People search Kyushu Electric Power data breach timeline because the brand sits on billions of accounts, credentials, and cloud workloads. BreachHistory indexes 2 Kyushu Electric Power-linked incidents (1 company-confirmed), with headline counts up to 10.9M+ in catalog rows. This page maps every attested event through 2026 with internal links to canonical records.
Why Kyushu Electric Power breach history matters
Kyushu Electric Power operates in Energy. Across indexed rows, recurring themes include ransomware and extortion, cloud and database misconfiguration. Understanding the chronological pattern helps security teams, customers, and regulators separate confirmed disclosures from forum marketing.
Full timeline through 2026
2026 — lost unencrypted backup SSD; up to 10.9M customer accounts
Verified breach. Kyushu Electric Power Transmission and Distribution Co., a Kyushu Electric Power subsidiary, announced on June 8, 2026 that an external solid-state backup drive containing customer information could not be located. The device was written on April 27, 2026 during routine server backup work, stored in a server-room cabinet, and discovered missing on May 26 when staff returned for another task. Kyushu Electric stated the incident may affect up to 10.9 million customer accounts in the Kyushu region (excluding remote is Exposed categories include Customer names, service-location addresses, electricity usage data, telephone numbers, retail electricity provider names (contracts Jul 2016–Jan 2024); no bank or card data per com. BreachHistory cites approximately 10.9M+ affected records in this row. See the kyushu-electric-lost-ssd 2026 record and canonical BreachHistory entry.
2024 — up to ~374k customer records potentially exposed
Cataloged incident. English-language summaries of June 2024 reporting describe ransomware against Kyuhen Co., Ltd., a Kyushu Electric Power/Kyuden-linked affiliate handling retail-electricity workflows, with encryption of customer-facing systems and up to ~374,000 personal records cited as potentially caught up in disclosure notices. Exposed categories include Names, addresses, phone numbers in public-impact summaries. BreachHistory cites approximately 374K+ affected records in this row. See the kyushu-electric-power2024kyuhen and canonical BreachHistory entry.
Patterns and analysis
- Ransomware and extortion — appears across multiple Kyushu Electric Power catalog entries; prioritize controls that address this class of failure.
- Cloud and database misconfiguration — appears across multiple Kyushu Electric Power catalog entries; prioritize controls that address this class of failure.
- Record-count hygiene — BreachHistory indexes actor-cited figures separately from company-confirmed totals; read each row's technicalWriteup before treating counts as fact.
- 2026 monitoring — New disclosures roll into this timeline as they are verified or labeled unverified per catalog policy.
What to do if you may be affected
- Step 1: Enable phishing-resistant MFA on every account tied to this brand.
- Step 2: Use unique passwords and a password manager—breach rows often involve credential reuse.
- Step 3: Monitor official company breach notices and regulator filings, not dark-web downloads.
- Step 4: Bookmark the Kyushu Electric Power company page for new 2026+ disclosures.
Canonical BreachHistory hub
Explore every indexed row: breachhistory.com/kyushu-electric-power · Latest: kyushu-electric-lost-ssd2026.
Sources: BreachHistory catalog (2 rows for Kyushu Electric Power), company and regulator disclosures cited in individual breach records.