What Is IEEE 1547?
IEEE 1547, "Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces," is the foundational US standard governing how distributed energy resources (DERs) — solar PV, battery storage, fuel cells, wind, combined heat and power — connect to the utility grid. First published in 2003 and substantially revised in 2018 (IEEE 1547-2018), it defines the technical requirements that inverters and DER controllers must meet to operate safely and reliably on the grid.