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Definition: rhoi deddfwriaeth yr Undeb Ewropeaidd ar waith mewn deddfwriaeth ddomestig
Context: Mae rheoliadau 11 i 19 a rheoliadau 21 i 22 yn trosi Erthyglau 2, 3, 6, 7, 9 ac 11 o Gyfarwyddeb Senedd Ewrop a’r Cyngor 2010/31/EU sy’n ddyddiedig 19 Mai 2010 ar berfformiad ynni adeiladau (ail-lunio) (“y Gyfarwyddeb ail-lunio”).
