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I’ve had a smart meter for a while now, and have a look at the 30 minute usage data every now and then. I’m with octopus so this is easy to download. But there are other apps such as glow that I’ve used too. Before I had a heat pump I got to understand what my overnight base load was, (fridge freezer, internet router, some monitoring kit on 24/7 etc.) and then made a note of when I did laundry, used oven, watched tv etc during the day and compared with overnight baseload. You can get a good feel for what the different appliances use (as long as you’re not doing everything at once of course!).