Well... I own a small, self-made (legally here, France) domestic p.v. with small storage (5kWp/8kWh LFP). The storage is just a very expensive backup able to keep the home when I do not need heating from one sunny day to another, able just to keep few hours with minimum heating.
I regret I've not chosen back than a 10kWp/24kWh to being able to go from a day to another with heating, reaching hours where eventually I can power up an ICE generator to recharge because well... It's exactly in winter that I need heating, where there is the littlest Sun and when grid-disruptive storms likely happen (NOT happened so far for more than little time, but still...). At current Chinese prices it's sensible. At current local price it's not even for self-made solutions, it's totally fool for ready-made solutions by a local pro. To give some numbers my system was 11.500€ 4 years ago. The cheapest professionally made one similar but INFERIOR to mine was ~30.000€, the most expensive ~50k.
Long story short, I do not know in the US, but a current southern/center EU prices p.v. is not an economically sound choice if not self made, there is simply way too much speculation, like on EVs, where the same Chinese imported EV in Thailand costs less than 9k€ while the same vehicle cost a bit less than 40k here (eg. https://asia.nikkei.com/content/1f9ed40b4b44745e1a39fafaf94b... to have the Thailand price in BTH and USD).
At this rates there is no new deal.
About underestimating... Well... We have no seasonal storage. So we can't run a grid with p.v. apart of anything else. We can't even run a home with p.v. only, simply because OR we use something else to heat and recharge EVs or we need the size of the home itself of panels and storage, witch could last theoretically 10 years. So personally in a new home with an EV I produce around 50% of my energy needs and I'm in the southern Alps at 1030 so a very good place for p.v.
We should do much more, of course, but the dream of a renewable only grid is still a dream, possible in some areas of the world, like Norway with mountain hydro, nearly possible in some others, like Swiss but definitively not possible on scale. Beside that remember a thing: a modern home consume 1/7-1/10 of a "classic" one, thanks to mere design and insulation. We could converge to electricity with new homes ONLY on scale, we cannot with classic ones. We could converge to electricity on scale for cars if we mandate WFH for all eligible jobs, not without that.
That's to say is a MUST understanding what we need to implement the new deal, because what we need it the opposite of what big corps want.