This communal PLTS system is designed to meet the electricity needs of RT 07 RW 05 Tambakreja, Cilacap Selatan, Cilacap. The design of this communal PLTS system uses a general design based on solar irradiation data and load requirements. Electrical energy needs for public facilities and social facilities. The result of calculations and analysis carried out, design of the communal PLTS system is designed to meet the electricity need of public facility and social facility. Communal PLTS with a capacity of 21,6 kWp that is capable of demand electrical energy requirements of 54 kWh/day. Design of this communal PLTS system uses a 200 Wp solar panel with 108 solae panels and 96 batteries with a capacity of 1000 Ah. The investment cost needed for design of communal PLTS Rp 1.679.125.016, the operational and maintenance costs are Rp 82.5000.000. When using communal PLTS electricity requires a fee Rp 16.631.354/month, whereas when using PLN electricity it only cost Rp 2.376.993/month. By using communal PLTS, it can reduce the potential of carbon dioxide emmisions by 14,2 ton 𝐶02 per years.