Welsh sheep farmer Howell Williams cleaning the intake at the entry point to the farms 15kW hydro power plant on the Brecon Beacons, Wales.

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