Which of the following methods may Reliability Coordinators use to manage transmission outages?

The choice to verify that voltage control equipment is on automatic is correct because it plays a crucial role in maintaining system reliability during transmission outages. When a transmission line is taken out of service, managing voltage levels becomes essential to prevent voltage instability, which can lead to cascading failures in the grid. Automated voltage control equipment, such as capacitor banks or voltage regulators, helps to stabilize voltage by automatically adjusting reactive power flow in the system. This automatic adjustment ensures that the voltage remains within acceptable limits, supporting grid reliability and enhancing the overall operational efficiency during outages.

By contrast, the other options, while related to managing power systems, may not directly address the immediate needs during transmission outages in the way that verifying automatic voltage control does. Increasing power output at all generators could lead to overloading and is not a selective measure to manage outages. Disconnecting high voltage lines could exacerbate the problem by worsening system stability and is typically a last resort. Removing Load Tap Changer transformers from operation could hinder voltage control rather than assist in managing outages efficiently. Thus, verifying voltage control equipment is the most effective and appropriate method for Reliability Coordinators to maintain system reliability during transmission outages.