Renewable energy in Indonesia is numerous, abundant, and diverse. Almost every region in Indonesia has renewable energy sources that can be utilized to become renewable power plants, which are industrial or large-scale, small-scale, or only for regional use. Itself. PLTS is a power plant with many opportunities that can be developed in Indonesia. Based on the results of the analysis that has been carried out, several conclusions can be drawn about designing a rooftop solar power plant using the HelioScope software. The results show estimated energy production obtained through simulations using HelioScope for one year is 882,398 kWh, with the highest production occurring in May at 8,554.6 kWh and the lowest production in November at 6,120.3 kWh. HelioScope application, besides being able to display the irradiation results and production results of the designed or simulated PLTS, HelioScope also shows that there are power losses that affect PLTS production, which is caused by the temperature of the solar cell module of 6.7%. At the same time, other power losses and the most negligible effect are caused by the conductor of 0.3%. The HelioScope application makes it easy to determine the initial design for installing solar panels for a house or building and where we want or are going.