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The government is targeted to a renewable energy mix of at least 23%. The contribution of generating capacity from solar energy is equivalent to 6.5 GW of the total renewable energy generation capacity of 45 GW by 2025. Solar energy has the potential of more than 200 GW with the efficiency of photovoltaic technology currently available. However, the use of solar energy in electricity generation is still less than 100 MW. The aim of this study was to analyze the difference in the cost of litric bills before and after PLTS installation, determine the speed of return on investment in roof PLTS installation, describing the impact of roofing PLTS installation on customers, PLNs and the government. Research results on 450 VA power customers before PV = Rp. 63,154, after PV = Rp. 53,681 and at 900 VA power customers before PV = Rp. 110,362, after PV = Rp. 66,811. So that it is converted to savings in electricity subsidies for 450 VA of Rp 9,473 and 900 VA of 43,551 of each month. Average capital return time for 450 VA and 900 VA power is 9 years. The impact of diverting electricity subsidies can be used to divert subsidies to other sectors, and can increase the new renewable energy mix. [ABSTRACT FROM AUTHOR]