A rapid pace of economic development in Malaysia has resulted in an increase in demand for energy. For ensuring continuous development could be performed without any disruptions, effective and sustainable energy are of utmost imperative. Effective and sustainable energy must consider two main aspects named as access to affordable modern energy services for those countries that are lacking, and a continuous/reliable supply for the mixture of energy resources as well as technologies (efficiencies) that could minimize damage effects to the environment. All the urban and rural areas in Malaysia have no issue with access to energy specifically electricity, hence, the major concern is related to the security and reliability of energy supply and the diversification of energy resources. Thus, this book describes the available energies in Malaysia and related matters including energy production/generation and conversion focusing on the conventional (oil and gas) and renewable energies.