I’ve just had a smart meter installed month back and my grow uses 10p an hour at 400w and 12p an hour 600w (that includes all my household background stuff as well like fridge and things on standby).
That’s 6” exhaust fan, 4” in-line fan, two desk fans and a hps light.
My gas and electric used to be about £50 a month living on my own but it’s now £85
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