Renewable energy generation has become the choice of many countries, including Indonesia. New and Renewable Energy in Indonesia is a Solar Power Plant . Not only targeting people who are not reached by alternative distribution networks, but the system is a need for public and communal facilities in Indonesia. Gorontalo City is part of Gorontalo Province as a province that has an area that occupies part of the northern part of Sulawesi Island with various regional characteristics, ranging from coastal areas to mountainous areas, where several areas in this province have an attraction for investors to invest their capital. in the industrial and commercial sectors. commercial. Besides that, The uneven distribution of energy infrastructure is an energy problem faced by Gorontalo City. The research and modeling method in this study uses the Photovoltaic System Software (Pvsyst) application by conducting a survey of the research location planning the installation of a Rooftop Solar Power Plant to determine the condition of the building, the geographical location of the research location. From the simulation results using the PVsyst Ichsan Gorontalo University Building using a stand alone system with a PV array of 1261 units with a total Pnom of 328 kWp, for battery technology, namely lithium-ion, 925 LCO units produce a voltage of 241 V with a current capacity of 9990 Ah. Produces energy per year of 513619 kWh/year with a ratio of 70.36% where the active load is 13 hours/day. The research and modeling method in this study uses the Photovoltaic System Software (Pvsyst) application by conducting a survey of the research location planning the installation of a Rooftop Solar Power Plant to determine the condition of the building, the geographical location of the research location. From the simulation results using the PVsyst Ichsan Gorontalo University Building using a stand alone system with a PV array of 1261 units with a total Pnom of 328 kWp, for battery technology, namely lithiumion, 925 LCO units produce a voltage of 241 V with a current capacity per year of 513619 kWh/year with a ratio of 70.36% where the active load is 13 hours/day. The research and modeling method in this study uses the Photovoltaic System Software (Pvsyst) application by conducting a survey of the research location planning the installation of a Rooftop Solar Power Plant to determine the condition of the building, the geographical location of the research location. From the simulation results using the PVsyst Ichsan Gorontalo University Building using a stand alone system with a PV array of 1261 units with a total Pnom of 328 kWp, for battery technology, namely lithium-ion, 925 LCO units produce a voltage of 241 V with a current capacity of 9990 Ah. Produces energy per year of 513619 kWh/year with a ratio of 70.36% where the active load is 13 hours/day.