Each Generator Operator with a Blackstart Resource shall notify its Transmission Operator of any known changes to the capabilities of that Blackstart Resource affecting the ability to meet the Transmission Operator's restoration plan within _____ following such change.

• A. 8 hours
• B. 24 hours
• C. 12 hours
• D. 48 hours

Answer: (B)

Blackstart resources are special generating units that can start the Bulk Electric System without external power, and the restoration plan depends on knowing what these resources can and cannot do. When a Generator Operator becomes aware of changes to a Blackstart resource’s capabilities that could affect meeting the Transmission Operator’s restoration plan, the notice must be given within 24 hours. This one-day window keeps the Transmission Operator informed in time to adjust the restoration sequence, reallocate resources if needed, and maintain coordinated recovery efforts. The 24-hour period strikes a balance between urgent communication and the practical need to assess the change and communicate it clearly. Shorter windows (like 8 or 12 hours) could be too tight for some changes, while a longer window (such as 48 hours) risks the plan becoming out of date. The notification should describe the change, the expected duration, and the impact on the restoration plan so that the Transmission Operator can update actions accordingly.