Tata Steel’s commissioning of a coke oven gas injection project at its Meramandali plant in Odisha is a relatively targeted intervention inside one of the most difficult industrial systems to decarbonise. The project does not replace the blast furnace. Instead, it changes how an integrated steel plant uses a gas already produced during coke-making, directing it back into ironmaking as a reductant and partial substitute for conventional fossil fuels.
That distinction is important. Industrial decarbonisation is often presented through the lens of entirely new production routes, but the Meramandali project points to another pathway: improving the way existing plants use internal materials and energy. Tata Steel says the initiative can reduce fossil-fuel consumption and carbon emissions while allowing the blast furnace to operate with greater fuel flexibility. The available information does not establish the project’s absolute emissions reduction, operating scale or payback period, but it does show how a byproduct gas can be integrated into a conventional steelmaking process rather than burned elsewhere or flared.
Coke oven gas, or COG, is generated when coal is converted into coke for use in blast-furnace operations. According to the company’s account, the gas contains more than 55 per cent hydrogen along with methane and other constituents. In an integrated steel plant, it can be used for power generation, heating or flaring. Tata Steel’s new system takes a portion of that gas through a cleaning process that removes harmful tar and sulphur before sending it through pipes to the blast furnace.
The cleaned gas enters through tuyeres, small nozzles that inject material into the furnace. In this arrangement, hydrogen in the gas performs part of the chemical reduction that would otherwise rely more heavily on carbon. The process also provides heat and reduces the quantity of metallurgical coke or coal required for ironmaking, according to the company. The project was implemented with technology partner Paul Wurth-SMS and equipment supplier Kobelco.
The intervention therefore operates at several levels. It is a waste-to-input conversion within the plant, a fuel-substitution measure and a process adjustment that retains the existing blast-furnace route. Those features help explain why the project has been presented as an operational as well as an environmental development. The company says the arrangement creates the possibility of a three-fuel system for the blast furnace, improving operational flexibility alongside resource efficiency.
For an integrated steel plant, this internal circularity matters because the production chain generates several gases and solid materials that can either be used within the facility or become sources of additional energy loss and emissions. COG is not an externally purchased clean fuel. It is already present in the plant’s process system. The challenge is to clean it sufficiently, control its composition and deliver it to the furnace in a way that does not compromise production or safety.
That makes the project different from a simple fuel-switching exercise. The gas must first be prepared for injection. Tar and sulphur removal are necessary because untreated contaminants can affect equipment, process stability and emissions performance. The gas then has to be transported to the furnace and introduced through the tuyeres. Each step requires coordination between the coke ovens, gas-cleaning equipment, pipelines, injection systems and blast-furnace controls.
The supplied material does not provide the project’s injection rate, annual gas utilisation, capital cost or measured reduction in tonnes of carbon dioxide. Those omissions limit the extent to which the project’s climate performance can yet be assessed from the available evidence. Commissioning demonstrates that the technology has been implemented, but it does not by itself establish the scale of emissions reduction achieved during sustained commercial operation.
What the project does establish is a technical route for reducing dependence on conventional fossil inputs without immediately rebuilding the entire ironmaking system. Blast furnaces depend on coke and injected fossil fuels to provide both heat and reducing gases. Replacing part of those inputs with internally generated process gas can lower the amount of carbon-intensive material required for the same broad production pathway. The company describes this as a way to lower the carbon intensity of ironmaking while improving the use of resources already generated at the plant.
The approach reflects the complexity of steel-sector decarbonisation. Steel demand is served today by large installed assets, and those assets are built around tightly connected processes. A coke oven produces coke; the blast furnace uses coke and other fuels to convert iron ore into hot metal; gases generated during production move through the plant’s energy system. Changing one stream can affect the balance of several others. An intervention that works within the existing configuration may therefore be easier to deploy than one requiring a complete transition to a different production technology, although the supplied material does not establish how the project compares with alternative decarbonisation routes.
Tata Steel’s Meramandali facility is located in Odisha’s Dhenkanal district and is described by the company as one of India’s leading integrated steel manufacturing facilities and the country’s largest producer of auto-grade steel. The plant was formerly known as Bhushan Steel and became part of Tata Steel after the acquisition by Bamnipal Steel, a wholly owned subsidiary, in 2018. That history places the project within a larger story of industrial restructuring, capacity consolidation and technology investment at an operating plant rather than at a greenfield site.
This operating context is relevant. Tata Steel is pursuing decarbonisation alongside capacity expansion and other technology investments across its operations. In the financial year cited in the report, the company recorded consolidated carbon dioxide emission intensity of 2.22 tonnes per tonne of crude steel and reported research and development expenditure of ₹1,456 crore. These figures provide corporate context, but they do not isolate the effect of the Meramandali project. The reported group-wide intensity cannot be treated as a before-and-after measure for coke oven gas injection.
The company’s stated net-zero target is 2045. Subodh Pandey, vice-president for technology, research and development, new materials and graphene, said the project would improve resource efficiency while lowering the carbon intensity of ironmaking by using COG as a reductant and partial substitute for conventional fossil fuels. Sudhir Kumar Mehta, vice-president for operations at Tata Steel Meramandali, described the initiative as part of efforts to make operations leaner and cleaner through productive use of coke oven gas within the blast-furnace process.
Those statements define the project’s immediate policy and corporate logic: reduce emissions from an existing industrial route, lower fossil-fuel consumption and make greater use of internally generated gases. They do not, however, amount to a complete decarbonisation strategy. The process continues to rely on the blast furnace, coke-making and carbon-based reduction. It is best understood as an efficiency and substitution measure within the conventional system, not as evidence that the system itself has been replaced.
The project also raises questions about how industrial emissions should be measured. A reduction in fossil-fuel use may lower direct emissions, but the outcome depends on the gas composition, the quantity injected, the emissions associated with cleaning and compression, and the effect on coke consumption and furnace performance. The supplied report confirms the direction of the intervention but does not provide the operational data needed to evaluate its full lifecycle impact.
For policymakers and industrial planners, that measurement gap is significant. Announcements of new process technologies are most useful when followed by transparent reporting on operating performance. Relevant indicators would include the volume of COG injected, the quantity of coke or coal displaced, changes in furnace productivity, energy consumption, emissions intensity and the duration over which the system operates reliably. None of those project-level figures is included in the supplied material, so the next stage of scrutiny will depend on future disclosures or official technical documentation.
The Meramandali project nevertheless illustrates a broader urban and infrastructure question. Cities depend on steel for buildings, transport systems, utilities, industrial facilities and other physical networks, even when the emissions from steelmaking occur far from the final construction site. Decarbonising the built environment therefore involves not only the energy used in buildings or vehicles, but also the industrial processes that produce their structural materials.
This link makes process-level changes inside steel plants relevant to urban policy. A reduction in the carbon intensity of steel could eventually affect the embodied emissions of construction and infrastructure, but the available evidence does not quantify such an outcome for this project. The immediate, documented effect is confined to Tata Steel’s Meramandali operation and its use of coke oven gas in the blast furnace.
The central lesson is narrower and more practical. Industrial decarbonisation can proceed through modifications to existing systems, particularly where plants already generate gases that can be cleaned and reused. Such interventions may reduce fuel consumption and improve flexibility, but their importance must be judged through measured performance rather than commissioning claims alone. Tata Steel’s project marks the installation of a new process at Meramandali; the remaining question is how consistently and at what scale it delivers the promised resource and emissions benefits.
