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Is it OK to leave device chargers plugged in all the time? An expert explains
(theconversation.com)
this post was submitted on 27 May 2025
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That's pretty much it. Maybe even tens of cents. In pre-USB era that actually made sense, Nokia chargers with a barrel jack (and other that era wall-warts) consumed even several watts on idle but (assuming a good quality) modern USB-bricks are way more efficient. They still consume a non-zero amount of power when plugged in but you're not going to see that on your power bill. You'll waste far mor energy if you forget your bathroom lights on overnight, even with LED bulbs.