In industrial field, the gas turbines has been extensively used in combined power plant cycles that depicts low efficiency. These power plants are developed of steam and gas turbines. The gas turbine power plants are lighter and smaller that the steam power plants where the cost of every unit is less and the time required for delivering the gas turbine is comparatively shorter. This review discuss on various refrigerant fluids for increasing the efficiency or output of the power plants associated with trans-critical carbon di oxide, gas turbine and ammonia water solution. Energy conservation is prominent globally irrespective of non-renewable or renewable types. The refrigerants needs to be optimized in ventilation, heating, air conditioning to overcome several hazardous effects due to ozone depletion impact and greenhouse effect. Among those the carbon di oxide refrigeration cycle are primary and hence crucial importance has to be provided to this scenario. This review also discussed the various modified technologies with prominent performance and features. Accordingly potential future developments are also summarized in this review.