In the UK the electricity meters get read once a quarter. Smart metering (if the public accept them) enables continuous monitoring and potentially down to specific devices.
In theory it should help power planning. In practice I'm skeptical. I've visited a few power stations and they are pretty good at predicting demand. People are creatures of habit.
Apparently the next generation of cars will generate 2TB of data a day. God knows what that will be. Again there are far less intrusive ways for potential users of that data to get what they need. Perhaps a different approach will make that 2TB a day irrelevant. For example
http://www.streetbump.org/about
Organizations, governments and companies are becoming drunk on data. Magic cure-all.
[A while back a Ford executive got a lot of backlash for quipping 'we know when you're speeding'. But the implications buried in that statement are frightening.]
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-- FORTRAN manual for Xerox Computers --