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of a HOMER based techno-economic assessment of an electricity supply option based on a hybrid system comprising of a PV component, a diesel generator (DG) and electricity grid have been presented in this paper. The study includes analysis of electricity unavailability data for 132 locations in India spread over state capitals, district headquarters, municipal areas and villages. The values of Net Present Cost (NPC) and Cost of Electricity (CoE) have been estimated for 25 selected locations in the country and a comparison with corresponding values for conventional alternative (grid+DG) has also been presented. The study internalizes all relevant location specific parameters. The values of NPC and CoE are lower in the range of 9.5%–36.6% and 16%–33.6% respectively for the proposed system (grid+PV+DG) as compared to conventional system at all 25 locations considered. The inclusion of PV component results in reduced purchase of grid electricity and much lower hours of operation of DG. • Analyzed real-time hourly grid power supply outage status for outdoor telecom towers at 132 locations • Designed optimal hybrid systems for powering BTS in telecom towers at 25 selected locations in India, • Presented a detailed techno-economic comparison of solar PV based hybrid system for powering BTS • The values of NPC and CoE are lower in the range of 9.5%–36.6% and 16%–102.4% respectively for the hybrid system • The PV component results in reduced purchase of grid electricity, DG operation, electricity fed to grid, and CO 2 emissions [ABSTRACT FROM AUTHOR]