If a generator is offline for scheduled maintenance, what must be true regarding its communication status?

The correct answer highlights the importance of communication and coordination between the generator and the Transmission Operator during scheduled maintenance. When a generator is offline for maintenance, it is essential that the Transmission Operator is notified of its status. This communication is critical because, during this time, the generator may need to operate in manual voltage control to ensure stability and reliability in the transmission system, particularly if the generator is required to ramp up or come online shortly after maintenance is completed.

Maintaining this communication allows the Transmission Operator to manage grid stability effectively by understanding the current generation capacities and making necessary adjustments or preparations in anticipation of the generator returning to service. This proactive coordination helps mitigate risks associated with sudden changes in generation and helps ensure a smooth transition back to normal operations once maintenance is concluded.

The other options do not sufficiently address the communication aspect or make assumptions about the operation of the generator that could lead to complications in grid management.