Photovoltaic is direct conversion of sunlight into electricity through electronic means that occurs at atomic level of semiconductors materials. It is neat, silent and elegant process of generating electric power in environmentally friendly manner. In this paper, the design analyses roof-mounted Grid-connected 148.5kWp Photovoltaic System with Energy Storage for use in a Local Government secretariat in Nigeria. The design was simulated using PV*SOL software to evaluate the system's production performance and to know the amount of electric power generation for every day of the year. The result shows that the PV system's daily production far exceeds energy demand in the building. The maximum monthly demand is 2893.22kWh while the least energy production is 13,802kWh which occur in July. The highest production occurs in November with 20,258kWh; followed by March energy yield of 20,053kWh. Hence, the system could serve as good revenue source for the government by exporting more than 75% of the power generated to the grid in exchange for good cash from electricity utility; while at same time serving as motivation for home owners in the community as well as other governmental offices to generate some or all of their energy need.

It is not enough to have power supply. The characteristics of supply voltage at all-time are very essential for smooth operation and service-life of equipment. The voltage characteristics determine the quality of the power supply. The degree to which the supply voltage characteristics conform to the acceptable standard is referred to as Power Quality. With ever increasing use of power electronic devices in domestic and commercial settings as well as sensitive equipment in the industries for automated production, the need for maintaining good power quality has become necessary. This paper elucidates on Power Quality as well as issues associated with it. The causes and consequences of power quality problems are discussed. Techniques for mitigating power quality problems are presented.

Nigeria has fairly adequate endowment of energy resources, yet the country is lagging behind in terms of access to reliable and affordable energy supply. The country faces serious challenges as a result of declining electricity generation from domestic power plants. This steady decline has led to a near failure of the electric power sector. Electricity supply required to place Nigeria on the path of economic growth and sustainable development is in very short supply. The country has just 45 electrification rate, with only 54.7% of her population electrified as at 2016. More than 80 million people are still without access to electricity with frequent power failure. This has contributed to the slow economic growth currently experienced in Nigeria. Regular power supply is the hallmark of a developed economy. Nigeria is blessed with energy resources which could be harnessed to provide various modern energy services and which could have played essential role in the effort to alleviate poverty in the country. There is failure to mobilize the required resources for the development of energy resources in Nigeria. Around 1,500MW of Nigeria’s hydropower potential is currently being used, contributing to about 30% of the total amount of electricity produced. The large amount of gas associated with oil exploration operations is being wasted through flaring instead of being valuably used for power generation and industrial processes. Current patterns of production and consumption of energy are not sustainable. This paper highlights the importance of sustainable electric energy development in attaining sustainable development in Nigeria.

Regular availability of electricity is fundamentally important for everyday running and productivity of any organisation. In any modern society, stable and reliable electric power is a basic need, without which living condition becomes substandard and smooth business operations become difficult. Unreliability of power services in Nigeria is taking its toll on administrative, academic and research activities at Federal Polytechnic, Ede, just like other institutions in the country. Diesel generator on which the institution depends for alternative power source during outage is not sustainable as outage is too frequent and the duration is usually long, at times for days. This results in a very high running cost if normal activities in the institution are to go unimpeded. This work is on the design of 172.84kWP Solar Photovoltaic (PV) System aimed at permanently addressing the electric power challenges at the Administrative Blocks of the Federal Polytechnic, Ede. The proposed project’ design was simulated and the results show that its real life performance is highly promising. The least energy yield of the PV system occurs in June with 549.93kWh/day as against the maximum demand of 457.30kWh/day. The system performance is much higher in the months of September to March as solar irradiance is higher in these months. The PV plant has active service life of over 25years without significant change in its efficiency. The benefits of the proposed project are manifold. The project if implemented will solve the electric power problem of the institution at the Administrative’ Building by providing stable, adequate and reliable 24-hour a day electricity. The estimated cost of the proposed project is N45, 000,000  which is much cheaper than diesel generator and interestingly, is appreciably less than the cost of unreliable power supply from the grid. Keywords: Energy yield, off-grid, photovoltaic system, solar electricity, solar photovoltaic

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