Power consumption correlated with commercial breaks tells you what show somebody is watching. Power consumption correlated with 9-5 tells you if somebody is working from home. Power consumption correlated with a specific time in the morning tells you when somebody wakes up and subsequently turns the heat on. Lower power consumption over several days tells you when somebody is on vacation.

Are these relatively minor invasions of privacy compared to what advertising companies perform? Yes. But that's no reason to pretend that they aren't privacy-hostile moves on their own.