Which condition is the system operator typically trying to prevent during periods of low generation?

During periods of low generation, the system operator focuses on preventing low voltage conditions. When generation is low, there is less electricity being produced to meet consumer demand. The balance between supply and demand is crucial, as any significant imbalance can lead to a drop in voltage levels. Low voltage can cause issues such as equipment malfunctions, inefficiency in power delivery, and potential damage to customer equipment or other parts of the electric grid.

The system operator employs various measures to ensure that voltage levels remain stable, such as activating reserve generation capacity, managing loads, or utilizing grid support resources. By maintaining system stability and preventing low voltage, the operator ensures reliable service to consumers and minimizes the risk of more severe issues, such as brownouts or blackouts.

The other options represent outcomes that may be of concern but are not the primary focus during low generation periods. High voltage might be a concern under different conditions, and both over generation and under generation represent other types of imbalances that would typically be prevented or managed in different contexts. Thus, the primary condition to avoid during low generation scenarios is low voltage.