Electricity generation

Hydroelectric power and pumped storage

Hydroelectric technology is the foundation on which the company was built and has now become a key asset alongside pumped storage. This technology allows river flows to be regulated and energy to be stored on a large scale in a sustainable way, offering a fast and flexible response to demand fluctuations and supporting the development of other renewable energies. Facilities such as the Tâmega Gigabattery complex and the historic Aldeadávila hydroelectric plant have become strategic installations, capable of supplying more than one million homes.

At the end of 2025, Iberdrola had 13 GW of installed hydroelectric capacity, of which4.5 GW corresponded to pumped storage systems.

Offshore wind: large-scale projects and global expansion

Iberdrola is a global pioneer in offshore wind and has been driving this technology for more than a decade, consolidating it as one of its main growth drivers. At the end of 2025, we have 2.5 GW of installed offshore wind capacity and more than 3.5 GW under construction as part of our strategic plan, which will enable us to reach operational capacity close to 6 GW by 2028.

This growth is supported by key projects such as Saint-Brieuc, which supplies energy to more than 835,000 people in France; theEast Anglia Hub complex, made up of four wind farms that will exceed 3.9 GW of installed capacity by 2028; the German Baltic Sea hub, which will reach 1.2 GW with the commissioning of the Windanker project in 2026, in addition to the already operational Wikinger and Baltic Eagle; and Vineyard Wind I, the first operational offshore wind farm in the US.

Onshore wind: efficiency and consolidation of the generation fleet

With more than 21,000 MW of installed capacity worldwide, Iberdrola maintains its leadership in onshore wind energy and is now present in 11 countries. We continue to strengthen our commitment to this technology, allocating 24% of renewable investment under the Strategic Plan 2025-2028. The aim is to continue increasing installed capacity and repowering older wind farms located in areas with the best wind resources.

Photovoltaics: development and competitiveness of solar plants

One of the main advantages of solar photovoltaic energy is its rapid deployment and competitive cost, making it an ideal complement to the energy mix during daylight hours. These characteristics have enabled us to install 9 GW since 2017. Key projects include the Francisco Pizarro photovoltaic plant (Spain), the largest of its kind in Europe; True North (Texas), Avangrid’s largest solar project in the US; Fenix (Italy), the country’s largest solar plant; and Broadsound (Australia), Iberdrola’s largest solar project in that market.

Batteries and energy storage systems

The increasing integration of renewable sources into the electrical network is driving the need for longer-duration storage solutions capable of ensuring a constant and reliable supply even during prolonged periods of low renewable generation. For this reason, Iberdrola is also promoting efficient small-scale energy storage through lithium-ion batteries connected to renewable generation sites. Our Strategic Plan 2025-2028 includes €1.5 billion of investment to install 2 GW of new battery capacity, mainly in Spain and Australia. 

Nuclear energy: clean and stable power

Nuclear energy is a clean source that produces a large amount of electricity from a small amount of raw material, making it highly efficient. It operates continuously and does not depend on weather conditions, positioning it as a very stable source.

Nuclear energy strengthens countries’ energy sovereignty by reducing the need to import fossil fuels. It also contributes positively to reducing CO₂ emissions into the atmosphere.