They collectively formed a partnership body to consider the issues and opened up without commitment discussions with the UK Department of Energy and Climate Change (DECC).
Ffurfiwyd corff partneriaeth rhwng y cynghorau i ystyried y manylion a dechreuwyd, heb unrhyw ymrwymiad, drafodaethau gydag Adran Ynni a Newid Hinsawdd y Deyrnas Unedig.