Payback period was located to be 1.01 years, which shows that the replacement of HPS lamps with LED lamps is definitely an economically attractive decision. Commonly, projects having a payback of much less than 5 years are very advisable; in this case, it’s just 1.01 years. Based on sensitivity evaluation considering varied prices of LED lamps and electricity price, the authors very advise the replacement of HPS lamps to LED lamps in regions together with the high cost of electrical energy as the discounted payback period is even much less than a year. Even in areas with low electricity expenses and higher expense of LED lamps, it really is nonetheless economically feasible having a payback period less than 3 years. Furthermore, replacing HPS lamps with LED lamps in a modest streetlight system, as shown by this study, leads to the reduction of 106.876 tonnes of CO2 emissions. This shows the high significance of replacing energy-inefficient streetlight lamps with energy-efficient LED lamps to minimize millions of tonnes of CO2 emissions worldwide.Energies 2021, 14,21 ofThe second a part of the paper considers optimal sizing of PV/battery method to get a new streetlight method with LED lamps. Primarily based around the optimized sizes of panels/batteries, the life cycle cost of PV/battery program required to energy the new streetlight technique extending a stretch of 8.55km is 81658. The cost per kWh of generated power is estimated to be 0.097 /kWh which proves that the technique is economically feasible to be implemented in Oman exactly where the existing power cost is 0.078 /kWh. With escalating cost of energy prices and decreasing the cost of renewable power elements, the proposed methodology will prove to become extra promising and economically attractive in addition to minimizing the CO2 emissions to zero. To study the practicality of implementing energy-efficient approaches in street lighting program, local governments can adopt the presented methodology. This is determined by the geographic functions with the place, availability/cost of LED lamp, expense of renewable power components and electrical energy cost. The methodology is comprehensive and adoptable by any place, taking into consideration the numerous elements current in the selected area. Extra study is necessary inside the control side of LED lamps such as the housing and driver circuit with detailed evaluation of LED lamps. Intelligent streetlight systems thinking of light pollution and driver comfort is yet another technical aspect to become regarded as inside the methodology for extra power savings and CO2 BRD0209 site emission reduction.Author Contributions: Conceptualization, R.A.A. and R.G.A.; methodology, R.G.A.; software, R.G.A.; validation, R.A.A., A.M. and also a.A.-H.; formal analysis, R.A.A., A.M., A.A.-H., R.G.A.; investigation, R.G.A., A.A.-H.; sources, R.G.A.; writing–original draft preparation, R.G.A.; writing– review and editing, A.M., R.A.A., A.A.-H.; visualization, R.A.A., A.A.-H., A.M.; supervision, R.A.A., A.A.-H., A.M.; funding acquisition, R.A.A. All authors have read and agreed to the published version in the manuscript. Funding: The APC was funded by Sultan Qaboos University. Institutional Overview Board Statement: Not Applicable. Informed Consent Statement: Not Applicable. Acknowledgments: The authors would like to thank the maintenance department of Sultan Qaboos University, Oman, for Sarcosine-d3 In Vitro supplying enough information, which made this function extra practical. Conflicts of Interest: The authors declare no conflict of interest.NomenclatureEnergies 2021, 14,22 ofSSL HPS LED PCB PV CFL ROI NPV TR S E W CoU Mf LLD LD.