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Lake Sihwa in South Korea is home to the world\\u2019s largest operating tidal power station, using the tides to generate enough power for a city of half a million people. This regular rise and fall of the seas is more predictable than sunny or windy weather and can be forecast years in advance.\\n \\nNine thousand miles away in Northern Ireland is Strangford Lough. A narrow inlet leading to the mighty Atlantic Ocean means it\\u2019s one of the world\\u2019s best sites for harnessing tidal energy. The fast and strong currents have led to the world\\u2019s first commercial-scale tidal energy power station being built here. But now that\\u2019s being decommissioned.

The technology for harnessing tidal energy has been around for more than half a century and the potential to create energy from the sea is huge. Yet tidal power only accounts for a tiny proportion of the global renewable energy mix. Presenter Graihagh Jackson finds out what\\u2019s holding tidal power back.\\n \\nThanks to our contributors: \\nR\\xe9mi Gruet, CEO of Ocean Energy Europe \\nDr Carwyn Frost, Lecturer at Queen\\u2019s University Belfast \\nChoi Jae-baek, Senior Manager of K-water \\nEmail: theclimatequestion@bbc.com \\nPresenter: Graihagh Jackson \\nReporters: BBC\\u2019s Jordan Dunbar in Norther Ireland and freelance journalist Malene Jensen in South Korea \\nProducer: Ben Cooper \\nResearcher: Octavia Woodward and Shorouk Elkobrosi \\nEditor: Alex Lewis \\nSound Engineer: Tom Brignell