What action would reduce the power flow on the tie-lines between source BA 1 and sink BA 2?

Increasing generation in the sink Balancing Authority (BA) would effectively reduce the power flow on the tie-lines between source BA 1 and sink BA 2 because it directly influences the demand and supply dynamics at play. When generation is increased in the sink BA, it enhances the local supply of electricity, which compensates for the demand in that area. This alleviates the reliance on the power flowing from source BA 1, thus lowering the power transmission across the tie-lines connecting the two balancing authorities.

In scenarios where the sink BA's generation capacity is increased, the need to import power from the source BA diminishes, leading to a reduced flow on the interconnecting lines. This is particularly vital for maintaining grid stability and ensuring that power is effectively balanced across the regions involved.

Considering the other choices, declaring an Energy Emergency Alert (EEA) or increasing generation in the source BA would not directly serve to reduce the flow on the tie-lines. An EEA typically indicates that there is a threat to system reliability, which might even necessitate increased power transfers to manage demand. Likewise, raising generation in the source BA would have the opposite effect, potentially increasing the power flow to the sink BA rather than reducing it. Buying more power from source