Identification of Unserved Load Area It is expected that the average utilization factor (UF) of transformers serving residential and commercial customers in areas of Hathairat, Ramintra and Suwinthawong roads will have exceeded 70 % by the year 2016. These transformers are located in Ramintra (RT), Minburi (MB) and Khannayao (KNY) substations. Therefore, it is necessary for MEA to have a plan to reduce the UF of these substations. Figs. 8 to 10 show the UF of the distribution substations in the areas of year 2013 and 2016.