About 1,100 customers were still without power at 16:15 GMT, with Northern Ireland Electricity (NIE) saying up to 6,500 were without power at its peak.
Three fire appliances were deployed to Park Avenue in Dundonald, but some residents were stuck as water flooded the downstairs of their properties.
Resident Sarah Kirkwood left her home after she woke up at about 07:00 GMT on Saturday and saw the water rising in the street.
She then rang the Department for Infrastructure’s (DfI) flood incident helpline to ask for sandbags.
“I made them aware of the situation in the street, the water was coming up the manholes,” she told BBC News NI.
Ms Kirkwood explained that the area was prone to flooding, but the water had never entered her home before.
“It comes about halfway up the street every year and they’ve been doing works… so we thought it was all in hand,” she added.
After leaving to get sandbags, Ms Kirkwood arrived back to find her property had flooded, which left her frustrated.
Despite the turn of events, Ms Kirkwood said she is “fortunate” to have family she can stay with while the damage in her home is dealt with.
It is understood that emergency accommodation has been provided for those unable to return to their homes.
