Spanish utility Iberdrola is planning the largest pumped storage plant in Europe.
The Conso II project, earmarked for Ourense, Galicia, will cost more than €1.5bn, website Enerdata reports.
The plant would use excess energy from solar plants to pump water from a lower reservoir to a higher one. When additional power is needed, the water flows back down through turbines.
Conso II will have a capacity of 1.8GW, or enough to supply 10 million people for a day.
Construction, scheduled to begin in 2025, is expected to create about 3,000 jobs over six-years.
Conso II will be mostly located underground to minimise its impact on the landscape. It will also use the existing Bao and Cenza reservoirs.
The project is expected to strengthen Spain’s energy security and its technological level within the European energy sector.
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