SUMMARY
The building of Engineering Faculty of Semarang University has potentially to instal a solar photovoltaic (SPV) rooftop. It has emerged as a green energy technology to overcome climate change issues by reducing reliance on conventional fossil fuel energy. The energy produced by SPV can be used to fulfil self consumption of electricity needs, so the fulfilment of electrical energy can be share from PLN network and rooftop SPV. Design of grid connected rooftop SPV needed to optimize and to predict how much power or energy can be produced. The power and energy produced are calculated based on meteorological data for solar irradiation and temperature in 2019 and depend on the dimensions of the building roof area. The results showed that the power and energy requirements of 103.87 KW and 1371.74 KWh with the dimensions of 441 m2. Roof of the building is able to accommodate the number of SPV modules as much as 356 units with a total power and energy amounted to 85.119 Kw and 658.6 KWh. Utilization of grid connected rooftop SPV is able to supply the energy needs of 81.9% of the total electric energy requirements in the building of Faculty of Engineering