| Quick Answer: Under NEM 3.0, most California homeowners who want their solar to pay back do need a battery, because exported power now earns roughly a quarter of what it once did while evening electricity still costs full retail. Solari Storage installs Tesla Powerwall 3 and Lunar Energy systems across California and sizes them from your actual utility bill. Call (916) 507-1626 and we will tell you honestly whether storage makes sense for your house. |
For most of the last decade, solar panels in California worked on a simple bargain: send power to the grid during the day, take it back at night, and pay close to nothing. That bargain ended in April 2023. The panels did not change and neither did the sunshine, but the rules underneath both did, and the result is that a solar array without storage now behaves very differently than the one your neighbour installed in 2019. This article explains what changed, who is affected, and how to tell whether you specifically need a battery.
What Changed When California Moved to NEM 3.0?
NEM 3.0 — formally the Net Billing Tariff — applies to solar systems interconnected after April 2023, and it changed one number that changed everything else. Under the previous rules, power you exported to the grid earned close to what you paid for it. Under NEM 3.0 it earns roughly a quarter of that.
In practical terms, your utility now buys your surplus midday production for around eight cents and sells you electricity in the evening for up to sixty-two, depending on your utility and tariff. SDG&E’s summer peak sits at the top of that range, with PG&E and SCE typically running between fifty-two and fifty-nine cents on time-of-use plans. That gap is not a rounding error; it is the entire economics of home solar in California, and a battery is the mechanism for closing it.
Does NEM 3.0 Apply to Your System?
NEM 3.0 applies to your system based on when it was interconnected, not when you signed a contract or when the panels went on the roof. Systems interconnected before April 2023 generally remain on their original tariff for the term it was granted, which means a large number of California households are still on far more favourable export terms.
If you are on legacy NEM, a battery may still be worth having for outage protection or to hedge future rate changes, but the urgency is different. If you are on NEM 3.0, or you are considering solar now, storage is what determines whether the system pays back at all. Our NEM 3.0 explainer covers how to identify which tariff you are on from your bill.
Why Don’t Panels Alone Solve the Problem?
Solar panels alone cannot solve the NEM 3.0 problem because panels do not store anything. Production peaks around midday, when most households are empty, and drops off around sunset — which is precisely when the expensive hours begin.
So the power you generate at noon leaves your property at the export rate, and the power you need at seven in the evening comes back from the utility at the retail rate. The panels are working exactly as designed. The problem is timing, and timing is what a battery fixes. This is why, according to Wood Mackenzie and SEIA, sixty-nine per cent of new California solar customers now install a battery alongside the array.
Who Benefits Most From Adding Storage?
The households that gain most are those with significant evening consumption on a steep time-of-use tariff. If your family is home from four in the afternoon, running air conditioning, cooking and charging devices, you are buying electricity at the worst possible moment every single day.
Conversely, if you work from home and consume most of your power during peak production hours, you are already self-consuming a good share of what you generate, and the marginal value of storage is lower. It is still likely positive, but the payback arithmetic is different and worth running properly rather than assuming.
- High evening electricity use, particularly summer air conditioning
- A steep time-of-use tariff with a four-to-nine peak window
- An existing solar array on NEM 3.0 export terms
- Frequent outages or a location in a high fire-risk area
- Medical equipment or home working that cannot tolerate an outage
Is a Battery Worth It if You Don’t Have Solar Yet?
Increasingly, yes — and battery-only installs are a real option. A battery without panels can charge from the grid during cheap off-peak hours and discharge during expensive peak hours, which captures the time-of-use spread without generating anything.
That said, the strongest case in California remains solar plus storage, because self-generated power charging your own battery avoids both the export penalty and the peak purchase. Which configuration suits you is a question of your tariff, your roof and your budget, and it is worth deciding from numbers rather than from a general rule. The California Public Utilities Commission publishes the tariff structures that determine the answer.
How Do You Decide Without Guessing?
Start with your bill, not your roof. A recent utility bill shows your tariff, your usage shape across the day, and what you are currently being credited for export — the three inputs that decide whether storage pays.
At Solari Storage we review that bill before recommending anything, and we will tell you if the numbers say not to buy. We only work in California, which means we know the utilities, the rate plans and the permitting offices involved rather than generalising across twelve states. If you want to see the sizing logic first, our Powerwall 3 versus Lunar Energy comparison shows how we choose between systems.
Frequently Asked Questions
Can I keep my existing solar panels and just add a battery?
In most cases you can keep your existing panels and add a battery. Most California arrays accept an AC-coupled battery regardless of inverter brand or age, and adding storage to a paid-for array is usually the cheapest energy upgrade available. Solari Storage checks compatibility before quoting.
Will a battery eliminate my electricity bill?
No home battery eliminates a California electricity bill, and any company promising that is overselling. A battery shifts when you buy power rather than removing the need to buy it, and most households still draw from the grid on low-production days and through winter. The realistic outcome is a materially smaller bill.
Does a battery give me backup power during an outage?
Yes, a home battery provides backup power during an outage when the system is configured for it. How much of the house it runs and for how long depends on the capacity installed and which circuits are backed up, which is a design decision made when Solari Storage sizes the system.
Am I on NEM 2.0 or NEM 3.0?
Whether you are on NEM 2.0 or NEM 3.0 is determined by your interconnection date, not your installation date. California systems interconnected after April 2023 are on NEM 3.0. Your utility bill and interconnection paperwork confirm it, and Solari Storage can identify it from a recent bill.
Is it too late to install solar in California?
It is not too late to install solar in California, but the design has changed. Systems sized and sold on the assumption of full retail export credit no longer reflect the rules, so new California installations should be planned with storage in mind from the start rather than added later.
Need help now? Call Solari Storage on (916) 507-1626 or send us a recent utility bill and we will come back with real numbers for your house.
Key Takeaways
- NEM 3.0 applies to systems interconnected after April 2023 and cut export credit to roughly a quarter of its previous value.
- California utilities buy exported power at around eight cents and sell it back at peak for up to sixty-two.
- Panels alone cannot solve this, because production peaks at midday and the expensive hours start at sunset.
- Sixty-nine per cent of new California solar customers now install a battery alongside the array, per Wood Mackenzie and SEIA.
- Households with heavy evening use on steep time-of-use tariffs gain the most from storage.
- Send Solari Storage a recent bill here, and we will run your actual numbers.
