Kansai Electric Power Co., the operator of the Mihama nuclear power plant in western Japan, is mulling scrapping two aging reactors at the complex, as it may be too costly to upgrade equipment to meet new standards imposed following the Fukushima nuclear disaster, sources familiar with the matter said on Friday.

The Nos. 1 and 2 units at the Mihama complex, located on the Sea of Japan Coast in Fukui Prefecture, are both more than 40 years old. Kepco will seek to consult with the government as well as local authorities before making a final decision, the sources said.

All reactors in Japan have been shut down since the 2011 nuclear disaster began at the Fukushima No. 1 power plant, following the Great East Japan Earthquake and tsunami.