Because the electricity grid is interconnected, power flow is not linear or directed (it's impossible to tell energy exactly where to flow); instead, the flow of energy is determined by the entire system.
Electricity naturally moves from generation sources to consumption points, favoring paths with the least resistance.
The impact of any new grid connection on overall power flow is complex, with the magnitude determined by factors like electrical proximity. Because power flow is governed by the entire grid, the intricate interaction of all grid elements prevents the use of a single, simple rule to classify how a connection at one point will affect other interconnections.