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This research paper focuses on modelling and simulation of 330 KV, 600 MW Shiroro Substation in the DIgSILENT Environment for the integration of Hybrid Solar PV – Hydro System to improve power supply in the Federal Capital Territory (FCT) of Abuja, Nigeria. A hybrid energy system is a system that combines multiple types of energy generations to satisfy the demand of the users effectively and efficiently. The Solar Photovoltaic (PV)/Hydro hybrid system consists of electrical energy generated from solar PV and hydro energy. Effect of environmental issues, reduction of fossil fuels in addition to its high cost have actively encouraged interest in great integration of renewable energy sources in power systems. This work capitalized on the possibilities of harnessing commercial solar energy and feeding it to the National grid through a nearby 330 KV substation at Shiroro Dam. The simulation is carried out in DIgSILENT (Power factory) environment. The Shiroro 16 kV, 330 kV, 600 MW Transmission Lines are modelled, and results of simulations of the five bus bars (Jebba, Shiroro, Gwagwalada, Katampe and Kaduna) voltages directly connected to Shiroro Network are: 331.8kV, 331.7 kV, 329.3 kV, 325.6 kV and 332.2 kV, respectively. All the values are within the Operational and Statutory Limits of the National Grid Code.