Japan went nuclear-free on Monday as it switched off its last operating reactor for an inspection, with no date scheduled for a restart amid strong public hostility to atomic power.
Kansai Electric Power took offline the No. 4 reactor at its Oi nuclear plant in the western prefecture of Fukui at 1:33 am (1633 GMT Sunday) "without any problems," said a company official.
The move left the world's third largest economy without atomic energy for the second time since the Fukushima nuclear crisis erupted in March 2011.
Nuclear power supplied about one-third of the resource-poor nation's electricity before a tsunami knocked out cooling systems and sparked meltdowns at Fukushima, causing tens of thousands to flee their homes.
Prime Minister Shinzo Abe has openly backed a return to the widespread use of atomic energy, but the public remains divided over his support, with opponents concerned on safety grounds.
Japan previously was without any nuclear energy in May 2012, when all of the country's 50 commercial reactors stopped for checkups in the wake of the disaster.
Utilities were unable immediately to restart them due to public opposition.
It was the first time in more than four decades that Japan had been without nuclear power.
Government officials and utilities voiced concern at the time that Japan could face major blackouts without nuclear power, particularly in the western region that relied heavily on nuclear energy.
Their fears proved unfounded but the government last year gave Kansai Electric approval to restart No. 3 and No. 4 reactors at the Oi plant, arguing that nuclear energy was necessary to meet increased electricity demand during the winter.
The reactors were reactivated in July 2012 and resumed full commercial operation the following month, but the No. 3 reactor was shut down earlier this month for a scheduled inspection. The nation's other reactors have remained idle.
Utilities this summer have submitted applications to restart their reactors with the Nuclear Regulation Authority, which has significantly upgraded safety standards since the Fukushima crisis.
The central government and utilities will seek the consent of local governments and communities hosting nuclear plants before any future restarts.
Radiation was spread over homes and farmland in a large area of northern Japan when the massive tsunami hit the Fukushima nuclear power pant on March 11, 2011 and caused meltdowns of its reactors.
No one is officially recorded as having died as a direct result of the meltdowns, but tens of thousands were evacuated and many remain so. Some areas are expected to be uninhabitable for decades.
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In this combination photo, Tayo Kitamura, 40, kneels in the street to caress and talk to the wrapped body of her mother Kuniko Kitamura, 69, after Japanese firemen discovered the dead body in the ruins of her home in Onagawa, Japan, on March 19, 2011, top, and a newly built home sits at the site of the now-cleared but destroyed area on Wednesday, Feb. 22, 2012. (AP Photo/David Guttenfelder)
A few homes have been rebuilt in the year since an earthquake and tsunami roared across Japan's coastline, killing 19,000 people. But most communities remain unrecognizable, and their residents' futures uncertain. (AP Photo/David Guttenfelder)
The tsunami that slammed into Japan's coastline one year ago was merciless, sparing little in its path. Homes were reduced to rubble, cars tossed about like toys, and boats -- such as this one photographed in Kesennuma, Japan, on March 28, 2011 -- flung from the sea into streets and onto roofs. The ocean's fury, and the earthquake that preceded it, left around 19,000 people dead, hundreds of thousands homeless, and sparked the worst nuclear crisis the world had seen in a quarter century. (AP Photo/David Guttenfelder)
In this combination photo, Japanese vehicles pass through the ruins of the leveled city of Minamisanriku, Japan, on March 15, 2011, top, four days after the tsunami, and vehicles pass through the same area on Thursday, Feb. 23, 2012. (AP Photo/David Guttenfelder)
The earthquake and tsunami, which killed around 19,000 people, delivered one of their worst hits to the once-scenic, blue-collar fishing town of Minamisanriku, Japan, photographed here on March 15, 2011. The wall of water spared little in its path, sweeping away nearly every business and every job, and leaving more than half the town's residents dead or homeless. (AP Photo/David Guttenfelder)
A year after the earthquake and tsunami people across Japan and leveled this town, there are hints of progress _ the main roads are free of debris, and some temporary houses have been built. But many in Minamisanriku, and elsewhere across Japan's battered coastline, remain in a hellish state of limbo. (AP Photo/David Guttenfelder)
In this combination photo, a ship washed away by the tsunami sits in a destroyed residential neighborhood in Kesennuma, northeastern Japan, on March 28, 2011, top, and the same ship sits on the same spot on Thursday, Feb. 23, 2012. (AP Photo/David Guttenfelder)
A year after an earthquake and tsunami ravaged the country's coastline and killed around 19,000 people, many of the boats carried inland by the wall of water have been removed. But some, like this one, remain _ providing a stark reminder of nature's fearsome power. (AP Photo/David Guttenfelder File)
One year later, more than 3,200 people presumed killed in the earthquake and tsunami have yet to be found. They are among the 19,000 people who lost their lives on March 11, 2011. (AP Photo/David Guttenfelder)
In this combination photo, Japanese residents of Kesennuma, northeastern Japan, pass through a road that was cleared by bulldozer through the ruins of the city on March 17, 2011, six days after the tsunami, top, and people cross the same street on Thursday, Feb. 23, 2012. (AP Photo/David Guttenfelder)
In the days after the earthquake and tsunami ravaged Japan's coastal towns, the bulldozers began to arrive, clearing away the rubble that littered the roads, such as this street in Kesennuma, Japan, photographed on March 17, 2011. Those tasked with clearing away the wreckage faced a monstrous task: towering piles of twisted metal and wood, boats perched atop roofs, mountains of family heirlooms, sodden furniture and children's toys. They also faced the grim reality that many of the 19,000 people killed lay entombed in the rubble, waiting to be discovered. (AP Photo/David Guttenfelder)
One year after a powerful tsunami battered Japan and killed around 19,000 people, the streets have been cleared and the wreckage removed from town centers. But the process of destroying all that debris has been slow, with much of it still sitting in huge mountains in temporary holding areas. (AP Photo/David Guttenfelder)
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