Kansai Electric Power Co. is set to file a damages suit against one-time members of its management over a bribery scandal involving a former deputy mayor of a town that hosts one of its nuclear plants, sources familiar with the matter said Friday.

The Osaka-based utility decided to file the lawsuit after its investigation commission consisting of outside lawyers concluded that five former executives, including former Chairman Makoto Yagi, inflicted some ¥1.3 billion in damages on the company, the sources said.

Kansai Electric, which plans to finalize the decision at an extraordinary meeting of its board of auditors on Monday, is expected to sue all five, including former President Shigeki Iwane, the sources said.