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My computer consumes 1 to 2W when switched off!
I bought a plug switch and turn it off so it now consumes 0W when switched off.
Some people think there is a spike when the computer is turned on. There is none. If it takes 30 sec to shut down and 2 minutes to boot and you leave for 5 minutes, you will save energy if you switch it off. It's nothing like a diesel motor, not to mention that what people think about modern diesel motors is also false. Switching your motor off is also worth it.
If you are using a laptop as a desktop replacement, like mentioned in the article, and it is plugged to the wall, please, pretty please, remove the battery! You don't use it and you are charging it. There is an insane loss of energy to store it, then your battery will loose that energy over time by heat when the computer is turned off. Moreover your battery will live longer if you don't waste your limited cycles.