Synopsis:
In keeping with the resource conservation goals of the Sustainability Plan adopted by the University in February 2008, OIT has launched a power management project in order to reduce the amount of energy used by desktop computers on campus overnight. It is estimated that putting over 2000 computers to "sleep" at night, 5 days a week, can conserve over $75,000 a year in electricity (translated to approximately 750,000 KWh of energy saved annually).

Solution:
OIT has implemented this power management strategy on all University-managed Windows computers (also known as DeSC computers). If you are a staff or faculty member and have a DeSC computer on campus, the following information will answer questions regarding this project to reduce the carbon footprint in your office.

Definition of hybrid-sleep power management mode
In hybrid-sleep mode, the system saves any open documents and programs to memory and to your hard disk, and then puts your computer into a low-power state as in normal Sleep/Standby state. One advantage of hybrid-sleep is that if a power failure occurs, Windows can restore your work from your hard disk. If a power failure such as power outage occurs when your work is saved only to memory (as in Sleep mode), all work is lost.

What changes will I see once my machine is power-managed?
From 7 a.m. until 7:00 p.m. during the day you will not notice any changes other than a new Nightwatchman icon in your System Tray (circled in the image below). If you come into your office before 7 a.m. on a weekday you will need to power up your computer by pushing the power button. The machine will be available to you for login within a minute. If you stay in the office after 7 p.m., the machine will stay active as long as it is not left idle for more than 60 minutes.

What is the DeSC power management strategy?
Nightwatchman will power down all DeSC computers on campus using the following schedule:

• Monday- Friday Power down 7:00 p.m.
• Monday - Friday Power up at 7:00 a.m.
• Backup Windows computers Saturday 6:00 p.m. - Sunday 6:00 a.m.
• Power button or Web Wakeup can be used anytime during the power down window to power up the computer.

How can I keep my computer active for the night if I leave before 7 p.m.?

• Right click the Nightwatchman systray object
• Select Keep Active from the action menu
  
• Select the number of hours to keep the machine awake.
  

To remotely wake up your PC power-managed computer from home or another off-campus location and connect remotely

• Log in to VPN (if you have not already).
• Go to https://wakeup.princeton.edu
• Select “Continue to Web page” when you see the “"There is a problem with this Web site's security certificate." You will be redirected to the web wakeup page.
• If you are presented with a logon window, authenticate using the Princeton\netID syntax and use your University netID and password.
• You will need to know the name of the DeSC machine that you want to wakeup.
• Follow the instructions to wake up the machine.

• To then log in your office computer using Remote Desktop, see the instructions at: kb.princeton.edu/2832.

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