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Recently, the deregulation and liberalization in power market increase the competition in retail and power sector. Therefore power companies need to reduce operational cost and maximizes the profit by operating generator with higher efficiency. On the other hand, the electrized residences are increasing. So the controllable loads such as electric water heater, heat pump and electric vehicles are introduced to power systems. However conventional system does not operate the thermal units and controllable loads in a coordinated manner. Therefore, the smart-grid has become very popular in worldwide. This paper focuses on the reactive power schedule of the controllable loads, and determines the optimal operation of the thermal units satisfied the voltage constraint. Simulation results show the validation of the proposed method and validate the performance and effectiveness of the algorithm for controllable loads and batteries.