Every breath you take: Water and power usage tells if you’re home

TOKYO — Tokyo’s power and water utilities will share real-time grid data as part of efforts to improve services and better inform their response during natural disasters.

Making this possible is the adoption of smart meters, which eliminates the need to dispatch human readers to each home. Tens of millions of these devices are currently installed around Tokyo.

At the same time, critics have raised the prospect of this collaboration undermining personal privacy and opening the doors to a new form of the kind of data oligopoly enjoyed by tech giants.

Tokyo Electric Power Co. Holdings, or Tepco, began its

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