## 5 Conclusions  
This research aims to examine and evaluate a newly developed hybrid system that merges a Kirkuk Brayton Cycle (BC) with both a steam Rankine cycle (RC) and an Organic Rankine Cycle (ORC). The energy for the proposed hybrid system is generated through natural gas and solar parabolic trough collectors (PTCs). The novel design combines the  
Figure 8: HPST inlet pressure P\({}_{1}\)’s effects on system performance, environment, and cost. Figure 9: The impact of the condenser temperature on the developed system’s performance, environment, and cost. benefits of fossil fuels and renewable energy, overcoming their respective limitations to achieve improved economic and environmental efficiency. The power plant in Kirkuk, a city in the northern region of Iraq, benefits significantly from the substantial solar radiation potential. As a result, it is an ideal location for the installation of this hybrid system. The current facility experiences a significant increase in power generation when solar energy is integrated with natural gas, and the excess heat from the gas turbine is efficiently utilized. The environmental effect assessment is an inclusive study that inspects CO\({}_{2}\) emissions and carbon footprint levels. It focuses on the system's capability to decrease greenhouse gas emissions effectively. According to the findings, it can be determined that the hybrid system suggested in this study can augment electricity generation while also remaining environmentally economical and environmentally friendly. The conclusions offer valued recommendations that can suggestively increase the efficiency and functionality of hybrid power manufacturing systems, particularly in regions with ecological conditions comparable to Kirkuk's. The results of this study propose that integrating solar PTC systems with natural gas might present a capable method that supports the efficiency improvement and environmental sustainability of power production, contributing to the overall development of ecological energy solutions. The results demonstrate notable improvements in both energy and exergy efficiency. With a thermal efficiency \(\eta_{\text{th}}\) of 59.32% and an \(\eta_{\text{Ex}}\) of 57.28%, the proposed system shows significant advancements over conventional power-generation methods. The exergoeconomic analysis offers valuable insights, revealing the lowest energy cost of 71.93 USD/MWh /MWh when the compressor pressure ratio is optimized at 8 bar. This underscores the importance of optimizing this parameter to minimize costs. Additionally, the environmental study indicates that increasing the compressor pressure ratio significantly reduces CO\({}_{2}\) emissions, lowering the carbon footprint to 316.3 kg CO\({}_{2}\)/MWh. Overall, the hybrid system enhances electricity production while operating efficiently, cost-effectively, and sustainably. This study found that increasing the compressor pressure ratio improved both thermal and exergy efficiencies, with an optimal energy cost achieved at 8 bar. Raising the gas turbine inlet temperature (GTIT) from 1100 K to 1600 K significantly boosted the net power output, peaking at 339.7 MW, while maintaining stable CO\({}_{2}\) emissions. Similarly, increasing the HPST inlet pressure from 60 bar to 150 bar enhanced the thermal efficiency to 61.63% and exergy efficiency to 59.51% while also reducing energy costs and emissions. Higher HPST inlet temperatures, particularly at 813 K, further improved system performance by lowering energy costs and minimizing the carbon footprint. Conceptualization, A.A. ([PERSON]); Methodology, E.D. ; Software, A.A. ([PERSON]) and A.A. ([PERSON]); Validation, A.A. ([PERSON]); Formal analysis, A.A. ([PERSON]); Investigation, A.A. ([PERSON]), A.A. ([PERSON]), and E.D. ; Writing--original draft, A.A. ([PERSON]), A.A. ([PERSON]), and E.D. ; Writing--review and editing, A.A. ([PERSON]). All authors have read and agreed to the published version of the manuscript. This research received no external funding. This research received no external funding.