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ArcelorMittal powers Spanish rolling mill with 100% green hydrogen

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Construction 18 Nov 2025 04:22 PM IST Business Standard

ArcelorMittal has begun using 100 per cent green hydrogen to heat furnaces at its Olaberria rolling mill in Spain, marking a significant step in decarbonising downstream steel operations. The project replaces natural gas-fired reheating furnaces with a hydrogen-only combustion system, designed and installed by Spanish engineering firm Sarralle in partnership with Nippon Gases.

The new oxy-fuel burners are capable of operating entirely on green hydrogen, with water vapour as the only combustion by-product. This eliminates direct CO₂ emissions from one of the most energy-intensive stages in the rolling process, where steel billets and beams must be brought to very high temperatures before shaping. According to Sarralle, the technology demonstrates that hydrogen can be deployed at industrial scale in existing steel mills without compromising performance.

Olaberria processes scrap into structural sections and construction steel, making the plant a showcase for combining circular raw materials with low-carbon process heat. Industry observers see the project as a practical bridge technology: it enables deep cuts in emissions from reheating and rolling today, while more complex hydrogen-based direct reduction routes for primary ironmaking are still being scaled up.

ArcelorMittal’s move also aligns with broader European efforts to expand green hydrogen supply and infrastructure, positioning the company to tap emerging green steel demand from construction and infrastructure customers.