Nuclear reactor buildings of the Kyushu Electric Power Sendai nuclear power plant are seen behind police officers standing guard in the twilight in Satsumasendai in Kagoshima prefecture, on Japan's southern island of Kyushu on August 11, 2015.

Story highlights

Second reactor restarts after the mothballing of the country's nuclear energy program in 2012

Many citizens oppose the restarts, and nuclear power production after Fukushima disaster

CNN  — 

Japan has restarted its second nuclear reactor since the Fukushima disaster in 2011 shut down the country’s nuclear energy program.

The Kyushu Electric Power Company told CNN that it restarted the Dai-ni reactor at Sendai Nuclear Power Plant Thursday morning as planned and the reactor is scheduled to be fully operational and producing power by October 21.

The move comes despite widespread opposition to the use of nuclear energy in Japan.

About 100 protestors opposing the restart gathered outside of the Sendai nuclear power plant, chanting slogans.

“We restart the reactors, respecting the decisions approved by the Nuclear Regulation Authority as meeting the world’s most stringent and newest regulations,” Chief Cabinet Secretary Yoshihide Suga said at a regularly-scheduled press conference.

The plant, in the country’s southern Kagoshima prefecture, on the southern island of Kyushu, also hosts the only other reactor to have been restarted since the disaster, which saw much of Fukushima prefecture, north of the capital, Tokyo, evacuated in 2011.

The company restarted the Dai-ichi – number one – reactor at the same Sendai power plant on August 12, 2015.

Widespread opposition

People stage a sit-in rally outside the gates of the Kyushu Electric Power Sendai nuclear power plant on August 11, 2015, as the first reactor was brought back online.

The Fukushima disaster, which occurred when a tsunami caused by a massive earthquake off the coast of Japan, flooded the plant’s reactors, causing a meltdown at three of them.

It led to the mothballing of Japan’s nuclear energy production by May 2012.

The decision to restart the country’s nuclear energy production in the wake of the disaster has been met with widespread opposition, despite what Prime Minister Shinzo Abe calls the “world’s toughest” nuclear power safety measures.

Abe’s government, also under fire for other unpopular decisions including the redrafting of the country’s constitution to allow military intervention overseas, hopes to use nuclear power to provide 20 to 22% of Japan’s total electricity needs, Japanese media reports.

READ: Court halts restart of two nuclear reactors due to safety concerns

CNN’s Junko Ogura and Yoko Wakatsuki in Tokyo contributed to this report.