I'm not a California resident so can't speak directly about the situation out there, but I can speak for solar here in Maryland. The power we generate with solar panels is purchased by the utility company, but technically NOT at "retail prices". (That's generally a fallacy perpetuated by the folks against solar.) They DO probably pay more than they'd prefer to pay (a rate that's a bit higher than their true cost to generate the same amount of electricity themselves), but we have to pay the transmission costs for it to get carried down the wires back to the utility company.
In general, what I've observed around here is that quite a few people who are more "middle class" than "rich" are the ones with PV solar on their roofs. Most of the time, they did a solar lease or "PPA" agreement so their up-front cost to have the panels installed was as little as zero, or as much as maybe a few thousand dollars paid up front in order to secure a better deal on the terms of the lease agreement.
I'm one of the exceptions in our town who decided to buy my panels straight out, but our family couldn't really afford to do that either. I had to get a "solar loan" from a lender offering it, after scraping up about $9,000 to pay upon completion of the work. (That will come back to me as the Federal tax credit for going solar, but they pay it back in stages, at least given my own tax situation. So I have to wait until next tax year to recoup the rest of the credit.) The rest of the cost will get paid off over the next 12 years on this solar loan, at an interest rate of close to 8%. So essentially, I'm gambling here on whether or not the whole project EVER really gives me a positive return on my investment. I *think* it can, but it's really a long term projection..... They estimate the panels will last as long as 25-30 years, and I bought SunPower branded stuff (which has a little less performance drop-off over time than many other cheaper panels). The inverters will almost surely need to be replaced once or twice during that length of time
Meanwhile, what will power cost in 20 years? The same price as today or close to it? Somehow I doubt that.... and I doubt that enough to take this type of bet as insurance against higher costs on it. But in any case, my system only covers about 60-68% of our total energy usage needs. There's just not enough usable roof space facing the right direction for it to be cost effective to add more capacity. (A problem I see with MANY homes doing solar.)
I guess my point, though, is this: PV solar isn't typically going to make this massive energy savings that some people think when they see the "cool looking solar panels" all over a property. When govt. started with the subsidies on it, it was because the tech. made NO economic sense at all without that padding added to the equation and they were just trying to use our tax money to jump start the whole industry.
Today, I think it *can* make some sense, but the wealthy really won't care about the small savings we're talking about seeing with it! If they do solar, it's merely for show and to give off that "feel good, eco friendly" vibe. The upper class can easily afford to pay their electric bills as a very SMALL part of their total income.