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The Commission proposed to approve Reliability Standard TPL-007-1 (Transmission System Planned Performance for Geomagnetic Disturbance Events). Proposed Reliability Standard TPL-007-1 established requirements for certain entities to assess the vulnerability of their transmission systems to geomagnetic disturbance events (GMDs), which occur when the sun ejects charged particles that interact and cause changes in the earth’s magnetic fields. Entities that do not meet certain performance requirements, based on the results of their vulnerability assessments, must develop a plan to achieve the requirements. The North American Electric Reliability Corporation (NERC), the Commission-certified Electric Reliability Organization, submitted the proposed Reliability Standard for Commission approval in response to a Commission directive in Order No. 779. In addition, the Commission proposed to direct that NERC develop modifications to the benchmark GMD event definition set forth in Attachment 1 of the proposed Reliability Standard so that the definition is not based solely on spatially-averaged data. The Commission also proposed to direct 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).