Which of the following must be included in a Transmission Operator's GMD Operating Procedure according to EOP-010?

The correct choice involves defining steps or tasks for receiving space weather information, as this is a critical component of a Transmission Operator's GMD Operating Procedure according to EOP-010. GMD, or geomagnetic disturbance, can significantly impact the operation of the transmission system, and understanding and reacting to space weather is essential for maintaining grid reliability.

The requirement to include steps for receiving space weather information emphasizes the importance of being informed about solar activity, such as solar flares or coronal mass ejections, which can influence geomagnetic conditions on Earth. Operators need to be equipped with the procedures to obtain timely and relevant data about these events in order to make informed decisions and take appropriate actions to mitigate potential impacts on the electric grid.

The other choices, while important in operational practices, do not directly relate to the specific requirements outlined in EOP-010 for a GMD Operating Procedure. For instance, while meter calibrations, equipment maintenance schedules, and training requirements are vital for overall system performance and reliability, they are not explicitly mandated within the context of GMD response procedures as outlined by EOP-010.