Abstract : Power consumption is one of the most constraining re-quirements for the design and implementation of wireless sensor networks. Simulation tools allow one to signifi-cantly decrease the effort and time spent to choose the right solution. Existing simulators provide varying de-grees of analysis for communication, application and en-ergy domains. However, none of them provides enough flexibility to estimate the consumed power for a wide range of wireless sensor network (WSN) hardware (HW) platforms. In this paper we present a flexible and exten-sible simulation framework to estimate power consump-tion of sensor network applications for arbitrary HW plat-forms. This framework allows designers of sensor net-works to estimate power consumption of the explored HW platform which permits the selection of an optimal HW so-lution and software (SW) implementation for the specific projects.