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Hydnum Steel

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Green steel production using non-fossil energy, leading sustainable industrial transformation

Madrid, SpainFounded 2023Energy
Valuation $500M–1B Last recorded · 2026
Headcount <100 Current team size
Total funding $50–100M Disclosed equity funding
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About Hydnum Steel

Hydnum Steel is pioneering the green and sustainable industrial revolution by being one of the first steel plants in Europe to operate entirely on non-fossil energy sources. The company focuses on producing high-quality steel while minimizing its carbon footprint, thereby addressing the significant environmental impact traditionally associated with the steel industry. By progressively replacing coal and natural gas with green hydrogen, Hydnum Steel aims to eliminate CO2 emissions, which account for 9% of global emissions from steel production. The business model revolves around manufacturing eco-friendly steel that is both competitive in quality and respectful of the planet. Hydnum Steel serves industries seeking sustainable materials, contributing to market autonomy and economic development. The project not only supports environmental goals but also creates jobs and fosters economic growth in its community.

Source: Dealroom company data

At a glance

Founded
2023
Headquarters
Madrid, Spain
Sector
Energy

Investors

2 investors on the cap table

From Dealroom's funding and investor records, grouped by the round each investor first entered.

Seed1 investor entered at this stage

  • Government of Spain

Series B and later1 investor entered at this stage

  • Cofides
Team profiled 2 named & role-tagged
Founders Hidden — book a demo/100 quality score
Key operators 2 quality Hidden — book a demo/100
Potential founders Hidden — book a demo likely future founders
Startup mafia Hidden — book a demo alumni-founded startups
Talent movements Hidden — book a demo in · Hidden — book a demo out past 12 months

Source: Dealroom Talent Intelligence.

Global footprint

Workforce and web traffic by country
Workforce by country
🇪🇸 Spain · Madrid HQ
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Market sentiment

Posts on X, past 7 days

An AI-synthesised read of the highest-engagement posts about Hydnum Steel on X, ranked by likes and reposts, corporate channels excluded.

Reading the room on X — pulling top posts and synthesizing themes…

Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour

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