When does the Contingency Reserve Restoration Period commence?

The Contingency Reserve Restoration Period begins at the end of the Disturbance Recovery Period. During the Disturbance Recovery Period, system operators work to stabilize the grid and mitigate the immediate impacts of a disturbance. Once the system is deemed sufficiently recovered and stable, the focus shifts to restoring contingency reserves, which are vital for addressing potential future disturbances. This transition signifies that immediate recovery efforts have been completed and that operators can start the process of restoring resources that were utilized during the initial response.

Understanding this sequence is crucial in grid operations as it ensures that there are adequate reserves available for the next potential event, thereby maintaining reliability and stability in the power system. The other options suggest an earlier timing in the recovery process, which does not align with the systematic approach to restoring contingency reserves in a coordinated and efficient manner.