Iberdrola officially opens the Tâmega Giga Battery, bolstering Europe’s energy storage economy
  • Official opening of €1.5bn Tâmega complex, with a storage capacity equivalent to the electricity consumed by 11 million people for 24 hours
  • Pumped storage technology has potential to play a key role in the energy transition


Iberdrola today officially opened one of Europe’s largest pumped storage hydroelectric facilities, the Tâmega Giga Battery in Portugal.

As Europe attempts to build an energy storage economy to aid the shift from fossil fuels to renewable energy and enhance energy security, the state-of-the-art Tâmega facility provides a template for how to do this.

With a capacity of 1,158 MW, Tâmega is capable of storing 40 million kWh, equivalent to the energy consumed by 11 million people during 24 hours in their homes.

Pumped storage hydro is the only proven technology that can store large amounts of electricity for long periods of time, and globally there is significant potential for new capacity to be developed.

Located in northern Portugal on the Tâmega river, the project consists of three power stations (Gouvães, Daivões and Alto Tâmega).

The project has supported thousands of jobs and has seen investment of €1.5bn. Tâmega will also displace 1.2 million tonnes of CO2 emissions each year and the socio-cultural and environmental action plan has seen investment of 50 million euros, benefitting 7 municipalities.

The Chairman and CEO of Iberdrola, Ignacio Galán, was joined by Portugal’s Prime Minister, António Costa, to officially open the flagship project.  Speaking at the event, Mr Galán also confirmed Iberdrola will double the investments made in the Giga Battery in the coming years in Portugal, reaching €3 billion, which will be allocated to new wind farms and solar plants already under development or in construction.

Chairman and CEO of Iberdrola, Ignacio Galan, commented:The opening of Tâmega reinforces the potential of this technology to solve Europe’s energy storage problem, as well as strengthening energy security. Tâmega will be central to Portugal’s energy transition, and we believe the project can kickstart a renewed focus on developing this technology across Europe. The transition to net zero requires a huge uplift in storage capacity. As it stands today, no other technology offers more than pumped storage hydro does.”.

Pumped hydro sites operate like a giant, efficient battery. In times of low demand on the electricity network, excess electricity from renewables can be used to pump water from a lower reservoir to a higher one. When demand is high for electricity, the complex can release this same stored water, producing high volumes of electricity quickly. The station can switch from pumping mode to generation mode quickly, and this flexibility helps to ensure the grid remains balanced.

Iberdrola is the global leader in energy storage, with 4.5GW of installed pumped storage capacity, excluding the Tâmega facility.


Please enter your comment!
Please enter your name here