The wasted energy comes because the screensaver requires additional computational power, which in turn requires energy. Screensavers can be turned off in Windows using the Display option in the Control Panel.
A more sensible “Power options” setting calls for the screen to turn off and the computer to go into Standby or Sleep mode after a certain period of inactivity, such as 15 minutes. That both saves energy and prevents the screen from unnecessary use - the original intention of the screensaver.
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