Files linked to India's largest nuclear power plant, Kudankulam in Tamil Nadu, were published online in July 2026 after a ransomware group attacked one of the plant's contractors, Reliance Group. Reliance confirmed a partial breach of data on a server hosted by a third-party data centre provider and said the government had been informed.
Key facts
- Reported: mid-July 2026 (Reuters)
- Group: World Leaks
- About 19,000 Kudankulam-related files among 858,000 Reliance files; 14.3GB, online since June 11
- Documents dated 2016 to mid-2025; Reuters could not verify their authenticity
What was exposed
The files reportedly include purported blueprints of parts of the facility, supplier details, meeting and inspection records, equipment reviews and insurance policies.
What Reliance said
Reliance said there was a partial breach of its data on a server hosted by Yotta, a third-party Indian data centre provider, and that it had informed the government. It did not say what data was affected.
Why it matters
An official at the Nuclear Threat Initiative said the breach could pose a serious risk to the plant's safety. Reports said NPCIL was discussing the incident with Reliance and that CERT-In was examining the claims. No official statement said the plant's own systems were affected.
Frequently asked questions
Was the Kudankulam plant itself hacked?
Reports describe a breach at contractor Reliance Group, not the plant's own systems.
Who published the files?
The World Leaks ransomware group.
Sources: Business Standard, Al Jazeera, Free Press Journal.
Correction (October 26, 2026): This article has been rewritten with confirmed details, and a duplicate post has been merged into it.
