The increasing demand for renewable energy from sources such as wind and solar has attracted the researchers to study the behavior and attributes of these energy resources in more depth. One of the important aspects of renewable energy resources is their uncertainty/unpredictability. To have a balance between the power demand and generation, it is important to know how much power could be generated in the grid at any time to avoid shortage/loss in the grid. The power generated by solar arrays mainly depends on the availability of the solar radiation.