A electrical motor unbalance a sure thing for power distribution. Especially on the low voltage network side, a higher the load imbalance will be the higher the current arising in the neutral carrier. The current flowing in the neutral conductor will be the loss of electrical power on the network. Therefore, in the distribution of electric power load imbalance must be minimized in order to achieve optimal channeling efficiency. At this research was conducted at the work area of PLN (Persero) district Sibolga, by taking sample 3 substation distribution. Data retrieval is done at two times ie at peak load time and beyond peak load time. From the calculation data obtained shows the magnitude of power losses due to unbalance of the load on the three substations ranging from 0.05% ∼ 4.38%.