Ice storms and related ice loads on overhead lines could result severe in the power system, if this transmission line is associated to a power plant or urban functioning, specially, if there are not a high voltage ring for reliability. The objective of this research is to propose a new methodology for estimate ice loads due to Andean mountain over 4500 masl, based on international standards, meteorological observational data, national and the best practices for power system construction. The decision about an overhaul or replacement of transmission line systems come with a long-term commitment, "this is particularly important considering that many researchers predict more intense and more frequent climatic hazard in the future".