Discover the most influential companies driving the transformation towards a more sustainable future in Spain. This list highlights key players in renewable energy development, from solar and wind power to green hydrogen. Explore their innovative projects and their impact on the Spanish energy market, a constantly growing sector attractive to global investors. Get to know the leaders setting the pace in the country's decarbonisation and energy efficiency efforts.
Boosts strategic plan investment for energy transition
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Endesa has strengthened its commitment to clean energy, allocating a record investment of 9.6 billion euros in its 2025-2027 Strategic Plan for energy transition. This plan includes a 30% growth in its renewable energy park, reaching 11,500 MW, and a substantial improvement of distribution grids to facilitate the decarbonization of the Spanish energy mix.
Leading energy marketer in Spain
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Naturgy has invested significantly in its networks and renewables businesses, which are key pillars for driving the energy transition in Spain. The company contributed 10,797 GWh of renewable energy to the Spanish electricity system last year, representing an 11% increase.
Spearheading energy transition for 20 years
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Iberdrola has invested 75 billion euros through 2025 in the energy transition, with a significant focus on offshore and onshore wind power, and energy storage. The company is the largest wind power producer and the world's second-largest electricity utility by market capitalization, driving the electrification and decarbonization of the economy.
Largest independent renewable energy retailer in Spain since 2021
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Acciona Energía offers solutions for a decarbonized energy system, addressing the climate emergency and regenerating the planet with a positive impact. The company has pioneered renewable infrastructure development in Spain, including building the country's largest photovoltaic plant in 2001 and implementing the world's largest battery-free solar-powered irrigation system.
Highest rating in electricity utilities sector in Spain
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Redeia is fundamental to Spain's energy transition as the sole transmission agent and operator of the Spanish electricity system. Its infrastructure and management are key to the safe integration of a high percentage of renewable energy into the grid, supporting national decarbonisation and electrification targets.
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Enagás is fundamental to Spain's energy transition due to its natural gas infrastructure, which ensures a flexible and secure energy supply. Furthermore, the company actively promotes the development of green hydrogen and other renewable gases, positioning itself as a key player in the country's decarbonization and energy innovation.
Siemens Gamesa is a key player in Spain's energy transition, with a strong base in onshore wind business and a history of significant installations in the country. Its commitment to developing wind turbines and collaborating on renewable energy projects, such as the Iglesias wind project in Burgos, demonstrates its leadership in adopting clean energy.
This ranking has been developed to identify and recognize the most influential companies in Spain's energy transition, based on their leadership in renewable energy development and commitment to decarbonization.