energy saved
how much power is saved when the iMac computer is sleeping?
iMac 21.5″, macOS 10.15
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See the chart linked below.
iMac power consumption and thermal output
https://support.apple.com/en-us/HT201918
Generally speaking, iMacs are very energy-efficient. Turning them off will save some energy, but there are also good reasons to leave then always on. For example, during idle time is when macOS performs most of it's background maintenance tasks.
