The paper presents the minimization concept of the capital costs of the power line design by optimizing the main parameters of a transmission line as well as possibility of use of new advanced technologies such as High Temperature Low Sag conductors and monitoring systems. The evaluation process of a concept is presented in three stages and takes into account the impact of the important factors such as thermal, mechanical and environmental limitations. The main interest in this paper is focused on the detection of a problem of an electrical field, which may not satisfy to the required level, thus being as a problem in the transmission network “bottlenecks”. Moreover the proposed practical method hands an efficient solution of the presenting problem allowing the customer to choose the best alternative of a power line design. The obtained results are analyzed and discussed in a paper.