April 17, 2012. Japan may be without atomic- generated electricity for the first time in more than four decades next month when its last reactor still running after the Fukushima nuclear disaster shuts for maintenance. Since the crisis on March 11 last year, 53 of Japan's 54 reactors have been shut either owing to damage from the earthquake and tsunami, government order, or mandatory maintenance. The plants provided 30 percent of the country's electricity prior to March 11. The last one running on the northern island of Hokkaido goes offline from May 5.