Mewn faint o gartrefi y gwnaed gwaith o dan y cynllun rhwymedigaeth cwmnïau ynni (ECO4) yn ystod y 12 mis diwethaf?
Wedi'i ateb gan Ysgrifennydd y Cabinet dros Lywodraeth Leol a Thai
| Wedi'i ateb ar 19/11/2024
The Energy Company Obligation (ECO) scheme is a UK Government energy efficiency scheme designed to tackle fuel poverty and help reduce carbon emissions. Welsh Government does not have a role in its administration.