You’re either hooked up or you’re not. Or you run multiple “grids” somehow which seems more economically wasteful and is legislatively tricky in terms of rights (to run lines, overhead or underfoot).
It seems like the cost of maintaining poles and transformers goes up a lot every year...
How to keep them honest?
It seems like you would have to regulate to the point of ($pure distribution company) being essentially a government enterprise in all but name.
Splitting the company into a 1) a government or quasi-government enterprise to handle the parts not suitable to the market, and 2) a much-less-regulated company handling the more market-amenable activities, could give the system as a whole a lot more of the efficiencies of a market system.
[1] https://en.wikipedia.org/wiki/California_electricity_crisis
But we're not there yet, so PG&E needs to find ways to not lose money on the grid hookup for customers who buy cheap forms of energy (or are, godforbid, energy-neutral with relation to the grid).