What is the key characteristic of a Scheduled Generating Plant?

A Scheduled Generating Plant is characterized by being subject to central dispatch. Central dispatch involves a system where the operation of generating units is controlled and optimized to meet the demand for electricity in the most efficient way possible. This means that the plant's output is managed by a central authority, ensuring that it generates power when needed and in a way that aligns with the overall grid management and resource efficiency.

This characteristic distinguishes scheduled plants from others, as it reflects their integration into a coordinated system that aims to balance supply and demand effectively. By being part of a central dispatch system, these plants can contribute to grid stability and reliability, responding to the needs of the network while adhering to operational guidelines.

In contrast, the other options do not accurately reflect the nature of scheduled generating plants. They either imply limitations on operation or mischaracterize the plants’ operational structure within the electricity market.