Which action would typically be taken FIRST to control a reactive transfer limit?

The first action typically taken to control a reactive transfer limit is to load offcost (out of merit) generation. This approach addresses reactive power issues effectively by bringing in additional sources of reactive support. When the system experiences high demand or limited capacity to transfer reactive power, engaging these offcost generators helps maintain the stability of the grid by injecting reactive power where it's needed.

This method is crucial because reactive power is essential for voltage control, and operating the system within safe limits is vital for reliable electricity supply. Out of merit generation can provide the necessary support without compromising the overall efficiency of the network, especially when immediate corrective actions are required to maintain system reliability.

Choosing this action focuses on effectively managing the immediate reactive power needs before considering other options, such as adjusting generation levels or altering voltage limits, which may take more time and have broader implications on system performance.