A court in Japan has ordered Kansai Electric Power to shut down two of its reactors in Takahama, western Japan.
The Otsu District Court ruling came after complaints by local residents about the safety of the plant.
It comes ahead of the fifth anniversary of the earthquake and tsunami that led to the Fukushima nuclear disaster.
Local media say the plant has been told to shut immediately and that this is the first ruling issued in Japan against an operating nuclear plant.
The company says it will quickly appeal against the ruling.
Of the two reactors to shut down, the No 3 reactor is currently running, which the No 4 reactor was taken offline last month after a technical problem just days after it restarted.