he Pentland Firth is a raw, stormy sound between the Scottish mainland and the Orkney Islands, known for some of the world’s fastest flowing marine waters. Daily tides here reach 11 miles per hour, and can go as high as 18 – a breakneck current that’s the reason people are describing Scotland as the Saudi Arabia of tidal power.
http://nextcity.org/daily/entry/tidal-turbines-could-power-one-third-of-scotland-future-resilience
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