Top 10: Sustainable Energy Companies in Europe
Energy accounts for more than three quarters of total greenhouse gas emissions globally according to the IEA.
The IPCC has acknowledged that to prevent global warming of more than 2°C, the global economy must be largely decarbonised by 2050 â energy included.
Significant progress has been made to decarbonise energy in Europe, but more needs to be done.
Energy Digital, in association with Hansen Technologies, has ranked 10 of the top sustainable energy companies in Europe.
10. Nadara
Headquarters: Milan, Italy
Employees: 1,000
CEO: Toni Volpe
Nadara was formed in 2024 through the combination of Renantis and Ventient Energy.
Climate and Environmental Impact Manager, Ed Flanders, explains: âNadara comes from the Scottish Gaelic word âNĂ darraâ, which means ânaturalâ in English.
âThough inspired by our Scottish roots, we have now evolved into a globally diverse company, taking these traits with us across Europe and beyond.â
It has an installed capacity of 4.2 GW across 199 operational sites and an 18 GW pipeline.
9. Voltalia
Headquarters: Paris, France
Employees: 2,000
CEO: Robert Klein
Voltalia produces and sells electricity from its wind, solar, biomass, hydraulic and storage facilities internationally.
At the end of 2024, the Paris-based company had 3.3 GW of capacity in operation or under construction and a development pipeline of more than 17 GW.
Voltaliaâs projects include the 150 MW Serra Branca in Brazil, the worldâs largest mixed solar and wind cluster.
8. ScottishPower Renewables
Headquarters: Glasgow, Scotland
Employees: 900
CEO: Charlie Jordan
Part of the Iberdrola Group, ScottishPower Renewables operates more than 40 renewable energy sites with more than 3 GW of installed capacity.
Its portfolio includes major offshore wind farms including East Anglia ONE and the under construction East Anglia THREE.
ScottishPower Renewables says that it follows a thorough development process to ensure it is delivering renewable energy responsibly, including significant environmental impact assessments.
7. RES Group
Headquarters: Kings Langley, England
Employees: 4,500
CEO: Eduardo Medina
With more than 40 years of experience in renewable energy, RES Group has delivered more than 27 GW of capacity around the world.
It manages 41 GW of renewable assets across 1,300 sites.
Since 2023, RES has been developing a green hydrogen electrolyser production and storage facility at Kimberly-Clarkâs Northfleet manufacturing facility in Kent.
The company works with clients including Google, Allianz, BlackRock and Aviva.
6. Acciona Energía
Headquarters: Alcobendas, Spain
Employees: 1,800
CEO: Rafael Mateo Alcalá
With 15.4 GW of installed capacity, Acciona EnergĂa has no legacy of fossil fuel technologies and operates exclusively in renewable energy.
It has more than 350 projects across Europe and others in North and South America, Africa, Asia and Oceania.
Acciona EnergĂa says it has avoided more than 14 million tonnes of COâ and has produced 26.7 TWh of renewable energy.
5. EDF Renewables
Headquarters: Nanterre, France
Employees: 4,382
CEO: Béatrice Buffon
A subsidiary of EDF Group, EDF Renewables specialises in the development, construction, operation and maintenance of renewable energy projects.
Its installed capacity of more than 12 GW is primarily wind power, followed by solar and battery storage.
EDF Renewables uses advanced energy technologies, particularly in offshore wind where floating and submerge technology alongside high-capacity turbines are in use.
It has solar energy projects in 13 countries and has announced major investments in electricity storage.
4. Siemens Gamesa
Headquarters: Brande, Denmark
Employees: 28,000
CEO: Vinod Philip
Approximately 1,100 GW of wind power capacity is installed worldwide, and 130 GW of this is from Siemens Gamesa turbines alone.
The company came about through Siemensâ acquisition of Bonus Energy in 2004 and subsequent merger of Gamesa in 2017.
Today, the business is a unit of Siemens Energy and is led by CEO Vinod Philip.
With decades of experience under its belt, Siemens Gamesa is now a team of more than 28,000 individuals over 100 nationalities.
3. Vestas
Headquarters: Aarhus, Denmark
Employees: 30,000
CEO: Henrik Andersen
Wind turbine manufacturer, seller, installer and servicer Vestas is an industry name across the wind and renewables sectors.
Founded in 1945, the business has grown to become the largest wind turbine manufacturer in the world.
Vestas’ roots go back to 1898 with the opening of a blacksmith shop before developing wind turbines in 1977 in response to the oil crisis.
Its first three-blade turbine was introduced in 1978 and it sold its 1,000th turbine in 1991.
2. Ørsted
Headquarters: Fredericia, Denmark
Employees: 8,300
CEO: Rasmus Errboe
Ørsted develops, constructs and operates offshore and onshore wind farms, solar farms, energy storage facilities and bioenergy plants.
The company describes itself as the world’s largest developer of offshore wind power, responsible for around 30% of global capacity outside of mainland China.
Previously one of the most coal intensive energy companies in Europe, Ørsted fully divested its fossil fuel assets by 2017 and has since focussed entirely on renewable energy, including projects like Hornsea 1 and 2 in the UK.
It has installed 10 GW of offshore wind and aims for this to reach between 20 and 22 GW by 2030.
1. Enel Green Power
Headquarters: Rome, Italy
Employees: 7,600
CEO: Salvatore Bernabei
Part of Enel Group, Enel Green Power develops and manages renewable power plants.
It operates more than 1,300 facilities and manages around 66.4 GW of installed renewable capacity.
Annually, its production reached 148.33 TWh across a diverse mix of renewable sources including wind, solar, hydroelectric and geothermal energy.
The company has embedded sustainability and innovation in its business model through a concept it calls âInnovabilityâ, aiming to create shared value and support the UN SDGs.
It says its business development strategy is based on sustainability alongside technological and geographic diversification.
Between 2025 and 2027, Enel Green Power plans to invest âŹ12bn (US$13.9bn) in renewable energy.
