As many as 20 homes in the Marlborough Sounds are without power for a third day on Thursday.
Marlborough Lines says heavy rain and winds this week brought down power lines throughout the region.
The company says about 7000 customers lost power on Tuesday morning. Operations manager Brian Tapp says there are still a few remote areas where power has not yet been restored.
Mr Tapp says tourists and bach owners arriving for New Year celebrations could find more properties without power.
Meanwhile, State Highway 6 between Renwick and Nelson has reopened, but Civil Defence warns drivers still need to be cautious on the roads.
They are also warning beach visitors to avoid swimming or collecting shellfish if waters are discoloured.