This paper presents the Graphical User Interface (GUI) for the Stochastic Optimal Power Flow (SOPF) in deregulated power markets. SOPF is a C++ software package that incorporates a probabilistic approach for the evaluation of composite reliability of generation, load forecast and fuel prices using different probability distributions. GUI is a Visual Basic package incorporated with Microsoft Access and PowerPoint for visualization. GUI provides several simple user interface screens for handling the inputs, processes, and results. Several screens are designed and presented in this paper to show the crucial role for the GUI.