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802.15.4/ZigBee is one of the most promising technologies for wireless sensor networks (WSNs) and energy efficiency is a very important issue for WSNs. In this paper, the energy consumption for the ZigBee-based WSNs is modeled and analyzed for potential applications aiming at reducing energy waste. First, a power consumption model for a single network node in different 802.15.4/ZigBee operations is presented. Then the procedure and the energy consumption model of networking with tree topology for a large number of nodes is proposed. Finally, the energy consumption model of a wireless sensor network is deduced and tested.