What Is NEM 3.0? California’s Solar Policy and Home Batteries Explained
If you own solar in California — or are thinking about going solar — NEM 3.0 is the policy change that most affects whether your system pays off. It changed the rules for how much the grid pays you for excess solar power, and it changed them dramatically. For South Orange County homeowners on Southern California Edison, understanding NEM 3.0 is the starting point for any honest conversation about home battery storage in 2026.
What NEM 3.0 Is
NEM stands for Net Energy Metering — the billing arrangement that determines how much credit you receive when your solar panels produce more electricity than your home uses in a given moment and you send that excess back to the grid.
Under the original NEM 2.0 structure, California utilities credited solar customers at close to the retail rate for exported power — roughly $0.28–$0.32 per kilowatt-hour depending on the utility and time of day. That made the economics of rooftop solar in California among the strongest in the country.
NEM 3.0 changed that. It took effect April 15, 2023 for customers of Pacific Gas & Electric, Southern California Edison, and San Diego Gas & Electric. Under NEM 3.0, exported solar is compensated at the grid’s “avoided cost” rate — a wholesale-level number that averages around $0.05–$0.08 per kilowatt-hour. That’s roughly a 75% reduction in what the grid pays you for every kilowatt-hour you send back.
Are You on NEM 2.0 or NEM 3.0?
Your NEM status depends on when your solar system received Permission to Operate from your utility.
You’re on NEM 2.0 (grandfathered) if your system received Permission to Operate before April 15, 2026, and your interconnection application was submitted before April 14, 2023. NEM 2.0 protection lasts for 20 years from your original interconnection date. It also follows the home — if you sell the property, the remaining years of NEM 2.0 grandfathering transfer to the new owner. The final deadline to achieve Permission to Operate under NEM 2.0 grandfathering was April 15, 2026; that window is now closed.
You’re on NEM 3.0 if your solar interconnection application was submitted after April 14, 2023, or your system didn’t achieve Permission to Operate in time for NEM 2.0 grandfathering. Municipal utilities like LADWP and SMUD have separate policies and are not subject to NEM 3.0.
Not sure which you’re on? Check your SCE account online or look at your original solar interconnection paperwork — the date your system was approved for interconnection tells you everything.
What NEM 3.0 Means for Your Solar System
The core problem NEM 3.0 created is a mismatch between when your solar panels produce power and when you actually need it.
Solar panels produce most of their power between roughly 10 AM and 3 PM — midday hours when most South OC homes aren’t using much electricity. That surplus power gets exported to the grid. Under NEM 2.0, that export earned you close to retail value. Under NEM 3.0, it earns you roughly a quarter of what you’d pay to buy that same power back from SCE in the evening.
The evening is where the cost problem lives. SCE’s time-of-use rates charge significantly more for electricity used between approximately 4 PM and 9 PM — the peak demand window. Under NEM 3.0, you’re exporting cheap during the day and buying back expensive in the evening. The economics that made solar a clear financial win under NEM 2.0 look very different without storage.
Why a Home Battery Solves the NEM 3.0 Problem
A home battery changes the equation by eliminating the export-cheap-buy-back-expensive cycle. Instead of sending midday solar production to the grid at $0.07/kWh, a battery stores it. Instead of buying power from SCE during the evening peak at $0.28–$0.35/kWh, you discharge your stored solar. You’re self-consuming power that your panels generated for free and getting full retail value out of it.
That’s why solar-plus-battery has become the standard build for new California installations since NEM 3.0 took effect — and it’s why the retrofit market for existing solar homeowners is one of the most active segments in South Orange County right now. A battery doesn’t just add backup power. It fundamentally repairs the economics of a solar system that was designed for NEM 2.0 rules.
NEM 2.0 Customers: Can You Add a Battery Without Losing Your Rate?
This is the question we hear most often from South OC homeowners with older solar systems — and the answer is yes, with conditions.
The California Public Utilities Commission explicitly built battery storage exceptions into the NEM 3.0 transition rules. Adding a battery to your existing NEM 2.0 system does not affect your grandfathered status. You retain your NEM 2.0 export rates for the full 20-year period. The rules were written this way intentionally — the CPUC wanted to encourage storage adoption, not penalize it.
Two things to be careful about. First, do not add new solar panel capacity beyond the threshold (up to 1 kW or 10% of your originally approved system size, whichever is more) — adding storage alone is safe, but adding significant new solar can trigger a review. Second, if your solar system is leased rather than owned, the NEM 2.0 grandfathering technically belongs to the lease company. Call them before adding storage — most lease agreements allow it, but you need their sign-off.
Any qualified installer familiar with California interconnection rules will know this cold. If you’re talking to an installer and they seem uncertain about whether adding storage will affect your NEM status, find someone else.
NEM 3.0 in South Orange County
South Orange County sits entirely within Southern California Edison’s service area, which means NEM 3.0 applies to every new solar customer in Mission Viejo, Lake Forest, Laguna Niguel, Aliso Viejo, Rancho Santa Margarita, San Clemente, Dana Point, and surrounding cities. SCE’s time-of-use rate structure amplifies the battery-storage advantage — the evening peak window is when the cost gap between exporting and self-consuming is widest.
South OC also has one of the highest concentrations of NEM 2.0 grandfathered systems in California, given the region’s early solar adoption. A large portion of those homeowners have yet to add storage — and under the current rules, they can do so without affecting their grandfathered status. That’s a significant retrofit opportunity, and it’s the primary lead pool for home battery installers across the region.
Frequently Asked Questions
What is NEM 3.0?
NEM 3.0 is California’s current net energy metering policy, which took effect April 15, 2023 for PG&E, SCE, and SDG&E customers. It reduced the credit solar customers receive for exporting excess power to the grid from roughly $0.30/kWh to approximately $0.05–$0.08/kWh — about a 75% cut.
Does NEM 3.0 apply to me if I already have solar?
If your solar system received Permission to Operate before April 15, 2026, and your interconnection was submitted before April 14, 2023, you’re on NEM 2.0 for 20 years from your interconnection date. NEM 3.0 applies to new solar customers only.
Can I add a battery to my NEM 2.0 system without losing my grandfathered rate?
Yes. Adding battery storage to an existing NEM 2.0 system does not affect your grandfathered status. The CPUC built this exception in specifically to encourage storage adoption. Just don’t expand your solar panel capacity significantly in the same project, and if your system is leased, check with the lease company first.
Does my NEM status transfer if I sell my home?
Yes. NEM 2.0 grandfathering follows the property, not the owner. If you sell your home, the remaining years of NEM 2.0 protection transfer to the new owner — a meaningful selling point for South OC homes with solar.
Is a battery worth it under NEM 3.0?
For most South OC homeowners with solar — whether on NEM 2.0 or NEM 3.0 — a battery substantially improves the financial case for their system. The payback math is different from the NEM 2.0 era, but the ongoing bill savings from self-consumption are real and recurring. For a current picture of costs without the now-expired federal tax credit, see our California battery rebates guide →
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Ready to find out what a battery retrofit or new solar-plus-storage system would look like for your South OC home? Call (949) 782-4517 or fill out our short form and we’ll connect you with a certified local installer.
