ABSTRACT
Distributed utilities (sometimes referred to as DU) is the current term used in describing distributed
generation and storage devices operating separately and in parallel with the utility grid. In most cases,
these devices are small in comparison to traditional utility base or peaking generation, but can range up to
several megawatts. For the purposes of this section, DU will be limited to devices 5 MWand below applied
at either the secondary voltage level, 120 V single phase to 480 V three phase, and at the medium voltage
level, 2.4 kV to 25 kV, although many of the issues discussed would apply to the larger units as well.
