Ocean wave energy (OWE) is one of many promising renewable energy sources with a high energy density. By using the average wave energy data of 21-year WAVEWATCH-III (WW3) model, some areas were discovered to have a great potential for the wave energy generation. This present study was evaluating the selected Wave Energy Converters (WEC) and determining their capability to do the energy capture in the potential site of the Indonesian seas. The data of WW3 indicate the energy flux of OWE in Indonesia reached to 74.65 kW/m. The case study was conducted in the present research placed in an area of the Java Island called Cidaun, with energy flux about 42.41 kW/m. One of the Heaving Device type was used for assessing the practical energy and to analyze its development in Indonesia with certain limitations; a single round float and diameter device about two meters. The annual energy extracted from the designated WEC was approximately reached 119 GWh. Furthermore, the levelized cost of energy (LCOE) was assessed for the particular device in the selected site, resulted about 25.13 $cent/kWh or four times higher than a standard of minimum feed in tariff given by the Indonesian government.