It is widely being acknowledged that renewable energies will become important in future and we are already getting a glimpse of that now.In order to study the impact of penetration of new and renewable energy technologies in a regional economy,under a planning and policy analysis context,-it is often desirable to have a unified framework which integrates all forms of energies,both conventional and renewable,that have reasonable potential of being harnessed.This integration has been achieved here by developing a multisectoral intertemporal optimizing model which allows the study of interactions between the energy sector and the regional economy and thus would be a valuable tool for energy planning and policy analysis.Equity related goals could also be introduced into the model,as shown in the book while assessing the impact of gap reduction in per capita household energy consumption as heat between rural and urban areas.The working of the model has been demonstrated by energising it with data from the state of Karnataka,India.The energy policy analysts,the regional planners,and students including practitioners interested in applications of optimizing models should find this book useful.