3. Optimal design of HRES

This section describes an optimum HRES for Deokjeokdo island based on lowest net present cost (NPC) and levelized cost of energy (LCOE) using HOMER pro software model. Hybrid optimization model for electric renewables (HOMER) pro software can efficiently model and optimize renewable energy plans for a specific region. The optimum HRES must fulfill hourly and annual electricity demand of the island, which corresponds to approximately 7.296 MWh/year without any external assistance such as grid, etc.

#### 3.1 Input data for HOMER pro

Before starting energy simulations in HOMER pro, one must define pre requisites such as electric load, equipment such as wind turbines, PV panels and other essential details like interest rate and project life.
