Go pick a few PG&E tariffs, look at the unbundled prices, compare them, and then try saying that it’s legitimate transmission and distribution costs again with a straight face…
I find the explanation that they neglected maintenance and upgrades in favor of dividends and stock pumping for years, and now we're paying off the last couple of decades of maintenance and upgrades in a new, more volatile wildfire climate for which PG&E has been assigned legal and financial liability.
I agree that it doesn't necessarily reflect the individual marginal cost of an additional customer, but that makes sense, things rarely do.
Specifically burying the lines so they survive forest fires.