Increasing the penetration of renewable energy sources (RES) in energy systems has had an impressive impact on the design and scheduling of future energy networks and the transition from traditional networks. Sizing and placement of these resources has important technical and economic impacts on the network. However, utilization of these resources in Active Distribution Network (ADN) has several advantages and so, the undesirable effects of these resources on ADN need to be investigated and improved. In this paper, a hybrid ADN includes wind/ PV/ESS, which has been located in 33 IEEE standard bus, is investigated. Optimal energy management and sizing of the RES and ESS are the purposes. Demand Response (DR) is another good option in active networks for regulating production and demand. In this paper, an incentive-based DR program is used. However, this method has uncertainty because it is dependent on customer consumption patterns and the use of inappropriate incentives will not be able to stimulate customers to reduce their consumption at peak times. The optimization problem, which is formulated as optimal programming, is solved to calculate size and placement of each RES as well as ESS condition considering with power losses, voltage profile and cost optimization. The results show the effectiveness of energy management and cost reduction in the studied grid.