In Nigeria, access to reliable and stable supply of electricity is a major challenge for both the urban and rural dwellers. In this study, comprehensive review of accessibility to clean and modern energy in Nigeria has been carried out. Also, this paper examines the potential of renewable energy (RE) resources in Nigeria that can be harnessed for continuous energy supply and the government's efforts to ensure RE's sustainability. Nigeria is endowed with abundant energy resources but the existing electric energy infrastructures are unable to meet the energy demands of teeming population. There is imbalance in energy supply and demand in the country. Over the period from 2000 to 2014, there was an average of about 2.35 billion kWh of energy gap between energy production and energy consumption. The highest electricity consumption per capita recorded so far was 156 kWh in 2012. This makes Nigeria one of the country with the lowest electricity consumption on per capita basis in the world. In order to improve access to clean energy supply and achieve sustainable development, this paper pin points the significance of decentralized renewable energy systems and needs for the government to review the policies on renewable energy development in the country.

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A review is done on the indigenous cassava peeling machines made in Nigeria. Cassava is a very important cash crop that can be processed into more than a thousand products. One of the most important unit operations in cassava processing is peeling and its importance can never be overemphasized. Some of the other unit operations in cassava processing have already been successfully mechanized. To all engineers who have been involved in equipment design of cassava globally, cassava peeler has remained a serious problem to them. This study presents the functionalities, prospects, performance assessments and limitations in some of the indigenous cassava peeling machine. Some of the machines that have been made are the knife edge type peeler, double and single gang peeler, automated peeler, etc. Evaluated in this paper are there unique advantages and functional parameters, such as the speed of the machine, output size, efficiency of peeling and tuber loss. The machines have an operational speed ranging from 40 to 700rpm, output capacity ranging from 10.4 to 725kg/h, peeling efficiency ranging from 48.8 to 92.0% and tuber loss ranging from 2.5 to 42%. Peeling efficiency decreases as the speed of all the machines evaluated increase. There was also an increase in the loss of tuber and output capacity as the speed of the machines increases. With an improved cassava peeling process, there is a possibility that cassava cultivation will be encouraged and other uses of cassava will be harnessed. Part of what will be affected are better product quality as there will be minimum loss in tubers and an increased processing time.