A former slate quarry in Llanberis could be used as a site for a 100 million pound hydro-electric power scheme under plans submitted to Gywnedd Council.
The quarry at Glynrhonwy in Llanberis was closed 80 years ago-and its hope the venture could bring badly needed job to the area.
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Barry Rogers is on trial along with his mother for the murder of his 84-year-old grandmother Betty Guy in 2011.