South African power utilities are facing frequent power outages in their networks, resulting in unplanned outages. This is often due to cable theft, aging infrastructure, illegal connections, power transformer failures, and many more. The electricity distribution entity of interest has been overwhelmed by a high number of power outages as a result of power transformer breakdowns. In most cases, once power is restored, the impact of these failures is usually not explored. This study will investigate the consequences experienced due to power transformer failures, identify and analyze the factors causing these failures. The study will further mitigate ways to minimize the factors causing power transformer failures. This will improve reliability, network availability, and revenue collections. The study was based in Lenasia, Johannesburg, one of the areas supplied by this entity. The area has a high number of power transformer failures recorded over the years, as compared to other areas. Through the method of elimination, the study found that the most dominating causes of failures are protection malfunction and insulation breakdown. Based on the hypothesis made, an estimated US$9.21 million and US$1.18 million in revenues were lost in 11 and 9 days of outages, where 4500 and 3285 customers were affected, respectively.