Grab a Kill a Watt meter or something similar off Amazon and it will pay for itself. I have a TV with peripherals upstairs I don't use much, and it was drawing 40W just sitting there all the time. Same with a speaker system in the garage. I just turn the power bar off now. I had no idea until I had the meter.
If you have lots of electronics, the old wall wart plugs draw power even when not in use. Pretty easy to go around your house with one of these things and decide what you really do want to keep paying power for.
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