Edison is described as 'puts you in control of your PC energy usage by letting you:
Set your schedule - Tell Edison when you use your computer most'. There are four alternatives to Edison for Windows, Linux and Mac. The best alternative is Granola. It's not free, so if you're looking for a free alternative, you could try Jupiter Applet or Boray POWer.
The list of alternatives was last updated Oct 31, 2011
Verdiem delivers enterprise-class IT energy management & efficiency solutions for PCs, Macs, and Cisco EnergyWise devices – providing greater energy savings and IT efficiency. View 7 alternatives to Verdiem