Welsh News — April 17, 2018 at 8:01 am — Updated: April 17, 2018 at 8:01 am

Cynllun Castell Penrhyn i greu ynni o ddŵr gwastraff

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Castell Penrhyn ger Bangor yn arbrofi gyda thechnoleg newydd i greu ynni o ddŵr y sinc wrth iddo lifo i lawr y draen.

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