The "private capital" you're talking about is largely on top of the massive funds from government sources. In most countries it was
entirely built out by central governments.
Re: taxes - please look at your line items and notices the various "fees" you're charged.
I think the problem here is that you believe that utilities should be generating massive profits. Given they're backed by the state - PG&E literally got laws made to retroactively reduce their liability - then any profit that they make or distribute is tax payer money.
Let's put this super simply:
Let's say the company makes $X a profit, and distributes $Y to shareholder and executive remuneration (annually).
After N years they have made N$X, given out N$Y to owners, etc, their bank balance is Z=N($X-$Y) (obviously exact amounts change year to year, but we're being simple here). If Z is less than 0 then they've been running at a loss for N years, and we'd have no problem saying they should go bankrupt - they would have long since lost the ability to get loans, etc.
Now, let's say this is a public utility, then their annual profit is made up of:
1. Revenue in the form of below market resources costs (e.g. they don't pay market rates for land)
2. Revenue from state granted fees
3. Other tax related subsidies
So lets put these altogether and say $X = (actual profit) + $T (T=tax payer).
So after N years, they've received N$T funds. So if their bank balance is below $T, and $Y is greater than zero, they have been running at a loss, and they've been paying out the owners with tax payer money. Eg. they are taking tax money that is intended to support the utility and divesting it.
This is what PG&E did.
They took fees, and they took tax payer money. Then they "reduced" their expenses by reducing maintenance. That gave them a "profit" they divested to private interests. Now, when the costs of their failure to maintain infrastructure came due they couldn't afford it. Which means they're now taking even more tax payer money. Even if the company is taken apart, that money doesn't cover the costs they have inflicted.