Tokyo Electric Power Co. has only covered 2 percent of the ¥76.1 billion that municipalities have spent on decontamination work since the Fukushima nuclear crisis began in 2011, according to Environment Ministry officials.

Tepco, operator of the Fukushima No. 1 power plant, has effectively refused to cover the costs of removing tainted soil and other debris gathered by the fallout-hit governments, saying it is confirming whether such payments are required by law.

The central government has paid for the cleanup work on Tepco's behalf, but if the utility continues to balk, more taxpayer money will be needed to cover the interest payments.