Well a few years ago, we got the Sense utility monitoring system. This has induction rings that go around the mains power of your house and then it transmits via WiFi to the cloud. This thing is great and has been really reliable. It attempts to sense various devices by their power usage and estimate how much you are using.
But, the really useful thing is that they have a web applications home.sense.com which has all the data and if you go to Dashboard > View Detailed Usage at the upper right they have Export so you can get all the data in CSV.
It appears to only store the last four years worth, so every year, I download the complete data set for grins.
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