What term is used to describe a plant that is managed by a system operator for central dispatch?

The term that best describes a plant managed by a system operator for central dispatch is "Scheduled Generating Plant." This designation indicates that the plant operates within a coordinated framework, where its generation schedule is determined based on system needs, demand, and grid requirements. The scheduling aspect highlights the systematic approach of integrating different power generation sources to maintain balance and reliability in the grid.

In this context, a "Scheduled Generating Plant" operates under specific guidelines and schedules, allowing for optimized management of electricity supply. It ensures that the plant can respond to the commands of the system operator, aligning its output with the overall objectives of the power system, such as load forecasting, generation availability, and operational efficiency.

While other options may mention various aspects of power plants, they do not capture the precise relationship and operational nuances implied by the term "Scheduled Generating Plant," which emphasizes the necessity of coordination and centralized management in power generation.