In March 2011, a 9.0-magnitude offshore earthquake triggered a 46-foot tsunami that hit Japan's Fukushima NPP, leading to the leakage of radioactive material into the surrounding environment and the shutdown of the plant. The accident is considered to be the world's worst nuclear disaster since Chernobyl.
Before the disaster, NPPs supplied almost 30 percent of the electricity consumed in Japan. After the accident, all NPPs in Japan were either closed down or their operations suspended.
The Takahama NPP was shut down soon after the Fukushima NPP disaster. Three of its nuclear reactors were restarted in January.