The wind-hydro system includes a wind farm, a hydroelectric power plant, a pumping station and two water tanks.
The wind farm has five wind turbines and 11.5 MW of installed power (5 x 2.3 MW). To give you an idea, a household consumes 4,000 KWh a year. This means that Gorona del Viento can already supply electricity to 5,000 families .When the project will be completed, it will power the entire population of the island.
In addition to supplying households with electricity, the wind turbines supply energy to several pumping stations to retain water in a raised tank.
The water in this tank is a way of storing energy as it slides towards the lowest part of the island by the force of gravity, powering the hydroelectric plant.
The hydroelectric power plant has a power of 11.3 MW (4 x 2.83 MW) and the pumping station 6 MW (2 x 1.5 MW + 6 x 0.5 MW).
The lower tank can hold 150,000 m3 of water and the top tank, which is built in a natural volcanic basin, can store 380,000 m3.
In August 2015, thanks to the wind-hydro power station, the people of El Hierro were able to meet their goal: self-sufficiency in electricity without using fossil fuels. On August 9th, at noon, the Gorona del Viento power plant generated all the island's electricity using renewable energy for four consecutive hours. Over the following months, the island's 100% renewable generation period has been extended, becoming a world pioneer.