Basically, the basic needs of human beings in this world are vary. In the past few years, the electricity needs of human beings in every year are increasing so that for the digital era like today, electrical energy also become one of the basic needs of mankind. In increasing the need of electrical energy, the load that is supplied by transformer will continue to increase, and it will affect the ability of 150 kV Gejayan transformer in supplying the load. Analysed using multiple linear regression methods, transformer 1 can only supply the optimal load for 4 years only from 2014 to 2018, and transformer 1 supplies load with heavy load condition with percentage Over 80% to 2033. While Transformer 2 is able to supply optimal load longer, which is for 14 years from year 2014 to 2028. The rest until the year 2033 already experienced a heavy load condition where the loading percentage has exceeded the number of 80%.