Kansai Electric Power Co. said Tuesday it has found an additional 14 cases of falsified inspection data on its thermal power plants, bringing the total of such cases to 101.
The 14 cases are particularly serious, such as concocting numerical values to make them meet criteria, and changing criterion measures, Kepco said.
It said it has also found about 8,000 cases of simple mistakes in inspection data, such as transcription and clerical errors.
The government has been conducting inspections of facilities operated by Kepco, the nation's second-largest power company, following revelations in May that it falsified inspection records.
The Ministry of Economy, Trade and Industry has said it will conduct more inspections of facilities and consider administrative punishments after receiving additional reports from Kepco.
"It's a grave matter, and I want the company never to engage in such things again," METI chief Shoichi Nakagawa told a news conference earlier in the day.
Nakagawa said he intends to monitor how Kepco acts on the matter "as a company whose business is highly related to the public interest."