TEMPO.CO, Tokyo - A power plant operator said it will restart a reactor in southern Japan on Tuesday, the first restart under new safety requirements following the Fukushima disaster and a milestone for the nation's return to nuclear power.

Kyushu Electric Power Co. said Monday that it will restart the No. 1 reactor at its Sendai nuclear plant Tuesday morning.

The restart marks Japan's return to nuclear energy, breaking a four-and-half-year nuclear power impasse since the 2011 meltdowns at the Fukushima Dai-ichi nuclear power plant in northeastern Japan following the earthquake and tsunami.

The Nuclear Regulation Authority affirmed the safety of the reactor and another one at the Sendai plant in September under stricter safety rules imposed after the accident, the worst since the 1986 Chernobyl explosion. The plans call for the second reactor to be restarted in October.

The Sendai No. 1 reactor is scheduled to start generating power Friday and reach full capacity next month.

All of Japan's nearly 50 workable reactors have been offline for repairs or safety checks. Abe's government wants as many of them as possible to be put online to sustain the nation's economy, which now relies on imported energy.

Despite the push by the government and utilities for nuclear restarts, a majority of Japanese are opposed to a return to nuclear energy. Residents near the Sendai plant are also wary of the restarts, citing potential dangers from active volcanos in the region.

Opponents of the restarts and nuclear experts are also concerned that evacuation plans, in case of a disaster, may not work well.

Experts also are concerned about possible glitches in a mothballed reactor that has not been used for more than four years.

AP