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In this paper, we present an energy-efficient data dissemination protocol (EEDD) for wireless sensor networks with mobile sinks. This protocol considers energy-efficient consumption and network lifetime especially to sensor networks with high node density. The protocol is based on grid structure and location aware flooding of sensor networks to gain effective data dissemination between sources and mobile sinks. Our analysis shows that EEDD consumes less energy and has a longer network lifetime compared with other approaches.