Application of three-dimensional hydrodynamics model of Princeton University, Princeton., (1977), POM accommodating diagnostic condition, tides and wind as generating forces has been ulitized to simulate marine current in Bali, Lombok, and Makassar Straits. It has typically been to identify appropriate sites for marine energy extraction and quantify the potential energy available for extraction. In this study, potential current energy in the three straits was estimated for environmental friendly electricity generation by applying Fraenkel equation. Two weeks simulation of horizontally and vertically marine current show that marine current in Bali, Makassar, and Lombok Straits are very strong. Current pattern in Makassar, Bali and Lombok straits show current movement as the same of tide pattern which in return movement. From the results, indicate that the tide current represent the dominant current component have kinetic energy potency for the electric generation. It also indicate that Lombok Strait have current kinetic energy potency larger compared to other straits.