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Cornwall can already produce more than 80 megawatts (MW) of electricity from wind, hydro-electric, solar and other renewable energy sources.
BBC: Roscrow wind farm tests strain of green energy on power grid
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Rains have replenished Brazil's hydro-electric dams, allowing the government to stop rationing energy.
ECONOMIST: Politics in Brazil
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Environmental groups like Greenpeace and Friends of the Earth would like to see a switch to renewable and clean sources of energy such as solar, wind and hydro-electric power.
BBC: Impact of global warming may be severe and wide-ranging
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Scottish Hydro-Electric Transmission Limited (SHETL), a subsidiary of Scottish and Southern Energy (SSE), put plans for the interconnector on hold last year.
BBC: Western Isles sub-sea cable 'could affect' mud life
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Scottish and Southern Energy Renewables has applied to build Scotland's biggest ever hydro electric scheme at the west end of the Great Glen.
BBC: The Great Glen, picture taken by Fiona Carr
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Energy firm SSE, which trades as Scottish Hydro, Swalec and Southern Electric, will increase its domestic gas and electricity prices by an average of 9% from 15 October.
BBC: SSE to raise gas and electricity prices
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"Hydro electric schemes, which use impounded water to generate electricity, are an excellent means of energy storage, " said SSE Renewables managing director Jim Smith.
BBC: The Great Glen, picture taken by Fiona Carr