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On many days of the year, northern Scotland will be running on entirely renewable electricity. Powered by some of Europe’s strongest winds and tides, the region could produce even more clean energy - but much of it has nowhere to go. CNN travels to the Orkney Islands to see how this remote archipelago is not just leading the way in generating clean electricity, but has become a living lab for one of the biggest challenges of the energy transition: what to do with too much power.