Indian Point’s Unit 2 reactor resumed generating power Monday, following a shutdown of more than two weeks caused by a malfunction in a generator.

Unit 2 — one of the Buchanan power plant’s two working nuclear reactors — was returned to service around noon Monday, according to Jerry Nappi, a spokesman for Indian Point’s owner, Entergy.

The unplanned shutdown occurred while the plant’s other working reactor, Unit 3, was already down for its biennial refueling and maintenance. It was the first time in 10 years both reactors were down at the same time.

Unit 2 automatically shut down around 3 p.m. on March 15 when there was a malfunction in a generator on the non-nuclear side of the plant. Power was temporarily restored for nearly 13 hours on March 24 before the reactor shut down again.

The Nuclear Regulatory Commission’s on-site inspectors have been monitoring Indian Point’s efforts to restore power to the reactor and said public safety was never in jeopardy.

 “Our Resident Inspectors assigned to Indian Point were aware that Indian Point Unit 2 was restarting and have been following power-ascension activities,” NRC spokesman Neil Sheehan said. “They will continue to do so.”

Unit 2 is scheduled to shut down for good in 2021. Unit 3 will shut down next year.