Electricity demand is increasing every year along with economic growth and population in Indonesia. Meanwhile, non-renewable fossil fuels are still the main source of electricity generation in Indonesia. Therefore, the development of an affordable and environ-mentally friendly renewable energy-based power plant is very necessary. Ocean thermal energy sources available in abundance and has great potential in meeting national energy needs. In this study, a design concept of the 50 MW Ocean Thermal Energy Conversion (OTEC) facility was developed for Banten Province. Capital costs and expenditures for OTEC facilities were identified based on location requirements. The cost analysis is then combined with the OTEC facility investment scheme to obtain the Levelized Cost of Energy (LCOE).