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In 2015, the Government through a special allocation fund has finished constructing an off-grid 15 KWp off-grid solar power plant in Paya Tampah Village, Aceh Tamiang district. Currently, it has been utilized by at least 50 heads of local transmigration families. With the lighting of renewable energy is expected to provide more value to improve peoples living standards and support educational activities in order to continue to run. The construction of this centralized solar power plant is based on the ministerial regulation of energy and mineral resources of the republic of Indonesia, year 2015 no.10, on technical guidance on the use of special allocation funds for rural energy in 2015. The long term reliability of concentrated solar power plants is highly dependent on on-site measurements because of the uncertainty in some of the ever-changing data such as irradiation value, drought rate, which can cause significant power losses and then affect the estimated cost of PV (kWh). With the aim of upgrading capabilities in off-grid solar power plant planning especially in the province of Aceh, this paper will outline in detail the comparison of the results of calculating the performance of off-grid 15 KWp off-grid solar power with system performance measurement results after 2 years of operation. Performance calculations were performed with PVsyst software and software HOME. From the measurement results obtained the total power generated by off-grid solar power plant is 12 kWp and used by 45 households. The cost incurred during installation is USD 300 thousand. From the simulation results with the same technical specifications obtained cheaper cost with the output power of 15 kWp. The results of this study are expected to be used by local governments to be a benchmark on the future planned off-grid solar power plant planning.