Can the ocean generate significant amounts of electricity?

The answer

Ocean energy can be harnessed through several methods: tidal barrages and tidal stream turbines capture energy from tidal flows, wave energy converters harvest the kinetic energy of surface waves, and ocean thermal energy conversion (OTEC) exploits the temperature difference between warm surface water and cold deep water. The theoretical global potential of ocean energy exceeds 100,000 terawatt-hours per year, far more than current global electricity consumption. The world's largest tidal power station, La Rance in France, has operated since 1966 producing 540 gigawatt-hours annually. However, challenges including high installation costs, saltwater corrosion, and environmental impacts on marine life have slowed widespread adoption.