What does a unit start-up notification signify?

A unit start-up notification signifies that units must be in readiness within 48 hours. This notification serves as a crucial communication from the system operator, indicating that specific generating units need to prepare for potential operation and be capable of delivering power to the grid when required.

This timeframe allows sufficient preparation for the units to come online, ensuring that they can meet the demand when needed, while also considering factors such as maintenance, fuel supply, and operational checks. The 48-hour window is standard for many operational protocols in power generation, providing a clear guideline for operators to follow.

In contrast, the other choices suggest either shorter time frames or actions unrelated to unit readiness, which do not align with the established protocols regarding the timing and responsibilities entailed in a unit start-up notification.