Even your machines need to sleep now and then-

“Activate sleep settings on all printers, copiers, fax machines, scanners, and multifunction devises so that they automatically enter a low-powered sleep mode when inactive. Use the owner's manul to make the setting changes yourself, or ask your service vendor to ensure your machines are configured to take full advantage of these features.”

https://www.energystar.gov/buildings/facility-owners-and-managers/existing-buildings/save-energy/stamp-out-energy-waste