Traditional energy generation methods is causing ton of side effect to the natural environment and indirectly endanger living species including human. Dependences of unrenewable resources for energy production need to be reduce step by step. This paper focus on estimate the potential of energy generated at Belawai river. Field study on the river, understanding on the natural condition of river and turbine blade consideration are done to undergo estimation. The result is positive on the capability of Belawai river where each month of year 2014 is estimated capable producing more that 12000 kW