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Last decade has witnessed wide growth of Mobile ad-hoc networks (MANETs). MANETs work well as a temporary fallback mechanism if normally-available infrastructure mode gear (access points or routers) stops functioning. Due to this, ad-hoc networks have gained wide popularity. However, Energy is a limiting factor in the successful deployment of ad hoc networks since nodes are expected to have little potential for recharging their batteries.. In this paper, we will review various techniques used for achieving energy efficiency. Protocol stack plays important role in functioning of any protocol. So, an attempt has been made to correlate various layers with power, to get better understanding by our future researchers in order to achieve efficient and effective power optimization.