it's "ghost" economics, if for example i live in a house that choose to pay for coal power over hydro power, my money goes to the coal power plant (or at least not to the hydro plant) if i choose to pay for hydro, that money goes to the hydro plant instead (most likely not the coal plant)

if you actually dig into power co-ops and whatever other shenanigans you find, in the US at least, you will find there are multiple layers between "the utility" and who generates the power. For example, here where i live, we have a local power utility, who buys power from a power co-op, who buys power from power plants, and possibly other power co-ops? It's really disorganized, basically the TL;DR is that it wouldnt matter even if there were separate distribution lines. It's completely irrelevant based on the complexity of the actual market anyway lol.