Sensor networks are composed of a large number of densely deployed sensors/actuators. Routing protocols are faced with the challenge of delivering data to sinks through multihop routes, in the presence of energy constrained sensor nodes. We present an energy-aware event dissemination protocol for mobile wireless sensor networks. In our proposed model each sink pro-actively constructs a redundant tree in the network to provide reliable delivery of events in the face of dynamic changes and mobility. Scalability is achieved by minimizing the number of participating nodes on the tree, while maintaining high coverage.