The Osaka-based firm said the expected loss in April to September period would be mainly due to extra costs of fossil fuel as it increased thermal power generation in times of its nuclear plants remain inactive.

All the nuclear reactors in Japan, including Kansai operated units, were shut down in the aftermath of the Fukushima meltdowns triggered by massive tsunami and earthquake last year.

However, Kansai restarted two reactors at its Oi power plant in July after a go-ahead signal to restart them from Prime Minister Yoshihiko Noda, reported Japan Today.

The utility had operated 165 electric power supply facilities, and 14,085km overhead and 4,384km underground transmission lines, as of 31 March 2011.