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Palm oil plant is one of principal-national-plant commodities in Indonesia and becomes the highest worldwide Crude Palm Oil (CPO) production used as an edible necessities and source of biofuel (Biodiesel). The whole process of Fresh Fruit Bunch (FFB) at palm oil plant (called PKS) Cikasungka could produced Palm Oil Mill Effluent (POME) having high Chemical Oxygen Demand (COD) content amount 35.000 ppm. POME could be used to generate Hydrogen (called Biohydrogen) and Methane (called Biomethane) by throughing two steps fermentation process for producing Biohydrogen and Biomethane gases respectively on 0,6 m3 POME into 1 m3 prototype biohythane system which have been mixed with starter liquid containing consortium microbe. The first fermentor could produce biohydrogen by 32% wt of the total generated gas for 1 x 24 hours of the fermentation process. The increase of biohydrogen after purification process until 99% wt gave potencial electricity generation from biohydrogen amount 0,0188 kWe. The second fermentor could produce biomethane by 60% wt of the total generated gas more than 1 x 24 hours afterwards of fermentation process. The purification of biomethane until 99% wt gave generated potencial electricity amount 0,753 kWe. Furthermore, economic calculation analysis on biohythane prototype showed up the value of Capital Expenditures (CAPEX) amount US$ 26,395 and Operational Expenditures (OPEX) amount US$ 14,712/year too. By totaling the potencial generated electricity from both fermentors, these resulted generated electrical cost was 2.478 US$/kWh. [ABSTRACT FROM AUTHOR]