Power Transformer Manufacturing facilities have transformers to step electrical power down to a level that can be used within the building. They are expensive to repair or replace and are subject to breakdown due to power surges, short circuits and aging insulation. The failure rate of transformers in the United States is expected to rise in the coming years as units installed years ago reach the end of their useful lives. © 2004 The Hartford Steam Boiler Insurance and Inspection Company.     All rights reserved.