Mae’r sgôr effeithlonrwydd ynni cyfartalog ar gyfer cartrefi newydd wedi gwella ers 2009, a gwelwyd gostyngiad o 1.2 miliwn o dunelli (15%) ers 2008 mewn allyriadau carbon deuocsid sy’n gysylltiedig â’r sector domestig.
The average energy efficiency rating for new homes has increased since 2009, while carbon dioxide emissions associated with the domestic sector have fallen by 1.2 million tonnes (15%) since 2008.