The Carbon Trust, Energy Saving Trust and Dŵr Cymru have all provided support during the challenge, which forms part of our national PR campaign.
Mae’r Ymddiriedolaeth Garbon, yr Ymddiriedolaeth Arbed Ynni a Dŵr Cymru i gyd wedi helpu’r her, sy’n rhan o’n hymgyrch cysylltiadau cyhoeddus genedlaethol.