The key techniques employed in this paper reflect on a comprehensive method for calculating the cost of the electric power and energy needed to supply the life-cycle losses of power transformers. The method is applicable to transformer users who possess their own generation and transmission facilities. The proposed loss evaluation method is based on factors derived from relevant historical and forecasted data that are combined to determine the total ownership cost of power transformers. Finally, in a companion paper, the method is evaluated on a small-scale real system. Index Terms-Demand component of losses, energy component of losses, power transformers, system and cost parameters.

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This paper defines a probabilistic, life-cycle loss evaluation method to evaluate the total ownership cost of power transformers that are obliged to exclusively serve large wind plants. The method that is introduced responds to the ongoing efforts of developing risk and cost-based decision-making processes in today's competitive and dynamic energy markets. Therefore, capitalizing the losses and, consequently, the ownership cost of transformers, serving intermittent wind energy sources, entails a probabilistic approach that integrates the financial and technical characteristics as well as the uncertainties of wind energy generation.Index Terms-Life-cycle loss evaluation, power transformers, probabilistic total ownership cost, wind energy.

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