Western Electricity Coordinating Council WECC Glossary of Terms and Naming Conventions Updated: December 6, 2016

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1 Table of Contents Western Electricity Coordinating Council WECC Glossary of Terms and Naming Conventions Updated: December 6, 2016 Overview/Glossary Characteristics... 2 Terms Developed Using the WECC Reliability Standards Development Procedures... 4 Attachment: WECC Document Numbering Convention... 9 Standards Numbering... 9 Document Type Designations... 9 Errata with an Interpretation Interpretations Numbering Renaming WECC Regional Business Practices to WECC Criteria Categories/Abbreviations Used in NERC Standard Numbering Convention... 11

2 WECC Glossary Page 2 of 12 Overview/Glossary Characteristics The WECC Glossary of Terms and Naming Conventions (WECC Glossary) consists of terms that were developed using the WECC Reliability Standards Development Procedures (Procedures), or its successor. This glossary shall be used as the single-source repository for all defined terms developed using the Procedures. 1 The WECC Glossary shall not duplicate a defined term maintained by either the North American Electric Reliability Corporation (NERC) or the North American Energy Standards Board (NAESB). 2 Purpose Per the WECC Standards Committee (WSC) Charter, the WSC is responsible for performing an annual review of the WECC Glossary to ensure the document remains current. The following steps describe the process for adding, modifying, deleting, and administering the defined terms located in the WECC Glossary. Adding Terms The process for adding terms to the WECC Glossary is described in the Procedures. Modifying Terms The process for modifying an existing WECC Glossary term shall be initiated by filing a WECC Standards Authorization Request (SAR) and developed using the steps established in the Procedures. Upon final disposition, the WSC shall ensure the final term is included in the WECC Glossary. Deleting Terms When there is no longer a document (developed under the Procedures) with an active Effective Date in which a specific defined term is used, that term shall be deleted from the WECC Glossary. Administration During development, modification, or consideration for deletion of a defined term, the term shall be retained in the document under development. 1 This document has been developed from a Version Zero source and contains some defined terms that were not developed using the Procedures. 2 In the event NERC adopts an existing term from the WECC Glossary for inclusion in the NERC Glossary of Terms Used in Reliability Standards, a WECC SAR should be filed to review use of the term in affected documents.

3 WECC Glossary Page 3 of 12 Upon final disposition, the WSC shall ensure the final term is removed from the body of the document under development and moved into the WECC Glossary. The updated WECC Glossary shall be posted as soon after final disposition as is practical. The previous version of the WECC Glossary shall be archived. Defined terms developed for WECC Regional Reliability Standards will be handled in accordance with NERC s instructions. Annual Review The WSC shall ensure that the WECC Glossary is reviewed annually for accuracy. Contact The WECC Glossary is maintained by the WSC. If you have questions regarding the WECC Glossary, contact W. Shannon Black at (503)

4 WECC Glossary 4 Terms Developed Using the WECC Reliability Standards Development Procedures Term WECC Board Approval Approved Definition Term Origin Capacity Associated with Energy Recallable for Reserves December 6, 2007 C-RE: Capacity Associated with Energy Recallable for Reserves. This product is energy which is recallable within ten minutes of activation of reserves and has been included in the Source Balancing Authority s reserve resources. C-NS: Capacity for Non-Spinning Reserve. Capacity for Non Spinning Reserve December 6, 2007 On-Demand Non-Spinning Reserve obligation/resource is a Non-Spinning Reserve product that can be activated through the adjustment of a capacity e- Tag. C-SP: Capacity for Spinning Reserve. Capacity for Spinning Reserve December 6, 2007 On-Demand Spinning Reserve obligation/resource is a Spinning Reserve product that can be activated through the adjustment of a capacity e-tag. G-EX: Exchange of Firm Energy. Exchange of Firm Energy December 6, 2007 An exchange of firm energy where by one entity delivers energy to another entity at one point on the grid and receives an agreed upon amount of energy from that entity at another point on the grid. Firm Contingent December 6, 2007 G-FC: Firm Contingent. The energy is from a designated generating unit or source. This product may be interrupted only to the extent the output capability of the designated unit or source has been reduced due to a deration or outage of the designated unit or source. A G-FC product cannot be interrupted for economic reasons.

5 WECC Glossary Page 5 of 12 Term WECC Board Approval Firm Energy December 6, 2007 Firm Provisional Energy Hourly Firm Energy Interchange Authority (IA) Emergency December 6, 2007 December 6, 2007 July 29, 2010 G-F: Firm Energy. Approved Definition This product may be curtailed only in the event of a reliability condition or to meet Seller s public utility or statutory obligations for reliability of service to native load. A G-F product cannot be interrupted for economic reasons. G-FP: Firm Provisional Energy. This product may be interrupted only if the interruption is within the recall time and for conditions allowed by applicable provisions governing interruption of service, as mutually agreed to by the parties. A G-FP product cannot be interrupted for economic reasons. G-F1: Hourly Firm Energy. This product may be interrupted, consistent with the provisions of the transaction, provided the Purchasing- Selling Entity or Load-Serving Entity receives notification of the interruption 40 minutes or more prior to the start of the operating hour. A G-F1 product cannot be interrupted for economic reasons. A failure of the Interchange Authority software system that prevents the distribution of e-tags to Reliability Coordinators, Balancing Authorities, Transmission Service Providers, Purchasing-Selling Entities, Load-Serving Entities and Interchange Authorities for assessment of confirmed interchange transactions, for distribution of confirmed interchanged transactions, or both. Term Origin INT-020-WECC-CRT This term is proposed for retirement under WECC The project was approved for ballot by the WSC on December 6, 2016.

6 WECC Glossary Page 6 of 12 Term Interchange Authority Software Provider Local Area Protection Scheme (LAPS) WECC Board Approval July 29, 2010 June 22, 2011 Non-Firm Energy December 6, 2007 Primary Reference Source (PRS) June 22, 2011 Safety Net June 22, 2011 Approved Definition The Help Desk of the Software Vendor who is supporting the Interchange Authority Software System (WECC Interchange Tool). Contact information will be provided on the homepage of the WECC Interchange Tool. A Remedial Action Scheme (RAS) whose failure to operate would not result in any of the following: Violations of TPL-(001 thru 004)- WECC-1- CRT System Performance Criteria, Maximum load loss 300 MW, Maximum generation loss 1000 MW. G-NF: Non-firm Energy. This product may be interrupted for any reason or no reason, without liability on the part of either the buyer or seller. Primary Reference Source equipment provides a timing signal whose long-term accuracy is maintained at 1x10-11 or better with verification to universal time coordinated (UTC). A PRS signal is used as the basis of reference for control of other clocks within a telecommunications network. A type of Remedial Action Scheme designed to remediate TPL (System Performance Following Extreme Events Resulting in the Loss of Two or More Bulk Electric System Elements (Category D)), or other extreme events. Term Origin INT-020-WECC-CRT PRC-(012 through 014)- CRT COM-001-WECC-CRT-1 PRC-012 through 014- WECC-CRT This term is proposed for retirement under WECC The project was approved for ballot by the WSC on December 6, This term is proposed for retirement under WECC-0119B. The project was approved for ballot by the WSC on December 6, This term is proposed for retirement under WECC-0119B. The project was approved for ballot by the WSC on December 6, 2016.

7 WECC Glossary Page 7 of 12 Term WECC Board Approval Approved Definition Term Origin WECC Underfrequency Load Shedding Review Group (Review Group) December 6, 2012 A joint regional group comprised of WECC Balancing Authorities, Planning Coordinators, Transmission Operators, and Transmission Planners created by the WECC Joint Guidance Committee to review and maintain an accurate underfrequency load shedding database and simulation models reflecting the WECC Off-Nominal Frequency Load Shedding Plan. The Review Group shall also be responsible for conducting simulations of the Coordinated Plan to ensure the Coordinated Plan meets all the requirements of NERC Reliability Standard PRC PRC-006-WECC-CRT WECC Remedial Action Scheme Database: November 30, 2011 That database of information collected from the WECC Remedial Action Scheme Information required under PRC-012-(012 through 014)-WECC-CRT-2.1, WECC Remedial Action Scheme Information Sheet (Attachment A). PRC-(012 through 014)- WECC-CRT Western Electricity Coordinating Council Off- Nominal Frequency Load Shedding Plan (Coordinated Plan) December 6, 2012 The Coordinated Plan presented as Attachment A to PRC-006-WECC-CRT-1, or its successor, as required by NERC Reliability Standard PRC and adopted by all Planning Coordinators within WECC. PRC-006-WECC-CRT This term is proposed for retirement under WECC-0119C. The project was approved by a WECC Ballot Pool. On December 6, 2016, the WSC approved forwarding the project to the WECC Board of Directors with a request for approval. 8 This term is proposed for retirement under WECC-0119B. The project was approved for ballot by the WSC on December 6, This term is proposed for retirement under WECC-0119C. The project was approved by a WECC Ballot Pool. On December 6, 2016, the WSC approved forwarding the project to the WECC Board of Directors with a request for approval.

8 WECC Glossary Page 8 of 12 Term WECC Board Approval Approved Definition Term Origin Wide Area Protection Scheme (WAPS) November 30, 2011 A Remedial Action Scheme (RAS) whose failure to operate would result in any of the following: Violations of TPL-(001 thru 004)- WECC-1- CRT System Performance Criteria, Maximum load loss 300 MW, Maximum generation loss 1000 PRC-(012 through 014)- WECC-CRT-2.1, Attachment A This term is proposed for retirement under WECC-0119B. The project was approved for ballot by the WSC on December 6, 2016.

9 WECC Glossary 9 Attachment: WECC Document Numbering Convention As WECC creates new documents they will be numbered in accordance with the following numbering convention unless otherwise required by NERC or another regulatory body. 11 WECC Standards staff will assign the numbers on behalf of the drafting teams. Standards Numbering WECC-originated Regional Reliability Standards (RRS) will be numbered in accordance with the NERC Standards Numbering System or its successor. For example: BAL-002-WECC-1 The addition of the WECC designation to the NERC Standard nomenclature indicates the document is a RRS. A number of regional standards predate this numbering system (e.g., BAL-STD-002-0). As these standards are revised in the normal regional standards development process, WECC will revise the numbering to reflect the system described here. Document Type Designations A WECC Regional Criterion will be designated with a CRT designation. Documents previously designated as a WECC Regional Business Practice (RBP) have been recategorized as WECC Regional Criteria designated with a CRT designation. 12 The following example would apply to a CRT. Example... TPL-001-WECC-CRT-1.1b TPL... Three-letter designation to identify the general topical area of the criterion. WECC uses the same topic designations as NERC Three-digit numeral within the above topical area. These numbers will be assigned sequentially for new documents. WECC... Four letters that designate WECC origination. CRT... Three-letter designation to indicate this document was drafted under the development procedures as a regional criterion. 11 Should an exception to the nomenclature be encountered, WECC Standards personnel will assign the exception. 12 See WECC Board of Director s package June 2014.

10 WECC Glossary Page 10 of One-digit numeral identifying the version of the document, starting with the numeral 1 for new documents. For modified documents this is a sequential number to indicate how many times the original version has been modified. Errata with an Interpretation If a document has an erratum, the identification will include a period after the last number. The numbering after the period will be sequential. In the following example, assume the WECC Criterion has both an erratum as well two interpretations. The resulting nomenclature would be: EOP-007-WECC-CRT-1.1b The 1 is the version. The.1 is the single erratum. The b indicates the there are two interpretations. Interpretations Numbering If a document has an approved interpretation, the assigned nomenclature will have a lowercase letter after the version number. For each interpretation added to a particular document, the lowercase letter will sequence through the alphabet. For example, if there were two approved interpretations in the below example, the interpretation would be designated as: TPL-001-WECC-CRT-1.1b. Renaming WECC Regional Business Practices to WECC Criteria On June 25, 2014, the WECC Board of Directors (Board) approved the elimination of the Regional Business Practice (RBP) categorization in favor of a single WECC Criterion (CRT) category. No substantive changes were made as a result of the classification change; only the designation nomenclature has been changed. All INT WECC RBPs were reclassified as WECC CRTs. For example: INT-001-WECC-RBP-1 becomes INT-001-WECC-CRT-1 INT-002-WECC-RBP-1 becomes INT-002-WECC-CRT-1.

11 WECC Glossary Page 11 of 12 Categories/Abbreviations Used in NERC Standard Numbering Convention Abbreviation BAL CIP COM EOP FAC INT IRO MOD NUC ORG PER PRC TOP TPL VAR Standard Area Resource and Demand Balancing Critical Infrastructure Protection Communications Emergency Preparedness and Operations Facilities Design, Connections and Maintenance Interchange Scheduling and Coordination Interconnection Reliability Operations and Coordination Modeling, Data, and Analysis Nuclear Organization Certification Personnel Performance, Training, and Qualifications Protection and Control Transmission Operations Transmission Planning Voltage and Reactive

12 WECC Glossary Page 12 of 12 Version Date Action Change 0 May 1, 2014 Initial Update All current WECC Regional Business Practices and WECC Criteria were reviewed for inclusion into Version Zero. 0 May 5, 2014 Errata Included Contingent Firm. Previously omitted. 1 May 21, 2014 WSC approved Preamble added. 1 June 25, 2014 WECC Board of Directors (Board) WECC Board eliminated the Regional Business Practice (RBP) designation in favor of the WECC Regional Criterion (CRT) designation. See Board minutes for June 25, August 11, 2014 Errata Firm Contingent Energy was deleted from the Term to match INT-018-WECC-CRT-1. In the definition for Capacity Associated with Energy Recallable for Reserves Authorities was changed to the possessive form Authority s. 2 March 10, 2015 WSC approval Terms used on in MOD-001-WECC-0 were deleted from the glossary. The MOD was retired by the WSC pursuant Step 13 of the Reliability Standards Development Procedures. 3 March 8, 2016 WECC Standards Committee Approved Removed Performance Level Adjustment Record ; TPL-001- WECC-CRT-2, WR1 retired on October 8, WECC Remedial Action Scheme Database and Wide Area Protection Scheme (WAPS) reference for EOP-007-WECC-CRT-1.1 (retired July 1, 2013) updated to PRC-(012 through 014)-WECC- CRT-2.1. Associated PRC-(012 through 014)-WECC-CRT-1 updated to 2.1. WOULD in WAPS changed to lower case. NOT in LAPS changed to lower case. 4 December 6, 2016 WECC Standards Committee Approved INT-020-WECC-CRT-1.1 updated to 1.2. TPL-001-WECC-CRT-2.1 updated to 2.2. INT-018-WECC-CRT-1 updated to 1.2. PRC-006-WECC-CRT-1 updated to 1.1. Adjacent Transmission Circuits, used in TPL-001-WECC-CRT-2.2 was removed as it is no longer contained in TPL-001-WECC-CRT-3, as approved by the WECC Board of Directors. September 21, 2016.