Glossary_of_Terms Updated February 18, 2015

Glossary of Terms Used in NERC Reliability Standards Updated February 18, 2015 Introduction: This Glossary lists each term that was defined for use in one or more of NERC’s continent-wide or Regional Reliability Standards and adopted by the NERC Board of Trustees from February 8, 2005 through February 18, 2015. This reference is divided into two sections, and each section is organized in alphabetical order. The first section identifies all terms that have been adopted by the NERC Board of Trustees for use in continent- wide standards; the second section identifies all terms that have been adopted by the NERC Board of Trustees for use in regional standards. (WECC, NPCC and RF are the only Regions that have definitions approved by the NERC Board of Trustees. If other Regions develop definitions for approved Regional Standards using a NERC-approved standards development process, those definitions will be added to the Regional Definitions section of this glossary.) Most of the terms identified in this glossary were adopted as part of the development of NERC’s initial set of reliability standards, called the “Version 0” standards. Subsequent to the development of Version 0 standards, new definitions have been developed and approved following NERC’s Reliability Standards Development Process, and added to this glossary following board adoption, with the “FERC approved” date added following a final Order approving the definition. Immediately under each term is a link to the archive for the development of that term. Definitions that have been adopted by the NERC Board of Trustees but have not been approved by FERC, or FERC has not approved but has directed be modified, are shaded in blue. Definitions that have been remanded or retired are shaded in orange. Definitions that have been approved by FERC are white. Any comments regarding this glossary should be reported to the following: [email protected] with “Glossary Comment” in the subject line.

Glossary_of_Terms Updated February 18, 2015

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