NEM 3.0 Explained: A California Homeowner’s Guide to the Net Billing Tariff (2026)

What changed, what it means for your solar savings, and why battery storage is now the smartest move for Bay Area homeowners.

📋 Key Takeaway NEM 3.0: Officially California’s Net Billing Tariff (NBT) took effect April 15, 2023 and cut solar export credits by roughly 75%, from near the retail rate (~$0.30/kWh) to avoided-cost rates averaging ~$0.05–$0.08/kWh. It applies to all new PG&E, SCE, and SDG&E solar systems; existing systems stay grandfathered on NEM 2.0 for 20 years.

The energy you use inside your home is still worth full retail value, only exported surplus is affected. The bottom line for homeowners: pairing solar with battery storage is now essential, cutting payback to roughly 7–9 years versus 9–13 for solar alone, because a battery lets you use your power in the expensive evening hours instead of selling it cheap at midday.

If you’re a Bay Area homeowner researching solar in 2026, you’ve probably run into a confusing term: NEM 3.0.

You may have heard it makes solar “not worth it anymore.”

You may have heard the opposite. Somewhere in the noise, the actual answer got lost.

Here’s the honest version, with no spin: NEM 3.0 did reduce the value of the electricity your panels send back to the grid.

That’s real.

But it also made one thing crystal clear: the homeowners who win under the new rules are the ones who pair solar with battery storage.

The math has shifted, not disappeared.

At Dura-Foam Roofing & Solar Center, we’ve been helping Peninsula and East Bay homeowners make smart, long-term investments in their homes since 1981, long before “net metering” was a household term.

This guide breaks down exactly what NEM 3.0 is, how it’s different from the old rules, what it means for your savings, and how to design a system that still pays off.

What Is NEM 3.0? (The Short Version)

NEM 3.0 is California’s current solar billing policy.

Its official name is the Net Billing Tariff (NBT) — “NEM 3.0” is just the nickname that stuck. 

It went into effect on April 15, 2023, and it applies to all new solar systems connected to the grid in the territories of the three big investor-owned utilities: Pacific Gas & Electric (PG&E), Southern California Edison (SCE), and San Diego Gas & Electric (SDG&E). For most Bay Area homeowners, that means PG&E.

The core change is simple to state: the credit you earn for exporting excess solar power to the grid dropped dramatically … by roughly 75% compared to the previous policy.

here homeowners once earned close to the full retail electricity rate for what they sent back, they now earn a much lower “avoided cost” rate that changes by the hour.

Important: the solar energy you use inside your own home is just as valuable as ever.

Every kilowatt-hour your panels produce that you consume directly is a kilowatt-hour you don’t buy from PG&E at full price.

NEM 3.0 only changed what happens to the surplus you push back onto the grid. That single distinction is the key to understanding everything that follows.

NEM 2.0 vs. NEM 3.0: What Actually Changed

To understand why NEM 3.0 matters, it helps to see it side by side with the policy it replaced.

Here’s how the two compare for a typical homeowner:

Feature	NEM 2.0 (Old)	NEM 3.0 / Net Billing Tariff (Current)
Export credit value	Near full retail rate (~$0.30/kWh)	“Avoided cost” rate (~$0.05 to $0.08/kWh average)
How credits are calculated	Flat, predictable, time-of-use based	Varies by hour, day, and season
Billing cycle	Annual true-up	Monthly netting
Best system design	Solar panels alone often sufficient	Solar + battery storage
Value of self-consumption	Important	Essential

The biggest practical shift is in that first row.

Under the old rules, sending a kilowatt-hour to the grid was almost as good as using it yourself.

Under NEM 3.0, there’s a large gap: you might pay $0.30 to $0.45 to buy power from the grid in the evening, but only earn $0.05 to $0.08 for selling it at midday.

That gap is exactly the problem a battery is designed to solve.

How NEM 3.0 Export Rates Actually Work

Under the Net Billing Tariff, your exported energy is valued using California’s Avoided Cost Calculator (ACC).

In plain English, the ACC estimates what it would have cost the utility to buy that same electricity on the wholesale market at that exact moment, then pays you roughly that amount.

Because wholesale energy prices swing throughout the day, your export rate is different for every hour, every day of the week, and every season.

A few patterns hold true:

• Midday exports are worth the least. Midday exports are worth the least. 
• When the sun is high and every solar home is producing at once, the grid is flooded with cheap power. Exporting at noon often earns only a few cents per kilowatt-hour.
• Summer evening exports are worth the most. Summer evening exports are worth the most. 
• Late afternoon and early evening on hot days, when demand spikes and the sun is fading, export rates climb sharply, occasionally reaching several dollars per kWh during rare grid-stress events.
• This is why timing is everything. This is why timing is everything. 
• The value isn’t in producing solar; it’s in delivering energy when the grid actually needs it.

Here’s the catch for solar-only homeowners: your panels produce the most at midday (when exports are nearly worthless) and produce nothing in the evening (when both buying power is expensive and exporting would be most valuable).

Without storage, you’re forced to sell low and buy high.

A battery flips that script entirely.

Why Battery Storage Is Now Essential

If there’s one takeaway from this entire guide, it’s this: under NEM 3.0, a battery is no longer a luxury add-on.

It’s the component that makes the economics work.

Here’s the strategy a battery enables, often called “self-consumption” or “load-shifting”:

1. During the day, your panels charge your battery instead of dumping cheap power onto the grid.
2. In the evening, when PG&E rates are at their peak, your home draws from the battery instead of buying expensive grid power.
3. You avoid paying $0.30 to $0.45/kWh for evening electricity, which is worth far more than the $0.05 to $0.08/kWh you’d have earned by exporting that same energy at midday.

Industry analysis backs this up. Storing midday solar for evening use captures roughly four to five times more value than exporting it.

That’s why battery attachment rates in California jumped from around 11% of new solar installs before NEM 3.0 to well over half today. In many areas, 60 to 90% of new systems now include storage.

A bonus most homeowners love: backup power. A battery doesn’t just save money.

It keeps your lights, refrigerator, and Wi-Fi running during PG&E outages and Public Safety Power Shutoffs. 

For Bay Area homeowners who’ve sat through multi-day shutoffs, that peace of mind is often worth as much as the bill savings.

At Dura-Foam, we design integrated solar-plus-storage systems using equipment we trust, including Tesla Powerwall, FranklinWH, Enphase, Qcells, and SolarEdge.

The right battery for your home depends on your usage, your roof, and your backup priorities, which is exactly the kind of thing worth a real conversation rather than a one-size-fits-all quote.

Is Solar Still Worth It in California Under NEM 3.0?

Short answer: yes, especially with a battery, and especially in the Bay Area.

Here’s why the headlines that declare solar “dead” miss the bigger picture.

California still has some of the highest electricity rates in the country, and PG&E’s rates have climbed steadily.

The more you pay per kilowatt-hour, the more every unit of self-consumed solar is worth to you.

High utility rates are precisely what keeps California solar attractive even after the export-credit cut.

Real-world payback periods under NEM 3.0 generally look like this:

System Type	Typical Payback Period (CA, 2026)
Solar only	Roughly 9 to 13 years
Solar + battery storage	Roughly 7 to 9 years (faster with incentives)

Notice the counterintuitive result: under NEM 3.0, adding a battery often produces a faster payback than going solar-only, because the battery lets you capture the full retail value of your production instead of selling it cheap.

Combined with available incentives (below), well-designed solar-plus-storage systems in California still deliver returns that are hard to match anywhere else in the country.

Incentives That Still Make Solar + Storage Pay Off

NEM 3.0 reduced one benefit, but several major incentives remain in place to improve your numbers:

• Federal solar tax credit: Federal solar tax credit: 
• a significant credit on the cost of your solar-plus-storage system. Federal incentives have been subject to legislative change, so the available amount and deadlines should be confirmed for your specific install timeline.
• SGIP (Self-Generation Incentive Program): SGIP (Self-Generation Incentive Program): 
• California’s battery storage rebate. Amounts vary by eligibility tier, and qualifying low-income, high-fire-risk, or resiliency-area households can receive substantially larger rebates. Stacking SGIP with the federal credit can meaningfully shorten your payback period.
• ACC Plus adders: ACC Plus adders: 
• additional export compensation available through 2028 that boosts the value of energy you send to the grid. These adders decrease each year, which is one reason acting sooner generally beats waiting.

A note on accuracy: incentive amounts, eligibility rules, and deadlines change frequently.

The figures here reflect general 2026 conditions, but the only way to know what your home qualifies for is a personalized assessment.

We’ll walk you through exactly which programs apply to your address and timeline.

Already Have Solar? What “Grandfathering” Means for You

Good news if your system is already running: NEM 3.0 does not apply to you retroactively.

If your solar system received Permission to Operate before April 15, 2023, you remain on your original net metering agreement, either NEM 1.0 or NEM 2.0, for 20 years from your interconnection date. 

This is called “grandfathering.”

That’s a valuable position to protect.

A few things existing solar owners should know:

• Adding a battery usually doesn’t affect your grandfathered status, Adding a battery usually doesn’t affect your grandfathered status, 
• as long as the change doesn’t significantly increase your system size. This means you can add storage, for backup power and peak-rate savings, while keeping your favorable export rates.
• Major system expansions can trigger a switch to NEM 3.0, Major system expansions can trigger a switch to NEM 3.0, 
• so if you’re planning to substantially enlarge an older system, it’s worth understanding the tradeoffs first.
• Your roof matters here too. Your roof matters here too. 
• If your existing solar sits on an aging roof, addressing the roof before it fails can save the considerable cost of removing and reinstalling panels later, a specialty area for an integrated roof-and-solar company like ours.

A Note for Bay Area & Eichler Homeowners

Solar economics aren’t only about policy. They’re about your specific roof.

The Bay Area’s housing stock includes a large number of flat and low-slope roofs, including the region’s iconic Eichler homes.

These roofs present unique considerations for solar mounting, waterproofing, and long-term performance that a general installer may overlook.

This is where the integration matters. Putting solar on a roof that’s near the end of its life means paying twice when the roof eventually needs replacement.

Dura-Foam specializes in both durable foam roofing systems and solar installation, so your roof and your energy system are designed to work together and last together.

This is the kind of long-term thinking that protects your investment for decades, not just until the next leak.

NEM 3.0 FAQ

Get a Straight Answer for Your Home

NEM 3.0 didn’t end California solar. It just rewarded smarter system design.

The right setup for your home depends on your roof, your usage, your backup priorities, and the incentives you qualify for.

That’s not something a generic online calculator can tell you.

Dura-Foam Roofing & Solar Center has helped Peninsula and East Bay homeowners protect and improve their homes since 1981.

We’ll assess your roof and energy needs together and show you exactly what solar-plus-storage looks like for your home under today’s rules, with no pressure and no jargon.

Schedule your free, no-obligation consultation today, and find out what your roof can really do.

This guide is for educational purposes. Policy details, rates, and incentive amounts under California’s Net Billing Tariff change over time and vary by utility, location, and household. Figures cited reflect general 2026 conditions and should be confirmed for your specific situation.