California NEM 3.0 Explained: Is Solar Still Worth It for New Customers in 2026?

If you've been researching solar in California, you've probably run into the term "NEM 3.0" and a lot of strong opinions attached to it. The honest answer to "is it still worth it?" is the one nobody likes at first: it depends — on your utility, your rate plan, the date you connected (or plan to connect), how much energy you use in the evening, and whether you add a battery.

This guide walks through what actually changed, in plain English, and points out exactly which facts you'll need to confirm for your situation rather than trust from a headline.

What changed: from net metering to net billing

For years, California's rooftop solar ran on net energy metering (NEM). The short version: the grid acted almost like a one-to-one bank. Power you exported during the day offset power you pulled at night at close to retail value.

That structure changed. Under California's current rules, customers who applied for interconnection on or after April 15, 2023 take service on the newer Net Billing Tariff (NBT) — often called "NEM 3.0" in everyday conversation — and the older legacy net-metering tariffs are closed to new enrollments [1]. If you enrolled under a legacy NEM tariff before that shift, your terms generally still follow the plan you signed up under; if you're going solar now, you're almost certainly looking at net billing [1].

That single distinction — legacy NEM versus net billing — is the first thing to pin down about your own project, because it changes how exported energy is valued.

How net billing values your exported energy

Here's the practical difference. Under net billing, the credit you earn for energy you send back to the grid is generally lower than the retail rate you pay to buy it — but the value isn't flat. It varies by time, and it can actually be higher during certain late-summer evening hours when the grid needs power most [1].

Why does that matter for your decision? Because it shifts the goal. Under old net metering, exporting midday solar was rewarded almost like cash in the bank. Under net billing, the more valuable move is often using your own solar when you produce it, and shifting some usage — or export — into the hours when it's worth more. That's exactly the behavior a battery makes possible: it lets you store daytime solar and use (or send back) that energy later, changing when your energy shows up [1].

Notice what this does not say: it does not promise a battery will pay for itself, or that any specific rate applies to you. The tariff details and the exact export values depend on your utility and rate plan, and you should confirm them for your address [1].

Where a battery fits — and where it doesn't

A battery is worth considering when one or more of these is true for you:

• Your evening usage is high. If you use a lot of power after the sun goes down, storing your own solar to cover those hours can matter more under net billing than it did under legacy NEM.
• You want backup during outages. This is a resilience benefit that has nothing to do with your rate plan — it's about keeping specific circuits running when the grid is down.
• Your export credits are low midday. If daytime export value is modest, keeping that energy for yourself can be more useful than selling it back.

A battery is not an automatic win. Usable capacity (kWh), power rating (kW), which loads you back up, install price, and financing all change the picture — and none of that can be judged from a rate plan alone. Treat "add a battery" as a question to price and compare, not a foregone conclusion.

Incentives and rebates: check status, don't assume

Two incentive topics come up constantly. Both require you to check current status rather than trust a general claim.

California's SGIP (Self-Generation Incentive Program). SGIP can offset battery storage costs for some customers, and the state identifies budgets aimed at residential solar-and-storage — including an equity-focused budget. But whether a given SGIP budget is open or closed, and whether you qualify, changes over time and by program; the CPUC explicitly directs people to check the current SGIP status and handbook rather than assume availability [2]. SGIP is not a universal rebate that every homeowner can claim, and eligibility (including income-qualified paths) has specific rules [2]. Confirm the current budget status before you factor any SGIP amount into your math.

The federal tax credit. This is where a lot of outdated advice is circulating, so read carefully. The IRS states that the Residential Clean Energy Credit equals 30% of the cost of new, qualified clean energy property installed from 2022 through December 31, 2025 [3]. Based on that IRS page, you should not assume a 30% federal residential clean-energy credit for equipment placed in service after December 31, 2025. If you're planning a 2026 installation, do not build your budget around that credit — check the current IRS instructions or ask a qualified tax professional about what, if anything, applies to your tax year and situation [3]. This article is educational and is not tax advice.

A pre-quote checklist you can actually use

Before you sign anything, gather these. They're the inputs that turn "it depends" into a real, personalized answer:

1. Your utility and rate plan — and whether you're on a time-of-use rate.
2. Your NEM/NBT status — legacy net metering or the Net Billing Tariff [1].
3. Your interconnection or permission-to-operate date (or expected date) — this drives which rules apply [1].
4. Annual usage and your evening load — how much you use, and when.
5. Battery specs, if quoted — usable kWh and power rating (kW).
6. Backup loads — which circuits you actually want running in an outage.
7. Current incentive status — SGIP budget status and eligibility [2]; tax-credit eligibility for your placed-in-service date [3].
8. Price and financing — the quoted price, terms, and total cost over time.

Then compare annual bill impact and backup value as ranges — not guaranteed savings. Anyone promising a single guaranteed number is skipping the parts that actually depend on you.

Where that leaves you

None of this resolves into a single right answer, and that's really the point — the math bends around your utility, your rate plan, your evening habits, and the dates on your paperwork. The pre-quote checklist above is just a way to gather those inputs so "it depends" turns into something you can actually weigh.

A couple of tools can help with that groundwork if you want them. If you're still in the exploring stage and don't have numbers yet, EnergyScout's free assessment at energyscout.org can turn a ZIP or address into a localized starting point — a first read on solar, battery, and incentive context for your area. Connecting with an installer stays optional; plenty of people use it just to understand their own situation and leave it there.

If you already have a quote in hand, Is It Fair offers a quick second look before you sign — a way to sanity-check the assumptions, line items, and price sitting in front of you. It doesn't promise guaranteed savings, and it won't hand your details to an installer.

Whichever fits you, keep the incentive caveats close. SGIP budgets open and close by program, and eligibility varies [2]. And the federal picture hinges on when your equipment is placed in service: based on current IRS guidance, don't assume a 30% residential clean-energy credit for property placed in service after December 31, 2025 [3] — check the current IRS instructions or a qualified tax professional for your own tax year. This is educational information, not tax advice.

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Sources

[1] https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/demand-side-management/customer-generation/net-energy-metering-and-net-billing [2] https://www.cpuc.ca.gov/industries-and-topics/electrical-energy/demand-side-management/self-generation-incentive-program [3] https://www.irs.gov/credits-deductions/residential-clean-energy-credit