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There's power in them thar waves! That's why Portugal built Agucadoura, the world's first wave farm off its coast, consisting of three Wave Energy Converters generating a total of 2.25MW.

The elongated metal contraptions bob up and down with the waves, while internal pistons, attached to the sea floor, remain stationary and pump hydraulic fluid. This drives electric generators, whose power is brought ashore by underwater electrical cables. The wave farm is now tapping into enough constant, renewable energy to power 1500 homes.