Power company transformers, mainly distribution and substation units, step voltage down from higher distribution levels (e.g., 11-33 kV) to residential and commercial service voltages. They provide isolation and help limit fault currents. By adapting voltage to end-user needs, they enable efficient bulk transmission at higher voltages while ensuring safe delivery locally. They also play a role in voltage regulation and power quality, often integrating with capacitor banks and feeder automation for modern smart grid operations.