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NOTICE DATE: January 23, 2019
NOTICE TYPE: M-A062118-05 Operations
SHORT DESCRIPTION: Update - Request for Resource Entities and Transmission Service Providers (TSPs) to provide to ERCOT a list of Geomagnetic Disturbance (GMD) event contingencies for the benchmark GMD event for use in the GMD vulnerability assessment
INTENDED AUDIENCE: Resource Entities and TSPs
DAYS AFFECTED: January 22, 2019 and March 31, 2019
LONG DESCRIPTION: This Market Notice is to clarify ERCOT’s previous request. ERCOT requests that Resource Entities and TSPs provide a list of potential equipment removed from service as a result of Protection System operation or Misoperation due to harmonics that could result from the benchmark GMD event as described in “Table 1: Steady State Planning GMD Event” of North American Electric Reliability Corporation (NERC) Reliability Standard TPL-007-1, Transmission System Planned Performance for Geomagnetic Disturbance Events (GMD event contingencies).
ACTION REQUIRED: Resource Entities and TSPs are required to assess the impact of the benchmark GMD event on their equipment to develop the list of potential equipment removed from service during the benchmark GMD event. Send all responses via e-mail to with “Benchmark GMD Event” in the subject line by March 31, 2019. Additionally, Resource Entities and TSPs with no potential equipment that may trip offline due to harmonics during the benchmark GMD event should so state in their email submission. If a reply to ERCOT’s original request has been made applying the additional information in this request, no further action is required.
ADDITIONAL INFORMATION: On January 22, 2019, ERCOT partially implemented Planning Guide language associated with Planning Guide Revision Request (PGRR) 057, Responsibilities for Performing GMD Vulnerability Assessments. Specifically, paragraph (2) of Section 6.11, Process for Developing Geomagnetically-Induced Current (GIC) System Models, was unboxed. Remaining portions of PGRR057 will be implemented at a later date. PGRR057 aligns the Planning Guides with NERC Reliability Standard TPL-007-1, Transmission System Planned Performance for Geomagnetic Disturbance Events, by identifying responsibilities for performing studies needed to complete GMD vulnerability assessments.
In addition to Resource Entities and TSPs, this Notice is also issued to compliance contacts for all Generator Owners and Transmission Owners registered with NERC.
may be used as a reference to develop the requested list of potential equipment. This guide can be found on NERC website.
Please use the ERCOT Benchmark GMD Event Data Request form, which can be found on the ERCOT (PGDTF) landing page, for GMD event caused outages submission. The form also includes descriptions of the requested information.
Please review the ERCOT website forrelated to this subject.
CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at .
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