Due to the incorporation of intermittent renewable resource uncertainty level is increasing in power system which in turn affects overall schedules of a generating unit, results in load shedding, expensive generation schedule in unit commitment. Recent challenge is to provide the model uncertainty level with in power system. As the operational reliability depends on the uncertainty level of intermittent sources, the effective modeling gives effective scheduling. Most of the recent work is based on developing a new model for this stochastic unit commitment approach. Many scenarios generation methods and reduction methods have developed in recent years. This paper gives about the survey of various methodologies to model the stochastic nature of unit commitment and various solution methodologies to solve stochastic optimization problems. This literature may pave a new way for both regulated and deregulated market and also provide a good pathway to develop the effective smart grid technology with greater reliability. © IJSTR 2020.