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Verb
Gwaith adnewyddu ar adeilad sy'n sicrhau arbedion ynni o 60% neu ragor, o'i gymharu รข'r defnydd ynni cyn y gwaith.
Diffiniad y Comisiwn Ewropeaidd yw'r un a nodwyd, ond nid yw pawb yn rhannu'r diffiniad hwn.