Solar is still worth it in California under NEM 3.0, but the winning design changed. Because the Net Billing Tariff credits exported power at low, time-varying avoided-cost rates, the savings now come from using your own solar instead of selling it, so most homeowners pair panels with a battery sized to cover the 4-9 pm peak. Skip the battery and a typical NEM 3.0 system can lose half its bill savings to cheap daytime exports.
Key takeaways
- NEM 3.0 (the Net Billing Tariff) credits exported solar at low avoided-cost values, so selling power to the grid no longer pays the way it did under NEM 2.0.
- A battery shifts midday solar into the expensive 4-9 pm window, which is where self-consumption restores most of the lost savings.
- Size storage to your evening peak, not to your whole house, and check your specific utility because PG&E, SCE, and SDG&E price the peak differently.
- Battery storage qualifies for the 30% federal Residential Clean Energy Credit.
- Model solar-only against solar-plus-storage on your exact tariff before you sign anything.
- Why your exported power is worth less now
- Why solar still pays in California
- How a battery brings the savings back
- Sizing storage for the 4-9 pm peak
- PG&E, SCE, and SDG&E are not the same
- Solar-only vs solar-plus-storage under NEM 3.0
- A checklist for designing solar plus storage
- Common NEM 3.0 design mistakes
- The 30% federal credit covers batteries too
- Model your exact tariff before you buy
You heard it at a barbecue or in a comment thread. "Solar isn't worth it in California anymore." The person saying it is half right and half wrong, and the gap between those halves is worth real money. NEM 3.0 did change the math. It did not erase it. What changed is the strategy, and a homeowner who understands the new strategy can still cut a large California electric bill down to a small one.
Why your exported power is worth less now
California regulators replaced the old net metering rules with a new structure called the Net Billing Tariff, widely known as NEM 3.0. It applies to systems whose interconnection applications were submitted on or after April 15, 2023, for new customers of PG&E, SCE, and SDG&E (CPUC). The headline change is simple. Under the old rules, a kilowatt-hour you exported earned close to the retail price you would have paid for it. Under NEM 3.0, exported power earns an avoided-cost value that is lower and that shifts hour by hour.
The California Public Utilities Commission explains that the Net Billing Tariff values customer exports based on what the grid avoids paying for that energy at the time it is sent, replacing the older retail-rate credit and putting more weight on energy used on-site.
CPUC, NEM Revisit
Read that twice. The value of a solar system stopped depending mostly on how much power it makes and started depending on when you use that power. A panel pointed at a noon sun still produces plenty. The question is whether that production lands on your own appliances or flows out to the grid for a small credit.
Why solar still pays in California
Here is the part the "not worth it" crowd skips. California has some of the highest retail electricity prices in the country (EIA). Every kilowatt-hour your panels feed straight into your house is a kilowatt-hour you do not buy at that high retail rate. That offset did not shrink under NEM 3.0. If anything, rising rates make each self-used solar kilowatt-hour more valuable over time.
So the savings did not vanish. They moved. They moved away from the meter spinning backward and toward the power you consume on-site during the hours you would otherwise pay the most. The trick is making your solar production line up with your own demand, and that is exactly the gap a battery fills.
It helps to picture the two kinds of value separately. The first is the retail rate you avoid paying when your own panels run your fridge, your laptop, or your AC during the day. That value stayed strong. The second is the export credit you earn when surplus flows to the grid. That value dropped. A NEM 3.0 system that leans on the first kind of value does well. A system designed to lean on the second kind, the way many NEM 2.0 systems did, tends to underperform. The fix is to keep as much of your own production at home as you can.
How a battery brings the savings back
Think about a normal weekday. Your panels make the most power around midday, when nobody is home and the house draws little. Your bill, meanwhile, peaks in the evening when everyone returns, the air conditioning runs, dinner cooks, and the sun is gone. Under NEM 2.0 that mismatch barely mattered, since midday exports banked credit you spent at night at near the same rate. Under NEM 3.0 the mismatch costs you, because those midday exports now pay little.
A home battery closes the loop. It stores the cheap midday surplus and releases it into your home during the expensive evening hours, so you run on your own stored sunshine instead of grid power priced at the peak. This is self-consumption, and it is the core NEM 3.0 strategy. Industry guidance for going solar now treats storage as the standard companion to panels in markets with export-limited tariffs (DOE). The battery is not a luxury add-on. It is the component that converts low-value exports into high-value avoided purchases.
Picture the daily flow. Morning sun charges the battery and runs the house at once. By early afternoon the battery is full and any extra trickles to the grid for its small credit. Then at 5 pm, when prices climb and production fades, the battery starts discharging into your home and keeps the meter from pulling pricey grid power. You spend your cheapest energy during your most expensive hours. That single shift is the whole reason storage earns its keep under the new tariff, and it is why a well-tuned battery can recover most of what NEM 3.0 took from a panels-only design.
Sizing storage for the 4-9 pm peak
Many California time-of-use plans charge their highest prices roughly from 4 pm to 9 pm. That five-hour window is the target. You do not need a battery big enough to run your whole house all night off-grid. You need one big enough to carry your home through the peak, when grid power is most expensive and your exports are worth least.
Start by estimating how many kilowatt-hours your home actually pulls between 4 and 9 pm on a typical day. That number, plus a margin for hotter evenings and some reserve, points you to a battery size. Oversizing wastes money on capacity you rarely cycle. Undersizing leaves you buying peak power after the battery empties at 7 pm. The right size is the one that reliably spans your own evening, not a round number off a brochure.
One more sizing note. Many homeowners want backup during outages too. Whole-home backup and peak-shaving are related but not identical goals, and the battery and panel sizing that serves one may not serve the other. Decide which matters more to you before you size, because that choice moves the design.
PG&E, SCE, and SDG&E are not the same
NEM 3.0 is a statewide framework, but the three big investor-owned utilities run different rate plans underneath it (CPUC). The peak hours, the price gap between peak and off-peak, and the available time-of-use schedules vary by territory. A battery dispatch plan that is close to ideal for a PG&E customer can leave money on the table for an SDG&E customer on a different rate.
That is why a generic payback estimate from a national calculator can mislead a Californian. Your savings depend on your utility, your rate plan, your roof, and your evening usage together. Two neighbors on the same street served by the same utility can land on different best designs if one runs a heat pump and the other does not. The payback math is personal here in a way it was not under the simpler old rules.
Solar-only vs solar-plus-storage under NEM 3.0
The table below shows the directional difference between the two designs under NEM 3.0. Exact numbers depend on your utility and usage, but the pattern holds across territories.
| Factor | Panels only | Panels plus battery |
|---|---|---|
| Value of midday surplus | Exported at low avoided-cost rate | Stored for evening use |
| 4-9 pm peak power | Bought from grid at peak price | Covered by stored solar |
| Self-consumption share | Lower | Higher |
| Bill savings under NEM 3.0 | Reduced vs NEM 2.0 | Most savings restored |
| Outage backup | None on its own | Possible, if designed for it |
| Upfront cost | Lower | Higher, partly offset by credit |
| Payback direction | Longer under NEM 3.0 | Shorter for high evening users |
The cost of the battery is real, and panel and storage prices vary widely by installer and equipment (EnergySage). The point is not that storage is free. The point is that under NEM 3.0 the battery is usually what makes the whole system pay, by turning power you would have nearly given away into power you would have paid top dollar to buy.
A checklist for designing solar plus storage
Work through this before you commit to a system under NEM 3.0.
- Confirm your interconnection date falls under NEM 3.0 so you model the right tariff.
- Pull a full year of hourly usage from your utility account, not just monthly totals.
- Identify how much energy your home uses between 4 pm and 9 pm on a typical day.
- Size the battery to span that evening peak, with a margin for hot days.
- Decide whether outage backup is a goal, since it changes sizing.
- Match the design to your specific utility rate plan, not a national average.
- Run the federal 30% credit through your numbers for both panels and storage.
- Compare a solar-only quote against a solar-plus-storage quote side by side.
Common NEM 3.0 design mistakes
Most of the regret stories come from a short list of avoidable errors.
- Designing for export, not self-use. Building a large array to sell surplus made sense under NEM 2.0. Under NEM 3.0 those exports earn little, so an oversized panel count without storage can disappoint.
- Skipping the battery to save upfront cash. The cheaper system can deliver weaker monthly savings, which stretches payback rather than shortening it for high evening users.
- Sizing the battery to the whole house. You usually need to cover the 4-9 pm peak, not run every circuit all night, and oversizing buys capacity you rarely cycle.
- Trusting a national payback calculator. Your utility, rate plan, and evening usage drive the result, and a generic estimate can be off by a lot.
- Forgetting the credit applies to storage. Leaving the 30% battery credit out of the math makes storage look more expensive than it is.
The 30% federal credit covers batteries too
One reason storage pencils out better than people expect is the federal Residential Clean Energy Credit, which covers 30% of the cost of qualifying solar and battery storage (IRS). Standalone battery storage qualifies, not only panels (ENERGY STAR). That 30% comes straight off the part of the system that does the most work under NEM 3.0. When you compare a solar-only quote to a solar-plus-storage quote, apply the credit to both so the comparison is fair. The battery looks far less expensive after the credit lands.
Model your exact tariff before you buy
The single most useful thing a California homeowner can do under NEM 3.0 is stop guessing and model the real numbers. Because export value is time-varying and the three utilities differ, the only honest answer to "how much will I save" comes from running your own usage against your own rate plan for both a solar-only and a solar-plus-storage design.
This is where Enact fits. The problem is that NEM 3.0 savings depend on your specific utility tariff and your evening usage, which a brochure cannot capture. Enact models solar-only against solar-plus-storage on your exact California utility tariff in a free proposal, so you see the payback difference before you sign rather than after. Once the system is running, Enact Home monitoring shows your production and self-consumption so you can confirm the design is working as modeled. If you want the California-specific starting point, Enact lays out the options for residential solar in California. The strategy under NEM 3.0 is clear. Self-consume your solar, size storage to the evening peak, and check the numbers against your own utility. Do that, and the "solar isn't worth it" line stops applying to your house.
Frequently asked questions
Is solar still worth it in California under NEM 3.0?
Yes, for most homeowners, but the design that pays best changed. California's high retail rates mean every kilowatt-hour of solar you use on-site offsets expensive grid power (EIA). Under the Net Billing Tariff, savings come from self-consumption rather than from selling exports, which is why most NEM 3.0 systems pair panels with a battery (CPUC).
Do I need a battery under NEM 3.0?
Usually, if you want strong bill savings. Because exported power now earns a low avoided-cost value, a battery that stores midday solar for the expensive 4-9 pm peak is what restores most of the savings NEM 2.0 systems got from exports (CPUC). Storage is now treated as the standard companion to panels in export-limited markets (DOE).
How is NEM 3.0 different from NEM 2.0?
NEM 3.0 credits exports at lower, time-varying avoided-cost rates instead of near the retail rate. The Net Billing Tariff applies to interconnection applications submitted on or after April 15, 2023, for PG&E, SCE, and SDG&E customers, and it shifts the value of a system from exporting power to using it on-site (CPUC).
How big a battery do I need for the 4-9 pm peak?
Big enough to carry your home through your evening peak, not to run the whole house all night. Estimate how many kilowatt-hours you use between 4 and 9 pm, add a margin for hot days and reserve, and size to that. Outage backup is a separate goal that can change the sizing (DOE).
Does the federal tax credit cover home batteries?
Yes. The Residential Clean Energy Credit covers 30% of qualifying solar and battery storage costs, and standalone storage qualifies, not only panels (IRS, ENERGY STAR). Apply it to both the solar-only and solar-plus-storage quotes when you compare them.
Why does my California utility change the answer?
Because PG&E, SCE, and SDG&E run different rate plans under the same NEM 3.0 framework. Peak hours and the gap between peak and off-peak prices vary by territory, so the best battery dispatch and payback differ by utility (CPUC). Model your own tariff with a free Enact proposal rather than a national average.
Sources
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