Why would solar prices go up under NEM3? I would think they will come down because less people will buy
Aside from inflation... after NEM 3.0 goes in effect, the smaller solar companies (who don't have the purchasing power to get ESS inventory) simply cannot function. During the previous round of discussions after the NEM 3.0 PD dropped, many CALSSA and SEIA members said that the values the CPUC were using in their ROI/Payback calculations was untenable.
As a refresher, here's the table. The CPUC felt that residential solar could be installed for about $2.60 per watt.
The installers argued that if $2.588 is the average per watt, then some installs would be over $2.60; while others would then logically have to be below $2.60. And there was no way an actual business could deliver solar onto a residential rooftop for such a pittance. Basically if a job were only paying $2.00 per watt, the installer couldn't take the project unless it was Tesla willing to sell at or below cost to drive top-line numbers. As
@Vines pointed out, it's expensive to run a construction company in California.
The CPUC responded saying their figures were good, and installers just need to do better to get their costs down.
So to that end, the only viable businesses have to incorporate energy storage solutions. Sunrun, Sunpower, Tesla, Semper, etc are all poised to only install PV+ESS systems in California as the solar-only business model vanishes. (edit: note, new construction has to come with solar, but Sunrun has a lot of those contracts locked up with major developers). Without as much competition, the prices will go up even if the economic terms for the buyer are less attractive with NEM 3.0 policies.
When I purchased my 7 kWp-AC PV system and 3 Powerwalls from Sunrun in 2020, the gross cash I paid was $57,000. That is over $8.00 "per solar watt" when factoring in all the equipment against just the PV. Thankfully there was a large-scale SGIP lol.
When a neighbor tried to get a quote for a similar system from Sunrun a few months ago, it was over $75,000 gross (yes, >$10 per solar watt). I doubt pricing is going to come down from here as the competition and options dry up. Installers need either volume or margin to run a business. With NEM 3.0 policies, business viability for installers will need to come from margin.