Steven Sinofsky posted a new entry in the Building Windows 8 blog about the broad topic of developing an OS to reduce power consumption

Battery life and power consumption continue to be some of the most important topics in the computing industry. We wanted to give you a look at how we think about power management for Windows 8, and how we measure power consumption on a daily basis. We consider power management a core OS capability that is critical on any chip architecture and any PC form factor.

  Building a power-smart general-purpose Windows