Power will be restored a little earlier than expected to about 35,000 customers still without electricity in Moore County.
The outage spread across most of the county Saturday night after someone shot up two electrical substations.
Duke Energy spokesman Jeff Brooks says crews were working 24 hours a day and should have power restored Wednesday night.
"Now that won’t happen all at once. That will happen in phases," he said. "This is a very complicated process that involves equipment that has been moved in place and installed. It’s there. But now we’re going through the process of calibrating it and testing it and preparing it to synchronize with the electric grid which is a very complex process."
Brooks had been saying it could take as long as Thursday.
In the same news conference, authorities said the investigation into the attacks was moving quickly but offered no new details.
Moore County schools will remain closed Wednesday and Thursday, and a night-time curfew will stay in effect.