Yesterday, July 18, the Mutriku Wave Energy Plant in Gipuzkoa, the world’s first breakwater wave power plant with a multiple turbine arrangement, run by the Basque Country Energy Agency, celebrated its fifth anniversary. The relatively scarce development of oceanic wave energy makes the Mutriku site a pioneer project at the global level.
The Mutriku Wave Energy Plant has just produced its first gigawatt of electricity from the breakwaters of the Mutriku harbor, enough to supply a hundred homes. But the plant is also also an experimental site, used to test out turbines and auxiliary equipment.
As regards the technical specifications, the plant itself is a hollow, trapezoidal structure with a submerged front opening and an opening at the top. The front opening is 3.20m high and four meters wide. Each of the 16 air chambers in the hollow structure houses a turbine weighing 1,200kg. The turbines are 2.83m high and four meters wide, and work with air. They do not, however, contain a gearbox, hydraulics, or pitching blades.The 16 turbines are connected to an 18.5kW turbo generator. A butterfly valve at the bottom of the generator enables isolation of the generator from the turbines whenever required. Any salts or impurities blocking the blades are removed by injecting fresh water. The plant is also installed with control and power conditioning equipment. The voltage of the current is stepped up using a transformer near the plant. Generated power is transferred through a transmission line.
For further and more detailed information on the project, see “Mutriku Wave Power Plant: From The Thinking Out to The Reality.”
If you’re interested in this topic, check out the Center publication Sustainable Development, Ecological Complexity, and Environmental Values, edited by Ignacio Ayestarán and Miren Onaindia. This is a fascinating study of how global issues such as sustainability are addressed at the local scale, in this case in the Basque Country.