Indonesia has decided to move its capital from Jakarta to IKN in East Kalimantan. In line with the decision, currently, Indonesia has also committed to increasing the use of green energy and reducing carbon emissions, development of renewable energy infrastructure in IKN is the subject of current priority. With the knowledge of the best hybrid system to be applied to IKN, this research is expected to address the intermittent problem that exists on Renewable energy Power Plant. The criteria to be used in decision-making analysis (MCDM) are technical and economical, the overall criteria are used to obtain the best HRES configuration design. IKN Potensial Renewable energy Resources will be simulated and optimized using HOMER software for subsequent analysis using the decision-making algorithm AHP-TOPSIS method, MCDM analysis will be obtained the best HRES configuration rating. The Outcome of this study is to get the Best Hybrid Renewable Energy System (HRES) Configuration that has reliability to support the sustainability of electricity supply on the IKN. This indicates that extensive investment in PV/Natural Gas/Diesel/ Battery system has a reasonable potential to achieve electricity load demand at IKN-Nusantara. This research are expected to be a reference to relevant authorities in decision-making on the use of new renewable energy systems on IKN.