Read MoreSoaring over the clear waters of Loch Awe in Scotland is a mountain, Ben Cruahan, that masks a marvel of engineering: a hydroelectric plant carved deep within that points to the future of renewable energy, capable of powering 800,000 homes in seconds. Correspondent Roxana Saberi reports.Soaring over the clear waters of Loch Awe in Scotland is a mountain, Ben Cruahan, that masks a marvel of engineering: a hydroelectric plant carved deep within that points to the future of renewable energy, capable of powering 800,000 homes in seconds. Correspondent Roxana Saberi reports.
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