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Tidal/Wave Energy Caused by the pull of the moon on ocean surface ? renewable Places with strong currents like Australia are hot spots for these 3 main ways to harvest tidal energy: 1) Tidal Barrages, offshore turbines, water power devices Tidal Barges ? a huge dam is built across a flowing body of water. Tide turns a turbine to gather energy. Offshore turbines ? Like underwater windmills. Current spins and they are anchored to the bottom. More environmentally friendly Water Power devices. Point absorbers: floating structrures with anchored bases embedded in the ocean