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TPL-007-1 — Transmission System Planned Performance for Geomagnetic Disturbance Events Page 1 of 26 A. Introduction 1. Title: Transmission System Planned Performance for Geomagnetic Disturbance Events 2. Number: TPL-007-1 3. Purpose: Establish requirements for Transmission system planned performance during geomagnetic disturbance (GMD) events. 4. Applicability: 4.1. Functional Entities: 4.1.1 Planning Coordinator with a planning area that includes a Facility or Facilities specified in 4.2; 4.1.2 Transmission Planner with a planning area that includes a Facility or Facilities specified in 4.2; 4.1.3 Transmission Owner who owns a Facility or Facilities specified in 4.2; 4.1.4 Generator Owner who owns a Facility or Facilities specified in 4.2. 4.2. Facilities: 4.2.1 Facilities that include power transformer(s) with a high side, wye- grounded winding with terminal voltage greater than 200 kV. 5. Background: During a GMD event, geomagnetically-induced currents (GIC) may cause transformer hot-spot heating or damage, loss of Reactive Power sources, increased Reactive Power demand, and Misoperation(s), the combination of which may result in voltage collapse and blackout. 6. Effective Date: See Implementation Plan for TPL-007-1 B. Requirements and Measures R1. Each Planning Coordinator, in conjunction with its Transmission Planner(s), shall identify the individual and joint responsibilities of the Planning Coordinator and Transmission Planner(s) in the Planning Coordinator’s planning area for maintaining models and performing the study or studies needed to complete GMD Vulnerability Assessment(s). [Violation Risk Factor: Lower] [Time Horizon: Long-term Planning] M1. Each Planning Coordinator, in conjunction with its Transmission Planners, shall provide documentation on roles and responsibilities, such as meeting minutes, agreements, copies of procedures or protocols in effect between entities or between departments of a vertically integrated system, or email correspondence that identifies an agreement has been reached on individual and joint responsibilities for maintaining models and performing the study or studies needed to complete GMD Vulnerability Assessment(s),
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