The application of the Aluminum Conductor Composite Core (ACCC) is an important issue, which leads to one of the possible methods to increase the limited power flow of the existing overhead lines as well as to prevent the overheating of power lines. This method is more suitable for an uprating solution of power systems, because the ACCC conductors have advantages like high current capacity, long-term reliability, low sag-tension property, easy and quick installation, and low line loss. The paper concerns a comparative assessment of the ACCC and Steel–Reinforced Aluminum Conductor (ACSR), which is based on the technical and commercial advantages of the examined conductors. For the purposes of the comparison, the reconstruction of the existing 110 kV transmission network loop in Western part of Latvia, called the “Kurzeme Ring” was chosen. The point of new transmission line design is increasing the transmission capacity and voltage level to 330 kV and power supply reliability. The selected area is interesting in that it is located in the Baltic Sea near the coast, where there are different combinations of the weather conditions, for example, high wind pressures, icing and frosting of conductors and wire ropes. Based on the chosen particular transmission line route, the comparative estimation was made. The comparison includes both the technical aspects – the mechanical and heating limitations, as well as the economical aspects. The main aim in the comparison was to determine the optimum variant of the examined conductors for the calculation of the selected criteria. The obtained results of the evaluation are presented in the paper in tables and graphic form. As a result, the most economically valuable variant is using conductor with a composite core “Paris–840”, if the other conditions remain the same, except the permissible conductor temperature.