Welsh sheep farmer Howell Williams and Chris Blake of The Green Valleys stand on the banks of the stream at the base of the farm 15kW hydro power plant on the Brecon Beacons, Wales.

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Photo credit: © Adam Murphy / Alamy / Afripics
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Keywords: aitchison, ashden, beacons, brecon, electricity, energy, engineer, environmental, farm, farmer, green, hydro, power, sheep, sustainable, technology, wales, water