I In analyzing the performance of the smart solar dryer dome (SSDD) system,one can explore the maintained temperature and humidity values. For the dryingprocess for coffee commodities, the target temperature value is 40°C with ahumidity target value of less than 60%. A reliable electrical power distributionsystem with a combination of energy sources is needed to maintain theperformance of SSDD system components. From the evaluation of loadrequirements and research locations for the SSDD system, an energy sourcecombination analysis was carried out, namely between the existing PV/Batterysystem and the PLN/PV/Battery energy combination system. In a combinedenergy system gas is a distribution of reserve energy sources in the SSDDsystem. Analysis of electric power distribution with a combination of energysources between PV/Battery and PV/PLN/Battery is explained in the loadprofile graph, while the LPG energy source is in the system\\\'s operationalscenario. Then, a review was carried out using a literature study, data collection,and system modeling. From the results of optimization modeling of the Homerdevice on a combined energy source system, it was obtained that the capital costefficiency of the system was IDR 102,960,955.09, the LCOE value was IDR827,31.00, and the operational cost value was IDR 1,220,000.00. The systemcapital cost efficiency percentage is 53%, the levelized COE percentage reaches62%, and the operational cost percentage reaches 65% compared to the existingsystem. The combined energy system using LPG gas can maintain the reliabilityof the drying process when the rainy season conditions are relatively high andregional power outages occur simultaneously. The SSDD system can bemaintained in terms of reliability and agricultural productivity.