This paper focuses on the sustainable power supply and ways to enhance it that will culminate into economic growth now and even in the future, it highlights the importance of sustainable power supply as catalyst to economic development and examines the works of some experts in the area. It also discusses the Nigeria’s under development as a contribution of the inadequate and unsustainable power supply to it, stressing sustainable power supply as a tool for “Economic Growth and Development,” which seems to be mirage presently. The paper having examined the Renewable Energy Sources (RES) as an option for achieving sustainable power supply in Nigeria, it then concluded that Nigeria as a country should encourage the implementation of energy mix involving conventional and renewable technologies to increase power supply that will achieve rapid economic development and generate employment capabilities for its teeming youths, thereby reducing insecurity and other crimes related vices. Keywords: Sustainable power supply, energy mix, renewable technique, Economic growth