[2] On 16 December 2011 Kansai Electric Power Company halted the No.2 reactor for a 4-month safety check following the Fukushima nuclear accident.

The governor of Shiga Yukiko Kada, who was visited later for a likewise explanation, reacted in a similar way: she asked for no hasty decisions.

On 9 April 2012 of this only 54 were already implemented: the earthquake resistance of the power transmission towers was improved, satellite telephone communication was installed, seawater could be taken in to cool the systems.

Venting systems to release steam from the containment with filters to remove radioactive isotopes were planned to be built in 2015.

To prevent the rise of electricity charges and an estimated power shortage of 18% in the summer of 2012 the two reactors needed to be restarted.

The assembly made the decision in consideration of the economic damage that a prolonged suspension could cause and conveyed its view to Oi Mayor Shinobu Tokioka later in the day.

The mayor was set to make a decision on whether to approve the restarts after reflecting on the assembly's conclusion and the results of the appraisal made by Fukui's nuclear safety commission and other matters.

[12][13][14][15] In September 2012 the city and prefecture of Osaka requested that both units 3 and 4 be shut down, stating that the power was not needed.

[16] On 29 October 2012 Kansai Electric Power Co. announced in an interim report that the F-6 fault running north–south between the plant's Nos.

[18] In the first weeks of June 2013 a team of inspectors, including NRA Commissioner Toyoshi Fuketa, examined the two operating reactors.

To resume operations, the reactors needed to comply with the new requirements, including the absence of active faults under the plant.

[23] In December 2017 Kansai Electric Power announced that it will decommission Ōi-1 and Ōi-2 because of their age and the difficulty of making safety upgrades within their small containment vessels.