[majika]

Your electricity usage patterns are enough to determine your schedule, especially if you have electric water heating. Browse through some systems at PVOutput.org until you find one that publishes power usage data; you can usually see when the occupants wake up, when they do their washing on the weekends, when they turn on the TV in the evening, and when they go to sleep.

With higher precision usage readings, you can determine what they're watching on their TV [0] [1].

I agree that the internet-of-things is another concerning layer of risk for privacy and security, though.

[0]: https://nakedsecurity.sophos.com/2012/01/08/28c3-smart-meter...

[1]: https://www.youtube.com/watch?v=YYe4SwQn2GE