Thanks for the links I should've found myself, narrow minded and lazy.
Anyway if I understand and idle=sleep on idle 24/7 365@165watts x .11 kwh = $158.56 per year just to have it on without using it. Then add some $ for cooling the BTU's and the time it is not asleep/idle then my range is probably 2 to 3 hundred a year?
As others have noted that probably rules out repurposing it as a media server. Synology DS212j. 17.6W (Access); 5.5W (HDD Hibernation); I figure would cost $7.20 per year on 24/7 hibernating 20hrs per day, access for 4hours per day. Anybody wanna trade a synology for a Mac Pro g5ppc?
Your suggestion would save me $200 per year!Install an SSD and shutdown instead of sleeping, this will initially cost you a bit although SSD's aren't that expensive anymore.
Startup takes mere seconds, you'll safe quite a bit by doing this and,as an extra, it is greener.
Edit: Just realised it's ppc but even on a ppc it should make a difference.
For the money you would have spend on electricity in a year you could almost buy a new base Mac Mini and use that as a server, or a 2010-11 model, refurb could also be an option.
Your suggestion would save me $200 per year!