English: EEC
Welsh: YEY
Subject: Amgylchedd
English definition: Energy Efficiency Commitment. A programme encouraging domestic gas and electricity customers to improve energy efficiency.
Welsh definition: Ymrwymiad Effeithlonrwydd Ynni. Rhaglen sy'n annog defnyddwyr nwy a thrydan domestig i ddefnyddio ynni'n fwy effeithlon.