Duke Energy Progress has restarted the Harris nuclear plant in Wake County.
The plant will gradually be brought back up to full power, spokeswoman Kim Crawford said, a process that takes one day to complete.
Earlier this week the Nuclear Regulatory Commission gave approval for the Harris plant to resume generating electricity after a year-old problem came to light and caused an unplanned shutdown last month.
The federal agency also plants to hold a public meeting in Holly Springs next week to discuss the incident that caused the May 15 shutdown of the plant, which is less than 25 miles from downtown Raleigh.
The NRC classified the problem as a degraded condition but has continually emphasized the situation never caused a threat to public safety.
The Harris plant is operated by Raleigh-based Duke Energy Progress, a subsidiary of Charlotte-based Duke Energy. Duke acquired Progress last year.
Progress declined to disclose its timetable for restarting the plant earlier this week, citing competitive business reasons.
Next week's public meeting is scheduled for 6 p.m. on Thursday at the Holly Springs Cultural Center, 300 W. Ballentine St.