Augmented Reality (AR) is a set of technologies that will fundamentally change the way we interact with our environment by enhancing the way we perceive the world. It represents a merging of the physical and the digital domains into a rich, context aware and accessible user interface delivered in real-time through a socially acceptable form factor, such as eyeglasses. AR has the potential to greatly expand the frontiers of human experience, opening new unexplored areas of interdisciplinary applications spanning entertainment, education, medical, industrial, and others. To make AR glasses stylish and comfortable, several multidisciplinary technological hurdles must be overcome. This presentation reviews the key challenges around managing power consumption to ensure both long battery life and a physically acceptable thermal envelope for the user.