Welsh News — August 9, 2017 at 7:03 am — Updated: August 9, 2017 at 7:03 am

Cynllun ynni allai ostwng biliau 60%

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Mae gan gynllun arbennig sy’n troi cartrefi yn orsafoedd pŵer y potensial i gwtogi biliau tanwydd fwy na 60%.

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