For sixty years, a tonne of steel from Central India has been judged on three things: its chemistry, its strength and its price. A fourth line is now being added to that test, and most of the people who buy steel have not noticed yet.
IN BRIEF
India now has an official definition of green steel: under 2.2 tonnes of CO2 per tonne of finished steel, with a three tier star rating below that line.
The average tonne of Indian crude steel carried about 2.54 tonnes of CO2 in 2023 to 24, against a global average of roughly 1.9. On today's average, Indian steel would not earn a single star.
Three pressures are arriving together: a domestic carbon market for 255 steel units, a European border charge that has been live since January, and a planned mandate for green steel in public procurement.
For contractors, fabricators and builders, the practical change is simple to state. The paperwork that travels with a tonne of steel is about to double.
Walk into any steel yard in Durg and ask for the paperwork on a bundle of TMT bars or a stack of plates. Someone will hand you a mill test certificate. It tells you the grade, the chemistry, the yield strength, the elongation and the heat number the material came from.
For as long as anyone in this trade can remember, that single sheet has been the whole story of a tonne of steel. If the numbers on it were right, the steel was right.
That sheet is about to get company. The second certificate will carry one figure that has never mattered to a buyer in this region before: how many tonnes of carbon dioxide went into making the tonne in front of you.
This article explains where that number comes from, why it is arriving faster than most people expect, and what it means for those of us who buy, stock and build with steel rather than make it.
01 A definition, finally
Until December 2024, "green steel" meant whatever the person selling it wanted it to mean. Then the Ministry of Steel published the Taxonomy of Green Steel, and India became the first country to put a hard number on the phrase.
The rule is short. Steel made with an emission intensity below 2.2 tonnes of CO2 equivalent per tonne of finished steel qualifies as green. Below that line sits a star rating: three stars between 2.0 and 2.2, four stars between 1.6 and 2.0, and five stars under 1.6. Anything above 2.2 is not rated at all. The National Institute of Secondary Steel Technology measures, verifies and certifies, issuing greenness certificates every financial year, and the thresholds are reviewed every three years.
That last detail matters more than it looks. A definition that tightens on a schedule is not a badge. It is a specification, and specifications are what end up in tenders.
Sources: Ministry of Steel, Taxonomy of Green Steel (Dec 2024)
02 Where Indian steel actually stands
It is worth being honest about the starting line, because the rest of the argument depends on it.
The average tonne of crude steel produced in India in 2023 to 24 carried about 2.54 tonnes of CO2. The global average was closer to 1.9. The gap is not a mystery: most Indian steel is made through blast furnaces and coal based direct reduced iron, and much of the electricity that runs the mills still comes from coal.
Read plainly, the chart above says that on today's average, Indian steel would not earn even a three star rating. The Ministry has set 2.2 as the sector's target for 2030. That gives the industry roughly four years to move its average from outside the green band to its edge.
We would not call that a crisis. We would call it a direction of travel that is now fixed, measured and public. Buyers who understand that early will make better decisions than buyers who discover it in a tender document.
03 Three pressures, arriving together
Any one of the following could be absorbed quietly. What makes this moment different is that all three are landing within the same two or three years.
The domestic carbon market. In July 2026, draft emission intensity targets for 255 iron and steel units were made public under India's Carbon Credit Trading Scheme, making steel the largest sector in the scheme. Compliance runs from 2026 to 27. Plants that beat their targets earn tradable credits. Plants that miss must buy them, and the draft penalty for falling short is set at twice the average traded credit price. For the first time, a tonne of CO2 has a cost inside an Indian mill's own accounts.
The European border. Since 1 January 2026, the EU's Carbon Border Adjustment Mechanism has been in its definitive phase: importers of steel into Europe must pay for the carbon embedded in it. Estimates of the damage vary. ICRA put the hit to Indian exporters' margins at roughly 60 to 165 dollars a tonne between 2026 and 2034. The think tank Sandbag argued in August that the real impact may be far smaller, and that the cleanest Indian plants could actually gain. Both views agree on the important part: the market now treats a low carbon tonne and a high carbon tonne as different products.
The government as buyer. The Ministry of Steel has said it is working on a mandate for green steel in public procurement, as part of a proposed Green Steel Mission of around 15,000 crore rupees. No date has been fixed. But in a country where public works consume a very large share of all construction steel, a procurement rule would reach every contractor on a government site, not just exporters.
Sources: Ministry of Steel; MoEFCC draft GEI targets (June/July 2026)
04 Bhilai is already measuring
The most telling development for this region came quietly in August 2026. SAIL launched a CO2 dashboard at the Bhilai Steel Plant and at its Chandrapur Ferro Alloy Plant. It tracks daily carbon output at plant level and at the level of individual shops, flags anomalies so teams can act on them, and assesses emissions under the World Steel Association method, the GHG Protocol and the CBAM rules. It is also built to track performance against targets under the carbon trading scheme.
For anyone who buys steel in Central India, this is the part to sit up for. The mill the region depends on is building the instrument that produces the second certificate. The number will exist. The only open question is whether buyers will ask for it, and how soon they will be required to.
05 What changes for the people who buy steel
Most of the conversation about green steel is about mills: hydrogen, scrap, electric arc furnaces, billions in capital. Very little of it is addressed to the contractor in Rajnandgaon or the fabricator in Bhilai's industrial area. Here is what we expect to change on their side of the counter.
The paperwork gets heavier. Expect emission data to travel alongside the mill test certificate, tied to the same heat and batch. Steel that cannot be traced back to a named, measured mill will become harder to use on any project that asks the question.
Source starts to matter again. For years, the market has pushed buyers toward treating steel as interchangeable, judged on price per tonne. Carbon reverses that. A distributor who can trace material to its mill can answer a question that a spot market trader cannot.
Price will begin to split. Early on, rated steel may carry a premium in segments where buyers are under pressure. Over time, the more likely pattern is the reverse: unrated, untraceable steel trading at a discount. Either way, two tonnes with identical chemistry will stop being worth exactly the same.
Good design becomes a carbon tool. The cheapest tonne of CO2 to avoid is the tonne of steel a building never needed. Higher strength grades, careful detailing and less wastage on site cut embodied carbon in direct proportion. A structural engineer who trims eight percent of the steel from a frame trims eight percent of its carbon, and saves money while doing it.
Exporters' suppliers feel it first. Fabricators whose work ends up in European supply chains will be asked for carbon data well before domestic buyers are. If you supply a company that exports, the question is probably closer than you think.
Field names for carbon data will follow the formats NISST and buyers settle on.
06 Why we take this seriously
Lunia Group has distributed steel across Central India since 1982, and has worked with Bhilai Steel Plant for most of that time. Our job has never really been about moving tonnes. It has been about making sure the person at the other end knows exactly what they are getting, and can prove it to whoever inspects the structure afterwards.
Carbon is simply the newest line on that list. We intend to treat it the way we have always treated grade and chemistry: keep material traceable to its source by heat and batch, pass on emission data from the mill as it becomes available, and talk honestly with our customers about what their tenders are likely to ask of them over the next few years.
Our Honest Version
We will not pretend this transition is simple, cheap or fully settled. Some of the rules are still drafts. The star thresholds will move every three years, and probably downward. Estimates of what CBAM really costs disagree by a wide margin, and the procurement mandate has no date yet. Anyone who tells you exactly how this plays out is selling something.
What we can say with confidence is that the direction no longer depends on anyone's opinion. It is written into a taxonomy, a carbon market and a border rule, and it is being measured at the plant down the road.
For sixty years, the question asked of a tonne of steel was whether it was strong enough. The next question is what it cost the air to make it. Both deserve a straight answer, and both will soon be on paper.
