Pandora's Box is a homemade invention to make electricty from ocean waves.

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The Pelamis Wave Energy Converter

Max Carcas from Ocean Power Delivery is speaker
The World Energy Council has estimated the 'useful' global ocean wave energy resource as 2TW (17,500TWh/year). From this it has been estimated (Thorpe 1999) that the practical economic contribution from wave energy converters could be 2,000TWh/year (similar to current installed nuclear or hydroelectric generation capacity). Such generating capacity could result in up to 2 billion tonnes of CO2 emissions being displaced from fossil fuel generation per year - similar to current emissions from electricity generation in the US.

For more information:
The Pelamis Wave Energy Converter

A European Commission video that introduces the Wave Dragon wave energy converter

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The Wave Dragon