What's New in Power Management
Windows 10 Technical Preview helps your application optimize power consumption when it's running on a mobile device.
In this release, your application can be notified when battery saver is engaged or disengaged. By responding to changing power conditions, your application has the opportunity to help extend battery life.
SYSTEM_POWER_STATUS : This structure has been updated to support battery saver. The fourth member, SystemStatusFlag (previously named Reserved1), now indicates if battery saver is engaged or not. Use the GetSystemPowerStatus function to retrieve a pointer to this structure.