What type of events do Responsible Entities need to report according to NERC standards?

The correct response emphasizes the necessity for Responsible Entities to report significant reliability-related events, which is a crucial aspect of the NERC standards. Reporting such events allows for the identification and analysis of potential risks to the reliability of the bulk electric system. When significant reliability-related incidents occur, they can impact the operation of the grid and the overall system stability.

These reports enable an ongoing assessment of the reliability of the grid, help identify trends or recurring issues, and foster a culture of continuous improvement and transparency among entities in the energy sector. This is essential for maintaining high standards of reliability, safety, and compliance with regulatory requirements.

In contrast, while transmission line failures could be relevant, they may not fall under the umbrella of "significant" events unless they pose a substantial risk to system reliability. Customer complaints, although valuable for customer service improvements, do not inherently impact the technical reliability of electric service. Lastly, maintenance schedules, while important for operations and safety, do not pertain to reporting reliability-related events as outlined in NERC's standards.