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Deployments of renewable energy technologies in the current century represent a critical approach to sustainable development. Renewable energy can be generated from sources with the backdrop to restock themselves based on timescale. The most important sources of renewable energy include solar photovoltaic conversion technologies, biomass and biofuel energy systems, wind energy turbines, geothermal energy technologies and hydroelectric power systems. Considerable investment in renewable energy in a country can lower the nation's dependency on imported fuels and purchase of energy from foreign market. It also drives technological innovation and generate employment scheme while enhancing clean development mechanism. Consequently, this paper presents the existing renewable energy technologies in the Nigeria and as well makes some critical recommendations to further induce development of renewable and sustainable energy systems based on autonomous energy systems and microgrid (µgrid) technologies. The recommendations are made based on varieties of energy technologies for solar power generation, biomass and bioenergy, wind energy, hydropower generation and the combined generation systems using hybrid energy mechanism. The structure of the study is concluded based on suggestions on how to pursue some impending socio-political, technological, investment policy and legislative issues for effective renewable energy development in the country. [ABSTRACT FROM AUTHOR]