In a tight generation and reactive resources condition, which scheduled job should proceed?

In scenarios where there is tight generation and reactive resource availability, it is crucial to ensure that the existing infrastructure can reliably support the demand for electricity. Maintenance of high-voltage reactive resources, such as a shunt reactor, is essential in stabilizing the voltage levels on the transmission system. A shunt reactor helps absorb excess reactive power during low-demand periods and supports voltage levels, which is critical to maintaining the reliability of the electrical grid under tight conditions.

Prioritizing the maintenance of the shunt reactor ensures that the system remains balanced and can effectively handle any fluctuations in load or generation. This allows for better voltage control and system reliability, especially during times of stress when reactive power resources may be limited.

In contrast, other options like substation upgrades, load forecasting reviews, or transmission line expansions might not address immediate reactive support needs. While these tasks are important for long-term system improvement, in a tight condition, ensuring the existing reactive power resources are functioning optimally takes precedence. Therefore, scheduling the maintenance of the 735 kV shunt reactor is the most prudent choice in this context.