What is a disturbance report and when is it typically required?

• A. An informal note to the operator after the event.
• B. A formal report documenting the event and its timing, submitted within the specified window to the Reliability Authority.
• C. A daily summary of events regardless of timing.
• D. A financial incident report unrelated to reliability.

Answer: (B)

A disturbance report is a formal record of a significant reliability event, detailing what happened and when. It should capture the event’s timing, how long it lasted, the equipment or elements involved, the areas affected, the sequence of events, possible causes, operator actions taken, and the restoration status. The report is required to be submitted within a defined reporting window to the Reliability Authority, ensuring timely, standardized information for post-event analysis, regulatory compliance, and continuous improvement.

This is the best description because it emphasizes both the formal nature of the document and the specific timing window for submission, which are the key elements of how disturbances are formally tracked and reviewed. The other options describe informal notes, routine daily summaries, or financial reports that aren’t tied to a specific reliability disturbance and thus don’t meet the intent of documenting a reliability event in a consistent, timely way.