Telecom services have advanced from times to time and now, nothing seems possible without telecom services. Satisfying the ever increasing customer demand is challenging and hard to fulfill the need. Ethiotelecom is the only telecom operator in Ethiopia and responsible to deliver all type of telecom services nationwide. Accordingly, Ethiotelecom has launched Telecom Expansion Program to deploy state of the art technology and to expand existing infrastructure at large. The program encompasses different technical domain projects and executed using turnkey project approach. The purpose of this study is to explore the role of Turnkey procurement system on project performance of telecom expansion program of Ethiotelecom from schedule, budget and quality perspective. According to the result of this study, lack of exhaustive project planning, execution, and internal and External factors has triggered project schedule delay and budget variation significantly. The main findings reveal that there is a relationship between turnkey procurement system and project performance. The target population for the study was taken all the 49 Telecom Expansion Program participants who were involved in the program. The study was a descriptive research type and used questionnaires and interviews to collect the required data. The data were analyzed using Statistical Package for Social Sciences (SPSS) version 26. The findings of the study are of great importance for future projects in the company and fill the gap of empirical evidence in Ethiotelecom. The study suggested that: before project commenced detail and exhaustive planning should be done and factors that affect project performance should be scrutinized. The study recommends that further research should be carried out to establish the role of turnkey procurement system on other project performance indicators such as stakeholder satisfaction, Knowledge transfer and Return on Investment (ROI)