In this paper we studied the various renewable energy resources & which will be used for the development of electricity. The main source of energy is solar energy, wind energy, hydro energy. This paper provides a review on the hybrid power generation i.e. combination of two or more energy sources. The hybrid power generation systems will in turn be used for charging the batteries. The Hybrid (Wind / hydro / solar) system is more economical, environmental friendly. The power generation capacity of hybrid system is more than the power generation capacity of the individual system. The results showing the power output of individual system and hybridized system obtained from Metrological Station for the period of five years 2010-2015 is used for comparison between the different hybrid systems.