In this chapter, the advantage of distributed generation can be seen in terms of system reliability and reliability of customer load. The solar photovoltaic (SPV) system is one of the distributed generations that may lead to the supply of electrical energy. The customer at the site of load demand mainly uses the SPV system. The installation of the SPV system is advantageous for the electrical load demand. Solar systems have greater efficiency for supplying both types of load (i.e., thermal and electrical) simultaneously. The modeling of two power system components (i.e., generation and distribution) can be performed using the Monte Carlo simulation (MCS) technique. The data used for generation modeling is taken from IEEE-RTS (reliability test system) and data for the distribution system is obtained from IEEE-RBTS (reliability busbar test system). The reliability parameters such as average energy not supplied (AENS) and loss of energy expectation (LOEE) are evaluated for the analysis of individual customer reliability and overall system reliability simultaneously.