Derbyniodd y trigolion a symudodd i mewn ym mis Ionawr eleni eu bil ynni negyddol cyntaf ym mis Mawrth, sy'n golygu bod yr ynni dros ben y mae eu cartrefi wedi'i gynhyrchu eisoes wedi'i bwmpio'n ôl i'r grid cenedlaethol.
The residents who moved in in January this year, received their first negative energy bill in March, meaning the excess energy their homes have generated has already been pumped back into the national grid.