What data is submitted by a generator for a scheduled generating unit that is used in preparing the day-ahead generation schedule?

The Capability and Availability Declaration is crucial for a scheduled generating unit as it provides essential data regarding the generator's maximum output capacity and its availability for operation during the upcoming day. This information is necessary for the system operator to effectively prepare the day-ahead generation schedule, as it ensures that the grid can be supported with the right amount of generation to meet forecasted demand.

Generators use this declaration to communicate their operational readiness and the expected output levels, which helps in balancing supply and demand in the electricity market. The data included in this declaration typically highlights any factors that might impact performance, such as maintenance schedules or unforeseen outages, which are critical for accurate day-ahead planning.

In contrast, while other options like Load Declaration, Power Sharing Report, and Operational Capacity Report may contain related information about operational strategies or load forecasts, they do not specifically address a generator's capability and availability for scheduling purposes. Thus, the Capability and Availability Declaration stands out as the key document used specifically for preparing a reliable generation schedule.