Loss of whereabouts of an external storage medium containing customer information at Kyushu Electric Power Transmission and Distribution Co., Inc.
Kyushu Electric Power Transmission and Distribution Co., Inc. (a consolidated subsidiary of the reporting company)
Certain systems of Kyushu Electric Power Transmission and Distribution Co., Inc., a cabinet in the company's server room, and an external storage medium
Related procedures
Reports to the Personal Information Protection Commission and the relevant supervisory authorities
The Personal Information Protection Commission and the relevant supervisory authorities (names Not disclosed)
Company response
The company is interviewing relevant persons who entered or left the premises between 27 April and 26 May and conducting on-site investigations, among other measures. The investigation includes the possibility that the medium was removed without authorization. The establishment of a third-party committee or similar body is Not disclosed.
The company will consider and implement measures to prevent a recurrence in the management of external storage media.
If it becomes clear that the matter will have a material impact on financial results, the company will promptly disclose it.
The company will continue searching for the external storage medium and will notify the affected customers individually. It will also consider and implement measures to prevent a recurrence in the management of external storage media.
If it becomes clear that the matter will have a material impact on financial results, including if a leak of customer information is confirmed, the company will promptly disclose it.
| Item | Details |
|---|---|
| Event name | Loss of whereabouts of an external storage medium containing customer information at Kyushu Electric Power Transmission and Distribution Co., Inc. |
| Date of occurrence | Between 27 April 2026 and 26 May 2026 (the specific date on which the medium went missing is Not disclosed) |
| Date recognized / date notice received | 26 May 2026 (the medium was found to be missing while preparations were being made for a scheduled backup) |
| Subject Entity | Kyushu Electric Power Transmission and Distribution Co., Inc. (a consolidated subsidiary of the reporting company) |
| Target Locations / Products | Certain systems of Kyushu Electric Power Transmission and Distribution Co., Inc., a cabinet in the company's server room, and an external storage medium |
| Impact on Earnings Forecast | If it becomes clear that the matter will have a material impact on financial results, the company will promptly disclose it. |
| Type of litigation or proceeding | Reports to the Personal Information Protection Commission and the relevant supervisory authorities |
| Court or authority | The Personal Information Protection Commission and the relevant supervisory authorities (names Not disclosed) |
| Investigation structure | The company is interviewing relevant persons who entered or left the premises between 27 April and 26 May and conducting on-site investigations, among other measures. The investigation includes the possibility that the medium was removed without authorization. The establishment of a third-party committee or similar body is Not disclosed. |
| Measures to prevent recurrence | The company will consider and implement measures to prevent a recurrence in the management of external storage media. |
| Outlook | The company will continue searching for the external storage medium and will notify the affected customers individually. It will also consider and implement measures to prevent a recurrence in the management of external storage media. |
| Planned follow-up disclosure | If it becomes clear that the matter will have a material impact on financial results, including if a leak of customer information is confirmed, the company will promptly disclose it. |
Items this document does not state (13)
These are items the company does not state in this document. We do not leave them blank, nor fill them in from other sources or by inference.
The reasons the company gives
The company's own explanation, not something inferred from the numbers.The direct cause of the medium going missing has not been disclosed. The capacity constraints of the backup system are cited as the background to the use of the external storage medium.