingly depends not only on reducing emissions but on demonstrating those reductions through robust and independently verified information.

Recognising progress, not just end states

One of the challenges in creating markets for lower-emission steel is avoiding a binary distinction between "green" and "not green".

Steel decarbonisation will occur over decades, requiring substantial investment in new technologies, infrastructure and energy systems. While some production routes can already achieve significantly lower emissions than industry averages, many producers are pursuing phased decarbonisation strategies that deliver incremental improvements over time.

Initiatives such as the ResponsibleSteel International Production Standard have introduced emissions intensity thresholds and Progress Levels that allow producers to demonstrate where individual sites sit on their decarbonisation journey. Rather than focusing solely on a final destination, the framework enables steelmakers to communicate verified improvements in emissions performance over time and provides customers with a clearer understanding of relative carbon performance.

There is now a growing recognition that credible transition pathways matter.  It is no longer sufficient to have emissions reductions targets, ultimately leading towards a net zero goal.  These must be supported by decarbonisation steps, backed by financial commitments, to demonstrate how progress steps will be achieved.

The future value of low-emission steel

The steel sector remains at the beginning of a long and complex decarbonisation journey.

Cost will continue to matter. Competitive pressures will remain intense. Many buyers will still face difficult decisions when balancing sustainability ambitions against commercial realities.

Regulation and standards have the potential to create the conditions for carbon performance to influence competitiveness directly.  CBAM, Scope 3 disclosure requirements, ESPR performance classes and Digital Product Passports are collectively building a framework in which emissions intensity becomes an increasingly important characteristic of the product itself.

Better emissions data enables better carbon accounting, but it also supports something more fundamental: the ability to distinguish, verify and reward lower-emission steel within the marketplace. Together, initiatives such as ResponsibleSteel, emerging regulatory frameworks including CBAM and ESPR, and increasingly sophisticated carbon accounting methodologies are creating the foundations of a market where emissions performance can be compared more consistently and communicated more credibly.

The organisations that succeed are likely to be those that not only reduce emissions, but can demonstrate progress through robust, transparent and assured data. As carbon performance becomes increasingly linked to procurement decisions and market access, trusted evidence of decarbonisation progress and fully-financed investment plans, are becoming key to credibility.