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The ocean has great potential as a renewable energy source, but the industry struggles with technical challenges, harsh environments, and environmental permitting.
Finnish start-up WaveRoller says it's found a way to capture the kinetic energy beneath the sea's surface--without buoys or other floating devices.
Ireland is in the right place to generate electricity, and a lot of it, out of oceanic surges, but it won't be easy sailing. Video: Ocean-based renewable energy
Orecon wants to take oil rigs and churn wave power with them. It won't be easy but more eyes are looking at wave power these days.