Japan’s electricity grid faces growing threat from millions of vulnerable home devices

Smart meters and home energy storage units identified as vulnerable points for cyber attacks.

Hackers could simultaneously disable grid‑connected home battery systems, potentially triggering a large‑scale blackout. (Nikkei montage)

SHIMPEI NAKAMURA

October 17, 2026 03:55 JST

TOKYO — Cyberterrorists aiming to cripple Japan’s electricity supply now have a vast attack surface of tens of millions of residential devices linked to the grid, including smart meters and home battery systems.

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