Over the past several years, power demand is immensely increasing in isolated mode or grid connected mode of applications continuously due to the growth in demand of various classes of consumers like domestic, industrial, agricultural, and etc. To meet this, various conventional power plants are operating by using fossil fuels as major resource. But in future, these resources may evaporate, and need to look for the availability of alternative energy sources, and hence renewable energy based hybrid power system is designed. Combining several different types of power sources will forms a system, which is known as "Hybrid Power System”. This book gives an overview of different architectures of HPS and also energy, load forecasting, and maintenance scheduling of the plant by using Artificial Neural Networks (ANN).