What is the immediate action to take in the event of a maximum generation request?

In the context of a maximum generation request, the correct immediate action is to activate black start units. Black start units are essential for restoring power to the grid following a blackout. They are specifically designed to start without an external power supply and can provide the critical initial generation required to stabilize the system and restore power to a larger network.

By activating these units, grid operators can manage the sudden demands more effectively and initiate the process of bringing additional generation resources online. This action is crucial in maintaining system reliability and ensuring a swift recovery from any disruption.

Increasing generation output may seem relevant, but it's often contingent upon the availability of certain resources and stability of the overall grid. Similarly, instructing demand resources to reduce consumption might be a strategy employed after initial stabilization, rather than the immediate response. Submitting interconnection data would typically be a procedural task not directly linked to handling an urgent generation request.