Turn electrical items off at the plug#
Standby on electrical items was wasteful in the 1990s up to around 2005. All appliances since 2013 have good standby behaviour (1W), so savings are minimal.
However, if you have smart TVs, computers, and games consoles that are by default always on to check for software updates, that’s worth changing. You want any security updates, but you don’t need the device on all the time to look for them. If it’s hot and it’s not meant to be, it’s wasting energy.
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