Recently，the energy saving is important problem for electrical facilities. For the management of power consumption in high voltage(HV) consumers，many measurement equipments are need. However，the cost for measurement is very expensive. In order to reduce the measurement costs，the estimation technique of power consumption in branch circuit from the information of the main line is required. From the background，the estimation method for load of transformers from the measurement data at the receiving point in a HV consumer is proposed in this paper. The load of single-phase transformers and three-phase transformers are calculated by the difference of the phase of current and the power factor of loads. In this paper，to confirm the proposed method，the calculation result are shown from the actual measurement data.

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