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DG Update: Defining DG

Issue 2 and Volume 107.

The exact definition of what constitutes distributed generation can be a bit elusive, particularly as the industry grows and evolves. Part of the problem involves size of installation. On-site power installations continue to get bigger and more sophisticated. Then there is the matter of grid connection. Time was when the notion of grid-connected DG bordered on the oxymoronic. No longer, especially with the long-awaited adoption of interconnectivity standards including IEEE’s P1547 for systems up to 10 MW.

Power Engineering would like input from readers as to what DG is and how it should be defined. As a starting point, Resource Dynamics Corporation, which publishes DG Monitor, offers its definition in the publication’s November/December, 2002 issue:

“The DG Monitor defines DG as electric generating units less than 20 MW in size that are located close to the primary load being served or provide grid support. Backup power, including emergency and standby power, are included in this definition, as are remote power, which is DG that is used at places located away from the distribution grid.”

E-mail your comments and

suggestions on defining DG to Steve Blankinship, Associate Editor at [email protected]


Transfer Systems Introduced: Gen/Tran, manufacturer of backup power transfer systems for residential and light commercial applications, has introduced a family of pre-wired, transfer systems for backup power applications that can be expanded in the field up to 16 circuits. Designed for generators ranging from 5,000 to 15,000 W, the PowerStay manual transfer switch systems are available in 6, 10 or 12-circuit configurations. Photo courtesy of Gen/Tran Corp.
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