What is a primary characteristic of a dynamic reserve?

A primary characteristic of a dynamic reserve is its ability to respond quickly to contingencies. Dynamic reserves are specifically designed for situations that require immediate action, such as unplanned outages or sudden changes in system demand. Unlike fixed reserves, which may not be activated unless there is a significant system issue, dynamic reserves can be mobilized at a moment's notice to maintain grid stability and reliability.

In contrast, a fixed and unchanging reserve does not provide the flexibility necessary to adapt to unexpected situations. The designation of only being used in emergencies implies a more reactive strategy rather than the proactive and rapid response characterized by dynamic reserves. Additionally, operation on a schedule pertains more to reserves that are planned for regular use, which is distinct from the immediate responsiveness that defines a dynamic reserve. Thus, the ability to quickly address and adapt to changing conditions is what makes the characteristic of a dynamic reserve vital to the operation of power systems.