At present electricity is a primary need that must be used, because it will trigger the economic development of a region and country. In a distribution of electric power, the transformer is one of the most important assets because it can change the voltage level until it can be distributed, it is also the most expensive asset of all equipment in the substation. The expensive investment cost of a transformer causes the priority to be replaced according to the level of urgency, so that the costs to be incurred are proportional to the returns obtained. By knowing the condition of the transformer early can prevent the occurrence of interference that can cause power outages or black out. KEPDIR 149 concerning the replacement of the Main Transmission Equipment and in this case the transformer contains the criteria used to make the replacement for PLN. These criteria will be used to prioritize what transformers will be replaced, it is technical criteria, operating age, and level of risk by using AHP method. The results of the research it was found that technical conditions have the greatest influence because they have a weight of 0.4, and 0,3 for each age and risk level criteria based on the interview of top management. Whereas for the power transformer No. 2 is the transformer with the highest priority, with DGA condition is T3, 23 years operation and high level of risk.