Steel making produces about 8 percent of global CO2 emissions, more than aviation and shipping combined. Green steel replaces coal with hydrogen or electricity. This guide covers the technology, leading projects, and outlook for decarbonising the world largest industrial emitter.
Why steel is hard to decarbonise
Traditional integrated steel making uses coal (as coke) both as fuel and as chemical reductant in blast furnaces. About 1.85 tonnes CO2 per tonne of steel produced this way. Global steel demand still growing. Blast furnaces last 40 to 60 years so replacement is capital intensive.
Two paths to green steel
| Route | Notes |
|---|---|
| Hydrogen Direct Reduction (H-DRI) | Replaces coal with hydrogen as reductant |
| Electric Arc Furnace (EAF) with scrap | Recycles existing steel using electricity |
Hydrogen direct reduction
Uses green hydrogen instead of coal to reduce iron ore to metallic iron. Product (called sponge iron or DRI) then melted in electric arc furnace to produce steel. When powered by renewable electricity plus green hydrogen, emissions can be under 100 kg CO2 per tonne (95+ percent reduction).
Scrap plus EAF
Existing steel scrap recycled in electric arc furnace. Well established technology (produces about 30 percent of global steel today). Powered by grid electricity so carbon intensity depends on grid mix. Very low if grid is clean.
Major green steel projects
| Project | Location | Status |
|---|---|---|
| H2 Green Steel Boden | Sweden | Under construction; first steel 2025-2026 |
| HYBRIT (SSAB/LKAB/Vattenfall) | Sweden | Pilot to commercial transition |
| ThyssenKrupp tkH2Steel | Germany | Large commercial project |
| ArcelorMittal Sestao | Spain | Green H-DRI plant planned |
| Salzgitter SALCOS | Germany | Multi phase transition |
| voestalpine H2FUTURE | Austria | Pilot plant operating |
| Boston Metal | US | Molten oxide electrolysis pilot |
| Nucor | US | Scrap plus EAF expansion |
HYBRIT: the pioneer
Swedish joint venture between SSAB (steel), LKAB (iron ore), and Vattenfall (utility). Produced world first fossil free steel in 2021. Commercial scale up ongoing. Combined leadership across value chain and Nordic clean grid enabled early success.
H2 Green Steel: the disruptor
Startup building 2.5 million tonne per year plant in northern Sweden. First shipment 2025-2026. Long term offtake contracts with Mercedes Benz, BMW, ZF, others. Demonstrates independent developer path (versus incumbent steel makers).
Cost economics
Willingness to pay premium
Automotive premium buyers (Mercedes Benz, BMW, Volvo, Ford) pay green steel premium visibly. Construction, appliance, and machinery buyers less so. Premium tolerance USD 100 to 200 per tonne typical.
Policy support
- US IRA 45V hydrogen credit supports H-DRI feedstock.
- EU Innovation Fund grants for green steel projects.
- EU ETS pricing on carbon disadvantages fossil steel.
- CBAM (EU Carbon Border Adjustment Mechanism) equalises imports.
- UK Clean Steel Fund.
- Germany decarbonisation contracts.
CBAM impact
Hydrogen supply constraint
Green steel is a major green hydrogen consumer. H2 Green Steel needs about 400 kt hydrogen annually. Multi million tonne green steel deployment requires massive green hydrogen production. See our companion article on green hydrogen.
China context
China produces over half of global steel. Chinese green steel investment growing but slower than European. China GEIDCO steel decarbonisation plan. Chinese production also increasingly EAF based.
US context
US steel industry roughly 70 percent EAF (recycled) already. Nucor is largest EAF producer. Growing focus on scaling green primary steel. US Steel and Cleveland Cliffs modernising blast furnaces with H-DRI potential.
Contemporary challenges
- Green hydrogen supply constraint.
- Cost premium versus willingness to pay.
- Capital intensity of transition.
- Iron ore quality requirements.
- Grid access for large loads.
- Workforce transition.
- Global market equalisation.
Aviation vs steel decarbonisation
Steel has clearer path than some other hard to abate sectors. H-DRI is proven technology. Scrap plus EAF already scaled. Aviation SAF pathways still emerging. Cement and chemicals harder still.
Where green steel is going
- First large H-DRI plants commissioning 2025 to 2027.
- H2 Green Steel commercial production 2025-2026.
- Cost reduction with scale.
- CBAM full implementation 2026.
- Growing corporate procurement.
- China H-DRI deployment.
- Recycling infrastructure expansion.
Frequently asked questions
What is green steel?
Steel produced with 90+ percent CO2 reduction versus conventional.
How is it made?
Hydrogen direct reduction or recycled scrap in electric arc furnace.
Is it commercial?
Emerging. H2 Green Steel first commercial 2025-2026.
Does it cost more?
Yes 20 to 40 percent premium currently.
Who buys it?
Automotive OEMs mostly. Growing construction adoption.
What is CBAM?
EU carbon border tariff on imported steel from non regulated regions.
Is scrap steel green?
Yes very low emissions if EAF powered by clean grid.
Can China go green?
Investment growing but slower than Europe.
How much hydrogen needed?
About 55 kg per tonne of steel.
Where can I read more?
Mission Possible Partnership, World Steel Association, ArcelorMittal reports.
Summary
Green steel is emerging through hydrogen direct reduction and scrap plus electric arc furnace routes. HYBRIT proved the pathway; H2 Green Steel and others commercialising. Cost premium 20 to 40 percent currently but falling. EU CBAM and automotive procurement drive demand. Green hydrogen supply is the main constraint on scale. Steel industry has clearer decarbonisation path than aviation or cement. First large green steel plants operating 2025 to 2027.
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