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Italian steel group Marcegaglia commits €1.2 billion to build France's first new steel mill in five decades, targeting 2+ million tonnes of low‑carbon output from 2029 at the former Ascometal site in Fos‑sur‑Mer

Executive summary: Marcegaglia announced a €1.2 billion investment to build the 'Mistral' low‑carbon steel plant at the former Ascometal site in Fos‑sur‑Mer, France, targeting production of over 2 million tonnes per year from 2029. The project is France's first new steel mill in 50 years and a test case for whether green‑steel economics can work under current EU carbon pricing and energy‑cost conditions, with implications for industrial policy and supply‑chain decarbonisation.

Who is involved: Marcegaglia Group (owner), French state and regional authorities (permitting, potential subsidies), EU regulators (ETS, CBAM), and downstream buyers in automotive and construction seeking low‑carbon steel.

Likely next: Permitting and environmental impact studies will advance through 2026‑27; final investment decision hinges on electricity price visibility and potential French/EU green‑industrial support; construction would start around 2027 for 2029 commissioning.

Marcegaglia's 'Mistral' project marks a rare greenfield investment in European primary steelmaking at a time when the sector faces overcapacity, high energy costs and carbon‑border adjustment pressure. The €1.2 billion outlay signals confidence that low‑carbon steel can command a premium in EU markets, especially from automotive and construction buyers needing CBAM‑compliant supply. The plant's location in Fos‑sur‑Mer leverages existing port and industrial infrastructure, but its 2029 start‑up date means the project must navigate permitting, electricity price volatility and the evolving EU ETS framework over the next three years. If delivered, it would add roughly 2 Mt of direct‑reduced‑iron/EAF capacity to a French market that has seen no new integrated mill since the 1970s.

What's next — scenarios

Base: plant reaches FID and starts 2029 (55%)

Adds ~2 Mt/yr of low‑carbon EAF capacity in France, supporting EU green‑steel targets and reducing import reliance.

Upside: accelerated timeline & larger scale (20%)

Capacity expanded to 3 Mt/yr with earlier start‑up (2028) if green‑hydrogen supply and cheaper renewables materialise faster.

Downside: delayed or scaled back (25%)

Project stalls at pilot phase or shrinks to <1 Mt if power costs stay high or permitting drags beyond 2028.

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