E. Interconnection Procedures and Technical Requirements Should Reference Recent Standards

Interconnection procedures often include references to codes and standards. To ensure the efficient interconnection of ESS, regulators should update interconnection procedures and technical requirements to include references to the most recent version of the standards discussed above. SGIP lists codes and standards in Attachment 3, while other procedures include references in other places.

1. Recommendation

Interconnection procedures should use the most recent versions of the standards discussed in this section. Updates to the procedures should account for timelines for adopting new or revised standards established by regulatory proceedings. SGIP Attachment 3, like many state interconnection procedures, lists some standards including the revision year and some without the revision year. Listing the revision year is the best practice because it informs stakeholders when the new version of the standard applies. Any dated standards should be updated to the most recent revision year and title. The following are references to the standards found in this section:

IEEE 1547-2018 IEEE Standard for InterconnectingInterconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, as amended by IEEE 1547a-2020 (Including use of IEEE 1547.1-2020 testing protocols to establish conformity)

UL 1741, Edition 3 September 28, 2021 Inverters, Converters, and Controllers and Interconnection System Equipment for Use In Independent Power Systems With Distributed Energy Resources

IEEE C62.92.6-2017 IEEE Guide for Application of Neutral Grounding in Electrical Utility Systems, Part VI – Systems Supplied by Current-Regulated Sources