Voters had to cast their ballot by candle light and by the light of their mobile phones in some polling stations in south Co Dublin on Saturday because of a power outage.
Parts of Monkstown, Foxrock, Leopardstown and Blackrock were hit by the outage which lasted for one hour and 13 minutes according to the ESB.
Some 2,000 customers were affected by a cable fault that occurred in Monkstown at about 7.30pm.
The ESB said repair crews were immediately dispatched to the fault and power was returned to everyone by 8.47pm, just over an hour before polls closed at 10pm.
“Some voters experienced minor inconvenience but power was restored quickly,” the ESB said.
Voter turnout in the Dún Laoghaire constituency where the outage took place was 41.54 per cent. The constituency polled the third strongest Yes vote after the constituencies of Dublin and Dublin South East with 71.75 per cent of people voting Yes.