Green IT - Save planet and power while keeping it manageable

We have recently done our small part in caring about our planet and deployed a cross-platform green IT infrastructure across our network (~450 desktops). Basically this means that machines are off out of working hours, if nobody is using them (which ends up being around 60% of all desktops). Should somebody need a machine when it is off, then it can be woken up remotely. This sounds like a simple task, but is actually trickier than one might first think. Especially when it comes to cross-platform solutions for determining if somebody is using the machine or managing wake-on-lan.

Keith has summarised all the technical details on https://www.maths.ox.ac.uk/notices/it/green-it/technical-implementation , which is a worthwhile read for anybody who is looking into the same sort of issues.