Top 10 European Cleantech Companies 2026

Formerly an oil company, Orsted is now the world's largest offshore wind developer with €40B market cap. It operates 15+ GW of offshore capacity across Europe and the US, and its 2025 Hornsea 3 project in the UK — at 2.85 GW — became the world's largest single offshore wind farm.

The Danish wind giant generates €17B in annual revenue manufacturing and servicing 75,000+ turbines in 88 countries. Vestas' V236-15.0 MW turbine, the world's most powerful, entered serial production in 2025 and can power 20,000 homes from a single unit.

Zurich-based Climeworks operates Mammoth — the world's largest direct air capture plant in Iceland, removing 36,000 tonnes of CO2 per year. With €650M raised through 2025 and partnerships with Microsoft and Stripe, it is scaling toward commercial carbon removal at $300 per tonne by 2030.

Dresden-based Sunfire produces industrial electrolysers for green hydrogen and synthetic fuel generation. Its solid oxide technology achieves 84% efficiency — the highest commercially available. Sunfire secured a €300M contract from the German government in 2025 to supply hydrogen for Ruhr Valley steel plants.

Boden-based H2 Green Steel is building Europe's first full-scale green steel plant using hydrogen from renewables, targeting 5 million tonnes of steel per year by 2030. It raised €4B by 2025, with offtake agreements signed with Mercedes-Benz, Scania, and SSAB covering 100% of initial production.

Mo i Rana-based FREYR builds semi-solid battery cells for grid-scale energy storage using 100% renewable Norwegian hydropower. Its 2025 US Gigafactory deal with Koch Industries values the company at $1.7B, and its Customer Qualification Plant delivered first cells to utility clients in 2024.

Tallinn-based Skeleton Technologies makes graphene-based ultracapacitors for industrial energy storage, achieving 10,000W/kg power density — 10x that of lithium batteries. In 2025 it launched SuperBattery in partnership with Continental, targeting hybrid truck fleets across Europe.

Hamburg-based TES is building a global green hydrogen-to-e-gas infrastructure network, with its Wilhelmshaven import terminal — Europe's first green hydrogen terminal — opening in 2026. It raised €3B from bp, E.ON and EnBW, targeting 15 Mt of green gas supply to Europe by 2030.

Chinese clean energy tech group Envision chose Copenhagen for its European HQ, operating 60 GW of wind turbines and its AICON AI energy management platform across the EU. In 2025 it opened a wind turbine blade factory in Spain, the largest in southern Europe, creating 800 jobs.

Formerly an oil company, Orsted is now the world's largest offshore wind developer with €40B market cap. It operates 15+ GW of offshore capacity across Europe and the US, and its 2025 Hornsea 3 project in the UK — at 2.85 GW — became the world's largest single offshore wind farm.

The Danish wind giant generates €17B in annual revenue manufacturing and servicing 75,000+ turbines in 88 countries. Vestas' V236-15.0 MW turbine, the world's most powerful, entered serial production in 2025 and can power 20,000 homes from a single unit.

Zurich-based Climeworks operates Mammoth — the world's largest direct air capture plant in Iceland, removing 36,000 tonnes of CO2 per year. With €650M raised through 2025 and partnerships with Microsoft and Stripe, it is scaling toward commercial carbon removal at $300 per tonne by 2030.

Dresden-based Sunfire produces industrial electrolysers for green hydrogen and synthetic fuel generation. Its solid oxide technology achieves 84% efficiency — the highest commercially available. Sunfire secured a €300M contract from the German government in 2025 to supply hydrogen for Ruhr Valley steel plants.

Boden-based H2 Green Steel is building Europe's first full-scale green steel plant using hydrogen from renewables, targeting 5 million tonnes of steel per year by 2030. It raised €4B by 2025, with offtake agreements signed with Mercedes-Benz, Scania, and SSAB covering 100% of initial production.

Mo i Rana-based FREYR builds semi-solid battery cells for grid-scale energy storage using 100% renewable Norwegian hydropower. Its 2025 US Gigafactory deal with Koch Industries values the company at $1.7B, and its Customer Qualification Plant delivered first cells to utility clients in 2024.

Tallinn-based Skeleton Technologies makes graphene-based ultracapacitors for industrial energy storage, achieving 10,000W/kg power density — 10x that of lithium batteries. In 2025 it launched SuperBattery in partnership with Continental, targeting hybrid truck fleets across Europe.

Hamburg-based TES is building a global green hydrogen-to-e-gas infrastructure network, with its Wilhelmshaven import terminal — Europe's first green hydrogen terminal — opening in 2026. It raised €3B from bp, E.ON and EnBW, targeting 15 Mt of green gas supply to Europe by 2030.

Chinese clean energy tech group Envision chose Copenhagen for its European HQ, operating 60 GW of wind turbines and its AICON AI energy management platform across the EU. In 2025 it opened a wind turbine blade factory in Spain, the largest in southern Europe, creating 800 jobs.