Exergy analysis was applied to differents cogeneration Rankine cycles using biomass as fuel, aiming at evaluating the effect of increasing power production (electricity) and its maximization for the same demand of process steam. Moreover, it was studied the effect of different plant configurations units to meet certain need for process steam. To this aim, it will be proposed some modifications in the cycle in comparison with the standar configuration. Therefore, the use of reheating, preheating,