Key facts
- Hackers could shut down grid-connected home battery systems simultaneously.
- Tens of millions of residential devices connected to the grid are potential targets.
Japan's electricity supply is at risk from cyberattacks targeting the vast network of residential devices connected to the grid. Cyberterrorists could exploit these devices, such as smart meters and home battery systems, to simultaneously shut them down, potentially causing extensive blackouts across the country. The Nikkei reported on October 17, 2026, that tens of millions of these devices represent potential targets for such disruptions.