NEM 3.0 California Explained (2026 Guide)
California's NEM 3.0 cut solar export credits by roughly 75% versus the old NEM 2.0, which lengthened payback for panels-only systems but made solar-plus-battery the new winning strategy. Solar is still worth it in California thanks to very high electricity rates — but in 2026 you design around self-consumption and storage, not exporting to the grid.
What is NEM 3.0?
NEM 3.0 — officially California's Net Billing Tariff — is the rooftop-solar compensation policy that took effect in April 2023 for customers of the big three investor-owned utilities (PG&E, SCE and SDG&E). It replaced NEM 2.0 and fundamentally changed how much you're paid for the solar electricity you export to the grid.
Under the previous NEM 2.0, exported power earned nearly the full retail rate — close to 1:1. NEM 3.0 slashed export compensation to a value based on the grid's ‘avoided cost,’ which averages roughly 75% lower. This single change reshaped solar economics in the nation's biggest solar market and pushed the entire industry toward pairing solar with batteries.
What actually changed
The core change is the value of exported energy. Here's the contrast:
| Feature | NEM 2.0 | NEM 3.0 |
|---|---|---|
| Export credit | ~Full retail (near 1:1) | Avoided-cost (~75% lower) |
| Best strategy | Size to offset annual use | Self-consume + battery |
| Battery value | Optional | Central to economics |
| Export value timing | Flat-ish | Varies by hour (high in evening peak) |
Crucially, NEM 3.0 export rates vary by time of day and season — they're highest during the late-afternoon and evening peak, when the grid is stressed. That timing detail is the key to the new winning strategy, as we'll see.
Why California changed the rules
The change was driven by the so-called ‘cost shift’ argument. As millions of Californians installed solar under generous 1:1 net metering, utilities and regulators argued that solar owners were paying less toward grid maintenance, shifting those fixed costs onto non-solar customers — disproportionately lower-income households who couldn't afford panels.
Whether you find that argument persuasive or not, it's the official rationale, and it reflects a national trend: as rooftop solar scales up, full-retail net metering comes under pressure and regulators move toward net billing. California, as the largest market, is simply the leading edge of a shift other states are following — which is why understanding NEM 3.0 matters beyond California (see our net metering guide).
Why batteries are now central
NEM 3.0 turned batteries from a nice-to-have into the core of California solar economics. The logic is simple: if exporting your midday solar earns only a low avoided-cost rate, but importing power during the evening peak costs a high time-of-use rate, you make far more by storing your midday surplus and using it in the evening than by exporting it cheaply.
This is ‘solar arbitrage’ or ‘peak shaving,’ and it's where a battery pays for itself under NEM 3.0. A well-designed solar-plus-storage system charges the battery from the sun by day and discharges it during the expensive 4–9 p.m. peak, dramatically cutting what you buy from the grid. The export rate barely matters because you're consuming your own power. Our battery guide covers the economics in depth.
Impact on payback
For a panels-only system, NEM 3.0 lengthened payback compared with NEM 2.0 — often by a few years — because exported surplus is worth so much less. A system sized to overproduce and export now earns far less for that export. This is the headline many solar shoppers heard, and it's true as far as it goes.
But for a solar-plus-battery system designed for self-consumption, payback remains attractive, because California's very high electricity rates (often 30–45¢+/kWh) mean every kWh you self-consume or shift away from peak saves a lot. The math shifted from ‘export everything’ to ‘use and store your own,’ but the underlying value — avoiding expensive grid power — is still strong. Model your scenario with the Payback Calculator.
Is solar still worth it in California?
Yes — for most California homeowners, solar remains worth it under NEM 3.0, but the right design changed. California has among the highest electricity rates in the country and abundant sun, so the fundamental value of generating your own power is huge. What NEM 3.0 did was change how you capture that value: through self-consumption and storage rather than grid export.
The homeowners for whom NEM 3.0 weakened the case are those who wanted a cheap panels-only system to export surplus. For everyone willing to right-size and add a battery (or who uses lots of power in the evening), solar-plus-storage in California still delivers strong savings and valuable backup during the state's frequent outages and wildfire shutoffs. It's a different optimization, not the end of California solar.
How to design a system under NEM 3.0
The NEM 3.0-optimized approach differs from the old playbook:
- Right-size the panels to your usage rather than overbuilding to export — excess export earns little.
- Add a battery sized to shift your evening peak usage off the grid; this is where the savings now live.
- Shift flexible loads (EV charging, pool pumps, laundry) into daylight hours to self-consume directly.
- Choose a battery-ready hybrid inverter even if you add storage later.
A good California installer designs explicitly around NEM 3.0's time-of-day export values and your usage pattern. Be wary of any quote that ignores storage or assumes old 1:1 economics.
The battery cost question
The obvious objection: batteries add cost. In 2026 a home battery runs about $1,000 per usable kWh installed, or roughly $7,000–$9,000 for a typical 10–13 kWh unit after the 30% federal credit. That's real money, and it's why NEM 3.0 raised the upfront cost of an optimized system versus a cheap NEM 2.0 panels-only setup.
But California offers additional storage incentives (such as SGIP, with higher amounts for high-fire-risk and low-income households), and the battery earns its keep through daily peak-shaving plus outage protection in a state prone to shutoffs. For many households the combined federal and state support, plus the steep avoided peak costs, make the battery a sound investment rather than a burden — see the Battery Calculator.
Grandfathering: NEM 2.0 customers
If you installed solar under NEM 2.0 (before April 2023), you were generally grandfathered into those better terms for a set period — typically 20 years from your interconnection date. That's a valuable protection: your old 1:1-style export credits continue even as new customers are on NEM 3.0.
This grandfathering illustrates a broader lesson for solar shoppers everywhere: installing before a net-metering rollback can lock in better terms for years. If you're a California NEM 2.0 customer, understand your grandfathering end date before making changes (like a major system expansion) that could move you to NEM 3.0. When in doubt, confirm with your utility in writing.
What NEM 3.0 means for other states
California is the bellwether, and other states are watching. The national direction is clear: as rooftop solar grows, full-retail net metering gives way to net billing with time-of-use rates and storage incentives. States like Arizona, Nevada and others have already moved in this direction, and more will follow.
The practical lesson for homeowners anywhere: don't assume today's generous net metering will last, factor in the rising value of batteries, and consider installing while favorable terms exist (to grandfather them). NEM 3.0 isn't just a California story — it's a preview of where distributed solar compensation is heading nationally, which is why self-consumption and storage are becoming central to solar strategy everywhere.
How export rates vary by hour
A defining feature of NEM 3.0 is that export compensation is not a single number — it follows the grid's hourly avoided-cost values, published in advance. These rates are low during the sunny midday hours (when lots of solar is flooding the grid) and much higher during the late-afternoon and evening peak, when demand is high and solar is fading.
This time-varying structure is the entire logic behind pairing storage with solar under NEM 3.0. Exporting at midday earns little, but discharging a battery during the high-value evening window earns much more — or, better still, simply offsets the expensive grid power you'd otherwise buy then. Understanding that exports are worth most in the evening is the key to designing a system that performs well under the tariff, and it's why generic ‘export everything’ designs from the NEM 2.0 era no longer make sense.
Common NEM 3.0 misconceptions
Several myths circulate about NEM 3.0. The biggest is ‘solar is dead in California’ — false; solar remains valuable because of the state's very high rates, the strategy just shifted to self-consumption and storage. Another is ‘you get nothing for exports’ — you still get the avoided-cost value, which is meaningful during peak hours, just not the old near-retail rate.
A third misconception is that NEM 3.0 applies everywhere or retroactively — it's specific to California's three big investor-owned utilities and applies to new systems from April 2023; existing NEM 2.0 customers are grandfathered. Clearing up these myths matters because some homeowners wrongly abandoned solar plans that would still have saved them money under a properly designed solar-plus-storage system.
New customers vs existing NEM 2.0 owners
NEM 3.0 created two classes of California solar owner. New customers (interconnected after April 2023) are on the Net Billing Tariff and should design around self-consumption and storage. Existing NEM 2.0 owners keep their more generous near-retail export credits, typically for 20 years from interconnection — a valuable legacy benefit.
If you're an existing NEM 2.0 owner, the main caution is that significantly modifying or expanding your system could risk moving you onto NEM 3.0, so check with your utility before major changes. If you're a new customer, accept that the old economics are gone and optimize for the new ones. Either way, the lesson for solar shoppers nationally is the value of installing — and grandfathering favorable terms — before a policy tightens, a theme throughout our net metering guide.
NEM 3.0 in summary
If you're in California, model a solar-plus-storage system with the Payback Calculator and Battery Calculator, and read our net metering guide for the bigger picture.