He said that if it was possible to harness the power of waves hitting the entire length of the Western Isles' Atlantic coastline on Monday, they would equate to 120 nuclear power stations on maximum electricity generation output.

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Worldwide, nuclear energy has made great strides in electricity generation, accounting for 16% of global output, up from 3% three decades ago.

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After 40 years, a generation, total U.S. economic output would nearly quadruple.

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In generation, lower procurement costs and improved efficiency levels compensated for 20% lower output, due in part to plant outages.

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With electricity generation up 14% this year in China and 8% in India, and global steel output expanding by 8%, demand for thermal and metallurgical coal has been steadily growing.

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