IEEE SA STANDARDS ASSOCIATION IEEE Recommended Practice for ISTANDARDS Electric Power Distribution System Analysis IEEE Powerand Energy Society Developed bythe AnalyticMethodsforPowerSystemsCommittee IEEEStd1729TM-2025 (Revision of IEEE Std 1729rm-2014) IEEE IEEEStd1729TM-2025 (Revision of IEEE Std 1729-2014) IEEE Recommended Practice for Electric Power Distribution System Analysis Developed by the AnalyticMethodsforPowerSystemsCommittee of the IEEEPowerand Energy Society Approved19June2025 IEEESAStandardsBoard Abstract: The goal of this recommended practice is to expand the use of IEEE power distribution test feeders into a broader space of software developers, software users, and researchers. The need for new distribution software functionality evolves quickly in areas such as distributed resource modeling, load response to voltage and frequency, reliability improvement, neutral-earth voltage, active controls, interoperability, etc. By leveraging and expanding the set of test feeders, more attention can focus on providing the new functionality.The scope of the recommended practice includes steady-state, event-based, probabilistic, stochastic, and dynamic analysis of electric utility power distribution systems. Industrial and commercial power distribution systems, harmonic analysis, and electromagnetic transient analysis are all excluded. Keywords:IEEE1729TM,powerdistribution, power system analysis The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2025 by The Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 06 October 2025. Printed in the United States of America. IEEE is a registered trademark in the U.S. Patent & Trademark Office, owned by The Institute of Electrical and Electronics Engineers, Incorporated. PDF: ISBN 979-8-8557-2409-7 STD28096 Print: ISBN 979-8-8557-2410-3 STDPD28096 IEEE prohibits discrimination, harassment, and bullying Formore information, visit https:/www.ieee.org/about/corporate/govemance/p9-26.htm! No partofthis publication maybe reproduced in anyform, in anelectronic retrieval system orotherwise,without the prior written permission of the publisher. 2 ImportantNoticesandDisclaimersConcerningIEEEStandardsDocuments IEEE Standards documents are made available for use subject to important notices and legal disclaimers. These notices and disclaimers, or a reference to this page (https://standards.ieee.org/ipr/disclaimers.html). appear in all standards and may be found under the heading “Important Notices and Disclaimers Concerning IEEE Standards Documents.' NoticeandDisclaimerofLiabilityConcerningtheUseofIEEEStandards Documents IEEE Standards documents are developed within IEEE Societies and subcommittees of IEEE Standards Association (IEEE SA) Board of Governors. IEEE develops its standards through an accredited consensus development process, which brings together volunteers representing varied viewpoints and interests to achieve the final product. IEEE standards are documents developed by volunteers with scientific, academic, and industry-based expertise in technical working groups. Volunteers are not necessarily members of IEEE or IEEE SA and participate without compensation from IEEE. While IEEE administers the process and establishes rules to promote fairness in the consensus development process, IEEE does not independently evaluate, test, or verify the accuracy of any of the information or the soundness of any judgments contained in its standards. IEEE makes no warranties or representations concerning its standards, and expressly disclaims all warranties, express or implied, concerning this standard, including but not limited to the warranties of merchantability, fitness for a particular purpose and non-infringement IEEE Standards documents do not guarantee safety, security, health, or environmental protection, or guarantee against interference with or from other devices or networks. In addition, I