If an unused phone charger left plugged in apparently costs me money as its using my electricity, how does this not apply to a socket outlet that has a built in USB.
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A pair of USB outlets built into a double socket may consume in the region of 0.1W on standby. Over a year this adds up to about 1kWh, which from October would cost about 50p. Multiply that by how many pairs of USB outlets you have.
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