Kansai Electric Power Co's Ohi nuclear power plant No. 3 (R) and No. 4 reactors are seen in Ohi, Fukui prefecture in this January 26, 2012 file photo. Japan's western Shiga prefecture, one of the nation's biggest sources of drinking water, threatened on Friday to oppose the restart of nearby nuclear reactors unless the government met several demands designed to prevent a repeat of the Fukushima disaster. Prime Minister Yoshihiko Noda's administration is keen to restart the two reactors at Kansai Electric's Ohi plant in Fukui to avoid power cuts. All but one of Japan's 54 reactors are offline after undergoing maintenance checks, and none has been restarted due to public safety worries after Fukushima. Picture taken January 26, 2012. To match Interview JAPAN-NUCLEAR/GOVERNOR REUTERS/Issei Kato/Files (JAPAN - Tags: ENERGY DISASTER POLITICS)