My local power company installed a smart electric meter at my house recently. Now, by going to https://www.smartmetertexas.com/CAP/public/ I can see my electricity usage down to 15 minute intervals. It's really neat stuff, and my usage doesn't look at all like I expected it to. This is really cool data and I think I can actually use it to lower the amount of electricity I use.
If you've got a smart meter at your house, it's totally worth checking out your usage. Even if you don't want to nerd out and start making fancy graphs and calculating trends, you can see how your house behaves while you're gone, and maybe save a few bucks on your electric bill.