Energy consumption of the medium access control (MAC) algorithm is one of the key performance metrics in today's ubiquitous wireless networks of battery-operated devices. We concentrate on random access MAC algorithms called Collision Resolution Protocols (CRPs) that have the best stable properties and excellent delay characteristics for a large population of ``bursty'' users. The main concern of the analysis of CRPs has so far been the stability conditions, the throughput-delay tradeoffs and how the algorithms can be optimized