Abstract: Increased penetration of renewables to the transmission network with energy storage systems has increased the need for extended reliability assessment of load points of transformers and transmission lines. Solar power intermittency limits its significance in maximum integration and dependence by utilities. Therefore, its necessary to determine PV and energy storage levels to improve essential infrastructure reliability. The essential component’s reliability is greatly influenced by the location PV and BESS. In this paper, the Markov modelling technique is adopted in designing both photovoltaic systems and BESS stochastic models.