Hi Bobbbo. I have done some testing with my kill-a-watt here at my college and one was that a macbook pro (or macbook's pro) uses about 2 watts of power when in standby. I did all this because my college (Northland College in Ashland, WI) leaves its computers on 24 hours a day M-F, and about 8 hours on weekends, and being in the environmental council, I wanted that changed, so I started compelling number to prove that it would be better to turn them off. I have found that if we go from current usage to optimal usage, we would save about $8000 for the systems alone...not including monitors. (Note that our college has a population of about 750).
Below is some numbers that I have copied out of an excel file for your view pleasures. Sorry if it looks funny now. the first one is my macbook pro, the second item is my imac 20 inch.
On Power Off
Backlight Full or for desktop Backlight at lowest Backlight off Screen Off Averages Estmated power Estmated pow
User Maker Screen Size Processer Low Processor Hig Processer Lo Processor Hig Processer Low Processor Hig Processer Lo Processor Hig Processer Low Processor Hig Standby Hibernate Shutdown usage per year cost per year
Travis Apple 15w 28 41 21 36 21 35 18 33 22.00W 36.25W 2 1 132.23 KWH $10.92
Travis Apple 20w 73 85 50 62 36 48 53.00W 65.00W 2 1 313.14 KWH $25.86
Ok, it looks really bad, sorry. Let me do this...I uploaded it to my website and you can get directly to it by going to
http://travisjames.50webs.com/Print_Area.htm (no WWW...its a weird site). The two other computers listed are laptops. the reason an iMac is on this page is because it has the monitor plugged directly into the system and is using the same power source. When I get a chance, I will put everything I have up there so you can view all my data.
From the guy with his eye on the sky, Travis