## 1 Introduction
[PERSON] and other authors noted that the new system would feature an increased methane conversion factor. In the new system, electricity production increased by 55.52 kW (corresponding to 6.2%) and cooling increased by 542.49 kW (corresponding to 101.49%). The analysis revealed that the exergy efficiency of the system increased by 8.31%. The study indicated that an excessive inlet temperature of the gas to the turbine was unfavorable for exergy efficiency from the perspective of the whole system. [PERSON] and other authors [23] analyzed a co-generation system modeled in the EES software (Aspen Plus), consisting of a gas turbine, absorption chiller, boiler, and heat exchanger. The system was studied under nine characteristic scenarios and the results were presented and compared in terms of energy efficiency, energy consumption, fuel consumption ratio, and CO\({}_{2}\) production. The optimal solution for combined electricity and cooling production was found in Scenario 5 (two absorption chillers installed in series, i.e., Stages I and II), with a fuel consumption ratio of 45,325.5 kJ/kg. For the combined production of electricity and heat, Scenario 7 was the most beneficial (with a fuel consumption ratio of 39,541.9 kJ/kg), where all heat could be recovered. That article also noted that the highest CO\({}_{2}\) production (88.18 kg/s) was observed in the devices presented in Scenarios 1 and 6, which were found to be insufficient and inefficient. On the basis of the conducted studies, it was concluded that for combined heat and electricity production, reducing the pressure in the heat recovery system of the gas turbine led to a decrease in the output temperature from the heat exchanger, significantly affecting the fuel consumption ratio. [PERSON] et al. studied the energy efficiency of a single-stage absorption chiller with variable parameters in terms of boiler power supply and absorber cooling [24]. They showed that the decreasing absorption temperature increased the device's energy efficiency, i.e., the possibility of cooling the absorber to 30 \({}^{\circ}\)C allowed for the maximization of the EER (0.77) when the boiler's supply temperature was lowered to 82 \({}^{\circ}\)C. Similar research results were obtained by [PERSON] et al. [25], [PERSON] [26], and [PERSON] and [PERSON] [27]. A literature survey revealed that there is limited interest in the application of such solutions in industrial plants. This is partly due to a lack of knowledge among industry energy managers concerning the availability of absorption cooling technologies. New approaches to the evaluation of industrial plants based on the Environmental-Social-Governance (ESG) model require a broader look at existing, technically acceptable solutions which could help to reduce energy consumption and the environmental footprint of industry. Despite relatively low EERs and SEERs, absorption chillers used in synergy with combined heat and power sources--i.e., tri-generation systems--may be attractive solutions in terms of energy usage (primary energy) and environmental sustainability (CO\({}_{2}\) emissions) in comparison to traditional compressor systems powered by electricity. Here, we present an energy and environmental analysis of implementing the dual-stage absorption chillers supplied from an existing gas-fueled co-generation plant at a selected pharmaceutical plant. It is proposed that such an action may lead to the reduction of primary energy consumption and carbon dioxide emissions.