After the Tōhoku earthquake (magnitude 9.1) in March 2011, the plant ran on emergency power provided by backup diesel generators. The emergency generators were not intended for long-term use. Reportedly there are about 3,000 tons of highly radioactive used nuclear fuel stored in Rokkasho at the current time. Japanese radio reported on 13 March that 600 liters of water leaked at the Rokkasho spent fuel pool. According to "The New York Times", grid power was restored on 14 March 2011.