This paper analyzes the current status of the process of engineering supervision in construction and infrastructure projects of the construction of transformer stations with connecting cable lines. The paper provides a general description of the project of the type substation and the connecting cable line, as well as the participants in the process of its construction The provisions of legal and by-laws, tools for monitoring the development of the construction process, as well as the key elements and critical points of the process of implementing expert supervision over the construction of a transformer station with a connecting cable line are pointed out. The depiction of the engineering supervision process is based on the extensive literature research and information gathered from experts through real processes in the electrical industry. In this way, precisely described construction control was achieved in accordance with the main project and the quality control and assurance program. The engineering supervision system presented in this paper meets the high standards of quality and safety necessary for the correct execution of the transformer station project with connecting cable lines.