Scrap-EAF vs BF-BOF: The Reline-Retire-Retool Decision Every Indian Steel CFO Must Make
India's blast furnaces are ageing. When a furnace reaches the end of its campaign, the decision to reline, retire, or retool toward EAF is no longer just a technical one; it represents a carbon compliance, trade competitiveness, and capital allocation decision simultaneously. At current CBAM costs and coking coal prices, the arithmetic has fundamentally shifted.
Key Takeaways
- India operates approximately 50 to 60 blast furnaces across integrated steel plants, with an average campaign age exceeding 20 years and a significant proportion approaching or past their scheduled reline windows. A blast furnace reline, which involves replacing the refractory lining at the end of a campaign, costs Rs 800 to 1,200 crore for a large furnace and extends operational life by 12 to 15 years. Every reline decision is therefore a 12 to 15 year lock-in on BF-BOF production economics and BF-BOF carbon intensity.
- The financial case for relining versus retooling to EAF has shifted materially since 2022 for three compounding reasons. First, coking coal prices rose from approximately $150 per tonne to $250 to $300 per tonne during 2021 to 2022 and have remained elevated, with freight costs adding a further 30 to 40 percent premium during the West Asia War. Second, CBAM since January 2026 puts a direct financial penalty on BF-BOF's high Scope 1 embedded emission intensity of approximately 2.1 to 2.3 tCO₂ per tonne relative to the EU benchmark. Third, CCTS GEI targets, once notified for steel, will create annual compliance costs for BF-BOF plants that EAF plants will avoid or reverse.
- A scrap-EAF conversion for a 1 MTPA capacity increment requires a capital investment of approximately Rs 2,500 to 4,000 crore, which is significantly more than a blast furnace reline. However, the operating cost differential, CBAM cost avoidance, and CCTS compliance revenue transform the economics over a 15-year asset life. At current prices, the EAF route generates approximately Rs 25,000 to 40,000 crore in cumulative operating cost and carbon cost savings over 15 years relative to a relining BF-BOF, against the Rs 1,700 to 2,800 crore incremental capital cost of choosing EAF over reline.
- India's domestic scrap availability is the binding constraint on EAF expansion. India generates approximately 28 to 35 million tonnes of scrap per year, which is sufficient to support approximately 35 to 45 million tonnes of EAF production annually, against an existing EAF fleet capacity of approximately 50 to 55 million tonnes. The scrap balance is already stretched, and large-scale BF to EAF conversion would require either scrap imports or DRI substitution to fill the gap. DRI from natural gas or green hydrogen enables EAF production without scrap dependency, effectively shifting the constraint from domestic scrap availability to hydrogen feedstock availability.
- The decision is not binary for all plants. Large integrated plants with 4 to 6 million tonnes of annual BF-BOF capacity and captive iron ore mines face different economics than standalone 1 to 2 million tonne converters. Captive ore mines make BF-BOF more defensible because the iron ore cost is below market, reducing the raw material cost premium of the BF-BOF route. The reline case is strongest for these captive-ore integrated players. The EAF/DRI case is strongest for standalone converters that buy iron ore at market prices and face the full coking coal cost.
- The Green Steel Taxonomy (Gazette 763E, BIS IS 18032:2023) and the government's green procurement preference create a revenue premium for taxonomy-certified producers that is not available to plants that reline and remain in BF-BOF without a credible transition plan. A BF-BOF reline without taxonomy alignment is a capital investment in a non-premium-priced asset class, meaning it will face progressively tighter CBAM costs, higher CCTS compliance costs, and lower government procurement access through the 2030s.
India produced 149 to 150 million tonnes of crude steel in FY 2025-26, solidifying its place as the world's second-largest steel producer. Roughly 77 percent of that output came from the integrated blast furnace-basic oxygen furnace route, a dominant share that reflects both historical investments in integrated steelmaking infrastructure and the structural limits of India's domestic scrap availability. The BF-BOF route is not inherently inferior to EAF when it comes to flat steel product quality. What has changed, with uncomfortable speed since 2022, is the operating cost environment and the carbon compliance cost burden of the BF-BOF route, both of which have moved decisively against reline decisions and in favour of retooling.
This reline-retire-retool choice is not an abstract case study. It is playing out in real time at India's major integrated steel hubs. SAIL's Bhilai Steel Plant, JSW's Vijayanagar complex, Tata Steel's Jamshedpur facility, and RINL's Vizag plant all operate blast furnaces that have completed or are fast approaching their current campaign lives. Each of those decisions, worth Rs 800 to 1,200 crore individually and collectively responsible for determining the carbon intensity of hundreds of millions of tonnes of annual steel production over the next decade and a half, is being made in a cost landscape that looks entirely different from the 2008 to 2015 era when the last major relines were approved.
The operating cost comparison: what has changed since 2022
The BF-BOF operating cost structure depends heavily on three variable cost components: iron ore, coking coal, and electricity for auxiliary operations. Conversely, EAF operating costs are dominated by scrap or DRI input costs, electricity for steelmaking, and electrode costs. The relative economics of the two routes hinge primarily on the coking coal versus scrap/electricity cost relationship, which has been highly volatile since 2021.
Iron ore (0.65t/t steel × Rs 5,500/t): Rs 3,575
Coking coal (0.52t/t × Rs 20,000/t including freight premium): Rs 10,400
Other inputs (limestone, dolomite, refractories): Rs 1,200
Electricity (grid, auxiliary): Rs 800
Labour, maintenance, overheads: Rs 2,500
Total BF-BOF: ~Rs 18,475 per tonne
Scrap-EAF Operating Cost per tonne:
Scrap (1.1t/t × Rs 28,000/t, domestic HMS-1): Rs 30,800
Electricity (400 kWh × Rs 6/unit): Rs 2,400
Electrodes, refractories, alloys: Rs 1,800
Labour, maintenance, overheads: Rs 1,800
Total Scrap-EAF: ~Rs 36,800 per tonne
EAF PREMIUM over BF-BOF (operating): ~Rs 18,325 per tonne at current scrap prices
BUT: EAF avoids a CBAM cost of ~€60 to 80 per tonne (~Rs 5,400 to 7,200/t) on EU exports
AND: EAF avoids CCTS compliance costs (estimated at Rs 1,500 to 4,000/t once GEI targets are set)
AND: EAF scrap input qualifies for Green Steel Taxonomy Tier 2+ which unlocks a green procurement premium of Rs 2,000 to 4,000/t
A raw look at operating costs appears to favour the BF-BOF route by roughly Rs 18,325 per tonne, a significant baseline advantage. However, this comparison is deeply misleading in today's regulatory environment for three reasons. First, the CBAM cost for EU-exported BF-BOF steel stands at approximately €60 to 80 per tonne and is set to climb as EU ETS prices rise and free allocations phase out. This is a liability that EAF-scrap steel entirely avoids because its Scope 1 emission intensity is around 0.3 to 0.8 tCO₂ per tonne compared to BF-BOF's heavy 2.1 to 2.3 tCO₂ per tonne. Second, the CCTS GEI compliance cost, once steel GEI targets are formally notified, will add Rs 1,500 to 4,000 per tonne to BF-BOF operating expenses for plants missing their targets, while generating positive CCC revenue for EAF plants that over-perform. Third, the green procurement premium available to taxonomy-certified EAF producers effectively closes a further Rs 2,000 to 4,000 per tonne of that apparent operating cost gap.
BF-BOF Reline: The Cost Profile Through 2040
EAF Retooling: The Cost Profile Through 2040
The 15-year NPV: where the economics actually land
The economically correct frame for the reline-versus-retool choice is a 15-year net present value comparison that captures all cash flows, capital, operating expenses, CBAM liabilities, CCTS compliance costs or revenues, and green premium revenues, over the full asset lifespan that either decision implies. This is the exact lens that a steel company CFO needs to use, even though engineering-focused reline evaluations routinely leave it out.
| Cash Flow Item | BF-BOF Reline (15 yr) | Scrap-EAF Retool (15 yr) | EAF Advantage |
|---|---|---|---|
| Upfront capital (nominal) | Rs 1,000 cr | Rs 3,250 cr | BF-BOF saves Rs 2,250 cr upfront |
| Coking coal cost premium vs scrap-EAF (cumulative) | Paid in full | EAF saves ~Rs 5,000 to 8,000 cr over 15 yr at 1 MMT/yr | EAF saves Rs 5,000 to 8,000 cr |
| CBAM liability (EU exports, 15 yr, rising EU ETS) | Rs 8,000 to 15,000 cr est. | Rs 500 to 1,500 cr est. | EAF saves Rs 7,500 to 13,500 cr |
| CCTS compliance cost (net of CCC revenue) | Rs 2,000 to 5,000 cr (buyer) | Rs 0 to –Rs 2,000 cr (seller) | EAF saves/earns Rs 2,000 to 7,000 cr |
| Green steel premium revenue (procurement + market) | Rs 0 to 1,500 cr (Tier 1 only) | Rs 6,000 to 12,000 cr (Tier 2/3) | EAF captures Rs 4,500 to 10,500 cr |
| Scrap cost premium vs BF-BOF iron ore + coke | Baseline pricing | EAF pays Rs 3,000 to 6,000 cr more for scrap | BF-BOF saves Rs 3,000 to 6,000 cr |
| Net 15-year cumulative advantage (EAF over BF-BOF) | Rs 16,000 to 33,000 cr per 1 MTPA | ||
The NPV comparison is clear. Despite the higher upfront capital required for EAF retooling relative to a BF-BOF reline, the cumulative 15-year advantage of EAF is estimated at Rs 16,000 to 33,000 crore per million tonne of capacity based on current CBAM costs, CCTS trajectories, and market prices. This range is wide because the dominant variables are the CBAM trajectory, which tracks volatile EU ETS prices, and the CCTS compliance cost, which hinges on exact steel GEI target stringencies. Yet, even under highly conservative assumptions, such as an EU ETS flatlining at €60 per tonne and CCTS compliance costs landing at the lower end, the EAF route's financial advantage over 15 years comfortably outpaces the incremental capital cost of choosing retooling over a standard reline.
The scrap availability constraint that changes the EAF calculus for large integrated players.
For a SAIL or JSW plant running 4 to 6 MTPA of BF-BOF capacity, converting entirely to scrap-EAF would demand 4.4 to 6.6 million tonnes of scrap annually, which represents roughly 13 to 20 percent of India's entire domestic scrap supply. This is physically impossible at current national scrap volumes. The realistic pathway for large integrated operations is a hybrid strategy. Companies can deploy DRI-EAF for new capacity increments using natural gas, moving to green hydrogen as it scales up, while reserving scrap-EAF for smaller specialty steel capacity where local scrap sourcing is viable. Concurrently, they can continue running the existing BF-BOF fleet backed by renewable electricity to clean up Scope 2 GEI numbers and move up the Green Steel Taxonomy tiers until a full primary transition becomes viable. The reline choice, for these massive assets, is not a simple choice between relining and scrap-EAF. It is a choice between relining and a dynamic DRI-EAF hybrid, which shifts both the capital cost profile and the raw material supply picture entirely.
Frequently Asked Questions
What is a blast furnace reline and why does it matter for decarbonisation?
A blast furnace reline involves replacing the worn refractory brick lining inside the furnace at the end of its operational campaign, which typically occurs every 12 to 20 years. Relining a large furnace costs Rs 800 to 1,200 crore and effectively locks the plant into another 12 to 15 years of BF-BOF production. Because of this, a reline decision taken today commits the plant to historical BF-BOF production structures, escalating CBAM liabilities, and tightening CCTS compliance costs through roughly 2038 to 2041, deep into the decade when global carbon penalties will be at their peak.
Is India's domestic scrap supply sufficient to support large-scale EAF expansion?
India generates about 28 to 35 million tonnes of steel scrap annually, a figure rising by roughly 5 to 7 percent each year as older steel assets reach retirement. While this easily supports 35 to 45 million tonnes of EAF production, India's existing EAF fleet capacity already hovers around 50 to 55 million tonnes, making the domestic scrap balance incredibly tight. Any large-scale conversion of existing primary BF-BOF capacity to EAF would require either substantial scrap imports or substituting scrap with DRI produced from natural gas or green hydrogen. This DRI-EAF route is the most realistic long-term pathway for India's primary integrated steelmakers.
How does CBAM affect the reline-versus-retool decision?
CBAM for the steel sector covers direct Scope 1 emissions only. A typical Indian BF-BOF setup operates at a Scope 1 emission intensity of 2.1 to 2.3 tCO₂ per tonne, which sits roughly 54 percent above the current EU benchmark intensity. This gap triggers a significant CBAM certificate liability of about €60 to 80 per tonne of steel exported to the EU based on recent EU ETS prices. In contrast, scrap-EAF operations feature a minimal Scope 1 footprint of 0.3 to 0.8 tCO₂ per tonne, landing below or near the EU benchmark and keeping CBAM exposure nominal. Over a 15-year asset life with disappearing EU free allocations, this carbon cost delta acts as one of the largest financial drivers of the EAF route's NPV advantage.
Which Indian steel companies are facing reline decisions in the next 2 to 5 years?
Based on historical commissioning dates and typical campaign lifespans, several SAIL blast furnaces at Bhilai, Durgapur, and Rourkela are entering the 20 to 25 year age window that traditionally triggers reline reviews. Similarly, JSW Steel's Vijayanagar complex operates furnaces from the early 2000s that are nearing their reline campaign limits, as does RINL's Vizag facility. This concentrated wave of upcoming decisions between 2026 and 2030 means the current window is analytically critical for setting the trajectory of Indian steel production costs and carbon intensities through the next decade.
- World Steel Association, Steel Statistical Yearbook: Production routes and global emission intensities
- Ministry of Steel, Green Steel Taxonomy: Gazette Notification 763E and BIS IS 18032:2023 Guidelines
- European Commission, CBAM Regulation: Official steel benchmark intensities and transitional certificate pricing rules
- NITI Aayog, India Steel Decarbonisation Roadmap: Strategic technology pathways and industry cost curves
- SAIL, JSW Steel, and Tata Steel, Annual Operational Reports: Blast furnace asset logs and corporate capex plans
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CBAM and Indian Steel: What the Carbon Levy Actually Costs and How to Respond India's Green Steel Taxonomy: What Gazette 763E Requires for Steel Producers India's CCTS Explained CBAM Downstream Expansion 2028: What India Must Do Now India's Climate Finance Taxonomy: Which Industrial Assets Qualify