Perhaps it would be worth it to make the distribution grid a public utility - as you say it's already paid off, often with the aid of large government subsidies. If the power companies wont play fair with independent power generation and storage entrepreneurs then perhaps it's time to cut them out of the equation. Inform them the cables have been claimed via eminent domain and will be paid for at an amount of (materials - subsidies) amortized over the next N years. They still control the bulk of power generation, at least at first, and get paid the same rates as everyone else. It would probably raise energy prices at first, but I don't see any way to get off fossils that doesn't, and it would facilitate a much faster and market-driven adaptation period.
You're forgetting the huge legacy maintenance costs. PG&E is scared shitless because the price they've been charging customers has been below the cost necessary to maintain leaky natural gas pipes. PG&E had to raise rates and is now undertaking a massive generational renovation process. The grid takes a constant life cycle maintenance plan. The fixed cost of installation is minuscule and already the risk had been borne by the installer. That's like the government saying "this Gmail experiment worked; Google thanks for the memories, eminent domain bitch."
First of all, I don't think you know what the word subsidies means. Credits and subsidies are two different devils. I honestly think someone smart explains this for each overreaching governmental naysayer. Subsidies is what solar panel producers, like Solyndra, receive. They are cash money and they are given to companies to distort the energy market. Credits are money you have earned that you don't have to pay to the government. You are paying the government less money you have earned. Its an offset to tax. Tesla makes a larger proportion of its revenue from subsidies and credits. If we were to equally apply your winners and losers strategy to all companies, lets start with companies that receive more of their revenue from the government than they do from actual sales. That's fair right? Nationalize a company that makes over 51% of its revenue from profiteering off the government?
But let's be honest with ourselves. You're not looking for equality in the name of the law. You support crony capitalism "for the right reasons." Playing fair has a lot of meanings. One definition of playing fair is not hiring lobbyists when you can't compete in a fair capitalist market. Another one that is much more subversive is a fair price. That's the fair you mean. When the government has already picked its winners and losers the producer who charges the lowest energy cost to the poor is not always the winner. You're interested in factoring in government kickbacks.
Let's do a Reductio ad absurdum. The producers aren't playing fair. They are charging the price of their costs plus profit plus government interference. Well since you plan on setting prices for the cost of energy all businesses are going to go out of business unless the government forces the cost of the inputs, oil, natural gas, silicon, et al. You can't just set the price of the end result. So let's go farther, to retrieve these natural resources takes capital and labor. Guess which one will be less costly to cut over the long run? I can make an automated natural gas miner a lot more economically efficient than I can cut the wages of employees.
Suddenly we not only have a cut in the labor force but we've subjected the poor to higher energy costs. Is that the end game? Because at this point I kinda feel that we're intentionally keeping the poor poorer with this false effort to man-make the temperature the same. Oh wait? Even if we enact these changes we don't expect to change the direction of the climate's increase (which hasn't increased for 20 years)? Wow than go ahead and explain sustaining the proletariat to me. Because you are better at it with government fiat than any capitalist selling $2 cream cheese at Walmat ever could be.
Always draw your curves, then plot your reading.