Kyushu Electric Power Company, Incorporated
Report on the whereabouts unknown case of external storage media storing customer information at Kyushu Electric Power Transmission and Distribution (Second Update)
Due to the whereabouts unknown status of external storage media at Kyushu Electric Power Transmission and Distribution, a report was submitted to the Ministry of Economy, Trade and Industry. Target data exceed 80 million records (personal information about 3.51 million records, corporate etc. about 12.16 million records, estimated). Individual notifications to affected customers are planned from early August. As of now, no data leakage has been confirmed; as a prevention measure, the use of external storage media will be halted in principle, and policy on key management, encryption, and education will be strengthened.
Key Figures
- Target period data total: 13,540,000 records (7,140,000 corporate etc., 10,030,000 individuals)
- Personal information records: 3,510,000 records
- Corporate etc. information records: 12,160,000 records
AI要約
Background and overview of the incident
Our subsidiary Kyushu Electric Power Transmission and Distribution considered and implemented a process to back up past data to SSDs to address server capacity constraints for data storage. However, in May 2026, the SSDs were found to be missing, and a police report was filed. No data leakage has been confirmed to date. We were requested to report to the Ministry of Economy, Trade and Industry, and on June 8 we decided on preventive measures such as strengthening internal investigations and lock-and-key management.
Prevention measures and future actions
Prevention measures will rigorously implement the three principles of external storage media use: do not use, do not remove, and cannot read. This includes revising internal regulations, strengthening instructions to contractors, continuing information security education, and enhancing audit and verification processes. External storage media will not be used in principle, and if use is unavoidable, access will require authorization from an appropriate authority.
Kyushu Electric Power Transmission and Distribution Company, Limited
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