A tri-generation system 10 comprises a heat generation system, a first rankine cycle system 12 , a second rankine cycle system 14, a cascaded heat exchange unit 24, at least one first heat exchanger 20 coupled to the second rankine cycle system for heating a third fluid, at least one second heat exchanger 24 disposed at one or more locations in the first rankine cycle system for heating a fourth fluid, and an absorption chiller coupled to the at least one first heat exchanger and the at least one second heat exchanger for receiving the heated third fluid and the heated fourth fluid. The first rankine cycle system 12 is coupled to a first heat source and configured to circulate a first working fluid to remove heat from the first heat source. The second rankine cycle system 14 is coupled to at least one second heat source and configured to circulate a second working fluid to remove heat from the at least one second heat source. The first and second working fluids are circulated in heat exchange relationship through the cascaded heat exchange unit 24 for condensation of the first working fluid in the first rankine cycle system and evaporation of the second working fluid in the second rankine cycle system 14.
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