Kyushu Electric Power Co said it has restarted the No 1 reactor at its Sendai nuclear plant as planned.
The restart marks Japan's return to nuclear energy four-and-half-years after the 2011 meltdowns at the Fukushima Dai-ichi nuclear power plant in northeastern Japan following an earthquake and tsunami.
The national broadcaster NHK showed plant workers in the control room as they turned the reactor back on.
Tomomitsu Sakata, a spokesman for Kyushu Electric Power, said the reactor was put back online without any problems.
A majority of Japanese oppose the return to nuclear energy. Dozens of protesters, including ex-Prime Minister Naoto Kan, who was in office at the time of the disaster and has become an outspoken critic of nuclear power, were gathered outside the plant as police stood guard.
The Nuclear Regulation Authority affirmed the safety of the Sendai reactor and another one at the plant last September under stricter safety rules imposed after the 2011 accident, the worst since the 1986 Chernobyl explosion.
Koichi Miyazawa, Japan's industry minister, said today that the government would "put safety first" in resuming use of nuclear power.
All of Japan's 43 workable reactors were idled for the past two years pending safety checks. To offset the shortfall in power output, the country ramped up imports of oil and gas and fired up more thermal power plants, slowing progress toward reducing its emissions of greenhouse gases.
Prime Minister Shinzo Abe has sought to have the reactors restarted as soon as possible to help reduce costly reliance on imported oil and gas and alleviate the financial burden on utilities of maintaining the idled plants.
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