Distribution Transformer is designed to step the voltage down from a distribution level for use at an industrial, commercial, or residential facility. The type of facility determines the voltage level. The voltage coming into a house however is usually 220v. The high side of the distribution transformer can vary from 13.8 to 69 kv. Distribution transformer numbers in the millions and have the greatest potential for energy savings because of their vast number. They are mounted on distribution poles, outside on a pad, or underground in a vault.