If anything, I would expect a publicly run utility to be less efficient at capital allocation. All "excess" capital may get used up in the inefficiencies instead of investments.
Consider the challenges of city-wide transportation networks in providing service, maintaining infrastructure and investing for the future.
Alternatively, neither private nor publicly run capital is good at discounting the far future.
Sending the capital to maintenance would be a politically driven project right now for public utility. For private company even right now it is still a conflict of interests between maintenance and shareholder interests.
Consider the following regarding NY, DC & SF subway systems:
"How Politics and Bad Decisions Starved New York’s Subways Disruptions and delays have roiled the system this year. But the crisis was long in the making, fueled by a litany of errors, a Times investigation shows." 2017 https://www.nytimes.com/2017/11/18/nyregion/new-york-subway-...
"Metro sank into crisis despite decades of warnings Metro’s failure-prone subway — once considered a transportation jewel — is mired in disrepair because the transit agency neglected to heed warnings that its aging equipment and poor safety culture would someday lead to chronic breakdowns and calamities." 2016 https://www.washingtonpost.com/local/trafficandcommuting/met...
"Past decisions haunt BART as it seeks voter OK for $3.5 billion bond" https://www.sfchronicle.com/bayarea/article/Why-BART-s-futur...
It's amazing we're debating the pros/cons of public vs private utilities while we have an example of an incredibly corrupt private utility that needs to be shutdown and with execs thrown in jail for gross negligence.
They should not have spent the decade before the fires of the last three years paying generous dividends while deferring fire safety maintenance, as they were excoriated for this April by the judge overseeing their felony criminal sentence for the San Bruno gas explosion (who had the matter before him because the PG&E actions leading to the 2017 and 2018 fires were charged as, and ruled to be, violations of their probation for that criminal conviction.)
Or, maybe, repeatedly committing deadly crimes in the operation of public utility should mean you are no longer entrusted to operate that utility, and the instrumentalities of the crime should be forfeited to the government the same way they would be from any individual criminal, with someone else (public or private) less prone to deadly criminality given the job.
The main risk is high winds swinging the lines and trees far enough to contact, the resulting short can cause fires.
For this reason there's a standard for how far back trees should be trimmed for safety. Said standard was an excuse PG&E made for an additional funding request. When funded they didn't do the work, but instead paid a dividend.
So now we have richer stock holders and a utility that's decided to turn off the power instead of trim the trees.
>Six of the 10 most destructive fires in California history were started by electrical equipment. PG&E’s equipment has sparked 19 major fires in 2017 and 2018. The utility was blamed for last year’s Camp Fire that destroyed the town of Paradise and killed 86 people. SoCal Edison is under mounting scrutiny over potential links to the start of the Saddleridge fire in Sylmar. Edison’s power lines also started the 2017 Thomas fire in Ventura and Santa Barbara counties that killed two people.
Maybe they can start by replacing old, faulty equipment that is causing literally millions in damage and fatalities?