This paper presents a new approach for solving the energy management problem of utility microgrids. In this approach, the rolling horizon concept is utilized to constitute a framework, in which an efficient metaheuristic technique known as the social spider algorithm is used for solving the problem. Before presenting the proposed approach, the mathematical formulation of the problem has been introduced, and the problem is formulated as a mixed-integer dynamic optimization problem. The proposed approach has been applied for solving the energy management problem of a utility microgrid with specifications obtained from the previous literature. The results obtained from using the social spider algorithm are promising.