A similar increase was found in surviving partners from marriages and civil partnerships, with 9% of those saving energy within the group having this as their main reason.
Gwelwyd cynnydd tebyg mewn partneriaid sydd wedi goroesi o briodasau a phartneriaethau sifil, gyda 9% o'r rhai sy'n arbed ynni o fewn y grŵp yn dweud mai dyma'r prif reswm dros hynny.