Smart utility meters used to monitor energy consumption can be used to invade your privacy. Data recovered from smart meters can reveal information about which appliances you are using, what tv shows you're watching, and even whether the dvd you are watching is copy-protected or not.
"Researchers from Münster University of Applied Sciences were previously able analyze smart meter data to identify the power consumption activity for a refrigerator, stove, and television. They showed that the type of LCD TV set could be identified, what TV program was on, or if a movie was playing from a DVD or other source. The research team called for a tightening of data protection regulations. Building upon that, the 28C3 presentation "Smart Hacking For Privacy" demonstrated that consumers can be identified via the data collected by a smart meter, from the types and amount of your devices, your TV shows, to scanning for copyright-protected (or pirated) movies being watched."
On the other hand, it only took amateur hackers two days to hack the data of a smart meter and fake the readings. A hacker could then presumably fake readings to show that no energy was being consumed at all.
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Privacy and Security Fanatic: Hacking For Privacy: 2 days for amateur hacker to hack smart meter, fake readings
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