Load flow algorithms for power distribution systems (PDS) differ from those for transmission systems due to unique topological characteristics. The integration of renewable energy sources with electrical power systems has gained significant interest in recent years, offering environmental and financial benefits. However, this integration introduces additional uncertainties, requiring suitable uncertainty models for power systems. This paper covers both deterministic load flow (DLF) and probabilistic load flow (PLF) techniques. The IEEE-33 Bus system is utilized to assess uncertainty in line and load data. The results indicate favorable outcomes in terms of improving voltage profiles and reducing actual power losses.