The prosumer market, where energy surplus can be sold to other consumers or utility, has emerged with the increasing penetration of renewable energy sources. The energy management system (EMS) plays a key role in the prosumer market environment by controlling and operating dispatch-able sources-for example, the energy storage systems (ESSs)-to achieve operational goals such as economic or stable operations. The paper, in this context, proposes the coordination scheme between day-ahead optimizing planning and real-time operations of the ESS, aiming to achieve economic benefit-reducing operational costs-and contract fulfillment-providing designated power to, especially, grid-connected industrial complex at peak-load conditions. All in all, the ultimate goal of the proposed methodology is to maximize the profits of prosumers by controlling the ESS in various operating conditions. The paper also presents case study with a test-bed of prosumer market to validate the proposed method. As historical data for day-ahead optimization, actual field data recording power generation of renewable energy sources and load consumption of an industrial complex are used. For day-ahead optimization, quadratic programming is used that minimizes operation costs as well as prevents battery deterioration.