What would be necessary for a Balancing Authority if they cannot relieve an IROL violation after planned actions?

In situations where a Balancing Authority cannot relieve an IROL (Interconnection Reliability Operating Limit) violation even after executing all planned actions, shedding load becomes a necessary and effective response. Shedding load refers to the intentional disconnection of users from the power grid to reduce demand and stabilize the system. This action is crucial because it directly decreases the overall load on the system, thereby helping the Balancing Authority comply with operational limits and ensure system reliability.

By prioritizing safety and reliability, load shedding helps to avoid potentially catastrophic failures that could occur if the system is allowed to operate beyond its established limits. Load shedding can be a last resort when other measures, such as adjusting generation levels or seeking assistance, have not resolved the violation, making it an essential operational tool within the Balancing Authority's responsibilities to maintain system stability.

The other choices involve actions that might not effectively address the immediate issue of an IROL violation or could potentially exacerbate the situation. Hence, shedding load is the most direct and reliable method to return to compliant operational parameters.