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The Commission approved Reliability Standard TPL-007-1 (Transmission System Planned Performance for Geomagnetic Disturbance Events). The North American Electric Reliability Corporation (NERC), the Commission certified Electric Reliability Organization, submitted Reliability Standard TPL-007-1 for Commission approval in response to a Commission directive in Order No. 779. Reliability Standard TPL-007-1 established requirements for certain registered entities to assess the vulnerability of their transmission systems to geomagnetic disturbance events (GMDs), which occur when the sun ejects charged particles that interact with and cause changes in the earth’s magnetic fields. Applicable entities that do not meet certain performance requirements, based on the results of their vulnerability assessments, must develop a plan to achieve the performance requirements. In addition, the Commission directed NERC to develop modifications to Reliability Standard TPL-007-1: To modify the benchmark GMD event definition set forth in Attachment 1 of Reliability Standard TPL-007-1, as it pertains to the required GMD Vulnerability Assessments and transformer thermal impact assessments, so that the definition is not based solely on spatially-averaged data; to require the collection of necessary geomagnetically induced current monitoring and magnetometer data and to make such data publicly available; and to include a one-year deadline for the development of corrective action plans and two and four-year deadlines to complete mitigation actions involving nonhardware and hardware mitigation, respectively. The Commission also directed NERC to submit a work plan and, subsequently, one or more informational filings that address specific GMD-related research areas (Docket No. RM15-11-000).