The California 'Solar Tax' (NEM 3.0)
California's new solar rules (NEM 3.0) killed export credits. Learn why batteries are now mandatory and how to design a self-consumption system.
If you live in California and you are thinking about solar, stop reading old articles. The rules changed in April 2023, and if you don't understand NEM 3.0, you are going to lose money.
The Old Deal (NEM 2.0) Under the old rules, for every kWh you sent to PG&E, they gave you full retail credit (say, $0.30). It was a 1-for-1 swap. You used the grid as a free battery.
The New Deal (NEM 3.0) The utility companies lobbied hard and killed that deal. Now, when you export power to the grid during the day, they pay you the "Avoided Cost." That is basically the wholesale rate. It’s about $0.04 to $0.05 per kWh.
But when you buy power from them at night? They charge you $0.40 to $0.60 per kWh.
It’s a rigged game. If you install a solar-only system in California today, you are selling diamonds for pennies and buying them back for dollars. The payback period stretches from 5 years to 12 years.
The Fix: Self-Consumption The strategy has shifted completely. The goal is no longer "Export." The goal is "Self-Consumption."
You must buy a battery.
With a battery, you store that cheap solar power during the day. Then, at 7 PM when rates skyrocket, you drain the battery. You never sell to the grid, and you never buy from the grid. You become an island.
Pro Tip From the Field "I tell my California clients: 'Solar without a battery in 2026 is like buying a car without tires.' It just doesn't work.
But here is the silver lining: Even with the extra cost of the battery ($12k), the ROI is still decent. Why? Because PG&E rates are insane. They are approaching $0.60/kWh. Avoiding that cost is so valuable that the battery pays for itself in about 7-8 years. Plus, you get blackout protection for free. Don't let NEM 3.0 scare you away; just understand that the battery is now mandatory."
FAQ: California Rules
- Q: Can I get grandfathered into NEM 2.0?
- A: Only if you submitted your interconnection application before April 14, 2023. If you buy a house with an existing NEM 2.0 system, that status usually transfers to you for the remainder of the 20-year term.
- Q: What size battery do I need?
- A: You typically need enough to cover your usage from 4 PM to midnight. For most homes, one or two Tesla Powerwalls (13-27 kWh) is the sweet spot.
- Q: Does this affect other states?
- A: Yes. Other states (like Arizona and North Carolina) are watching California and implementing similar "Net Billing" schemes. The trend is moving away from full retail credit."