If you are researching solar in California right now, you have almost certainly run into the term NEM 3.0, usually attached to a warning that solar is not the deal it used to be. The truth is more useful than the headline. Net metering did change, and the change does shift how a rooftop system pays you back, but it does not erase the case for going solar. It rewrites it. Understanding NEM 3.0 solar in California comes down to grasping one idea: the state now cares a great deal about when your panels send power to the grid, not just how much. This guide explains what net metering is, what actually changed, and how homeowners are getting strong returns under the new rules.
What net metering is and why it matters
Net metering is the billing arrangement that decides what your utility pays you for the solar power you do not use on-site. Your panels often produce more than your home needs in the middle of the day; that surplus flows back to the grid, and net metering sets the credit you earn for it. That credit is the quiet engine behind most solar savings, which is why a change to the rules gets so much attention.
How net metering worked under NEM 2.0
Under the previous rules, known as NEM 2.0, the arrangement was simple and generous. Every kilowatt-hour your system exported earned a credit worth roughly the full retail rate, close to what you would have paid to buy that same power back later. Send a unit to the grid at noon, pull a unit back at night, and the two nearly cancel out. The grid effectively acted as a free battery, and that one-for-one math made solar-only systems pencil out quickly.
The shift to NEM 3.0
NEM 3.0, more accurately called the Net Billing Tariff, took effect for new California solar customers in 2023 and applies to systems interconnected after that point. It keeps the basic idea that you get credit for exports, but it changes the value of those credits dramatically. Instead of paying retail rate for the power your panels send back, the utility now pays much closer to its own wholesale cost of buying that electricity. That single change is the heart of everything people mean when they talk about NEM 3.0.
What actually changed under net billing
The move from NEM 2.0 to NEM 3.0 is best understood as a shift from paying you for energy to paying you for energy at a specific moment. The volume of power you export still counts, but its worth now swings with the hour and the season. This is the part that trips up homeowners reading old advice written for the previous rules.
Export credits at avoided-cost rates
Under NEM 3.0, your exports are valued at what the utility calls avoided-cost rates, the amount it would have spent to source that same electricity from the wider market at that moment. These rates are published in advance, and they vary hour by hour across the year. For most daytime hours, they land well below the retail price you pay to draw power at night, which is why a unit sent to the grid at noon no longer buys back a full unit after sunset.
Why the timing of exports now matters
Because export value follows the market, the clock and the calendar drive your credits. Midday, when rooftops across the state are all producing at once, is exactly when grid power is cheapest, and your export credit is lowest. The high-value windows come in the early evening, when the sun drops but demand peaks and wholesale prices climb. A NEM 3.0 system that simply dumps its midday surplus to the grid captures the least valuable hours, while one that can hold power and deliver it in the evening captures the most valuable ones.
What NEM 3.0 means for your solar savings
None of this means the panels stopped working. It means the strategy that maximizes savings has moved. Under NEM 2.0, the winning move was to export freely and settle up at retail. Under NEM 3.0, you are to use your own solar power directly and export the leftovers thoughtfully.
Solar-only systems under NEM 3.0
A panels-only system still saves money under NEM 3.0, because every kilowatt-hour you consume the instant your roof makes it is a kilowatt-hour you never buy at retail. That direct offset is untouched by the rule change and remains valuable, especially as utility prices rise. The part that shrank is the credit for surplus you cannot use on the spot, so a solar-only home in 2026 sees a longer payback than the same home would have seen under the old tariff, though still a real one.
The midday value gap
The core challenge NEM 3.0 creates is a mismatch of timing. Your roof produces most heavily around midday, but a typical household uses most of its power in the morning and evening. Under the old rules, that gap did not matter because the grid banked your noon surplus at full value. Under net billing, it is exactly where value leaks away, since the surplus is credited at low midday rates while your evening usage is billed at high retail rates. Closing that gap is the whole game.
Why a battery changes the math under NEM 3.0
The single most important response to NEM 3.0 is home energy storage. A battery lets you keep your low-value midday surplus instead of selling it cheaply, then spend it in the evening when buying from the grid is most expensive. In effect, the battery does the job the grid used to do for free under NEM 2.0, and that is why storage moved from a nice-to-have to the center of a well-designed system.
Storing midday production for evening use
With a battery in the mix, the surplus your panels make at noon charges the pack instead of flowing to the grid at a low credit. When evening arrives and rates peak, you draw from that stored solar rather than buying expensive grid power. This time-shift is precisely what recovers the savings NEM 3.0 pulled out of straight export, and it is why pairing a battery with the array is now standard advice for new California systems. If you are weighing storage on an existing setup, our guide to adding a battery to an existing solar system walks through the retrofit side.
More than economics
Storage earns its place on bill savings alone under NEM 3.0, but it also buys something the old export model never did. During a grid outage or a public safety power shutoff, a battery keeps essential circuits running while grid-tied panels alone would shut down for safety. If resilience matters to your household, a battery also keeps the lights on when the utility cannot, which is a benefit worth weighing alongside the export math.
Is solar still worth it under NEM 3.0?
Short answer, yes, for most California homes, though the reasons have shifted from the old export windfall to a mix of self-consumption and rising grid prices. The case is different, not weaker, and it holds up well once you design for the new rules instead of the old ones.
Rising utility rates do the heavy lifting
The more grid electricity costs, the more each unit of self-consumed solar is worth, and California rates have kept climbing. Because electric bills keep climbing across California, the power you produce and use yourself offsets an ever-more-expensive alternative. NEM 3.0 lowered the value of exports, but the steady rise in retail rates keeps lifting the value of everything you consume on site, which is the larger pool of savings for a well-designed system.
Sizing and using the system for self-consumption
Designing for NEM 3.0 means matching production to how your home actually uses power rather than maximizing raw export. It helps to size a system for self-consumption and, where possible, to shift heavy usage into daylight hours so more of your solar is used the moment it is made. Running the dishwasher, pool pump, or EV charger while the sun is up turns low-value would-be exports into full-value avoided purchases, and it stacks neatly with a battery for the hours you cannot shift.
Where high-efficiency Maxeon panels fit
Under a tariff that rewards using every available kilowatt-hour, the productivity of the panels themselves matters more than it did when the grid banked your surplus at full price. Getting the most energy out of a limited roof directly raises how much solar you can self-consume and store, which is exactly the value NEM 3.0 concentrates. High-efficiency modules squeeze more daily production from the same square footage, giving a battery more to store and a household more to use before any electricity is bought back at retail.
Durability matters just as much because NEM 3.0 stretches the payback period, and you want the hardware earning for every year of it. Maxeon panels are built around a back-contact cell and a rugged frame designed to keep producing for decades, and because they are among the most reliable solar panels in independent field data, the longer NEM 3.0 timeline is spent on hardware unlikely to falter. For homeowners comparing options, the guide to Maxeon panel models and pricing shows how the efficiency tiers translate into real roof output, the number that drives self-consumption under the new rules.
If you already have solar
Everything above is written for homeowners going solar now, under NEM 3.0. If your system was interconnected before the switch, you are almost certainly grandfathered on the older, more generous terms, typically for a set number of years from your original interconnection date. Grandfathering is valuable and worth protecting, especially the material-modification limits that govern what you can change without losing it. If you are already locked into NEM 2.0 and thinking about adding storage, the rules for doing that without jeopardizing your legacy status are their own topic, and it is worth getting right before you sign anything.
Making NEM 3.0 work for your home
NEM 3.0 did not end the case for California solar; it changed the design that wins. The old playbook of exporting freely and settling at retail gave way to a new one built on using your own power, storing the surplus, and letting steadily rising grid rates do the rest. A system sized for self-consumption, paired with a battery, and built on efficient, durable panels captures the value the new tariff concentrates in the evening hours and in every kilowatt-hour you use on site. The details depend on your roof, your usage pattern, and your utility, so the smartest first step is a design built for your actual home. To see what a NEM 3.0-ready system looks like for your household, you can talk with the US Power team and get numbers grounded in your real usage rather than a rule of thumb.
Frequently asked questions
What is NEM 3.0 in simple terms?
NEM 3.0, officially the Net Billing Tariff, is California’s current net metering rule for new solar customers. It still credits you for the surplus power your panels send to the grid, but it values that surplus at the utility’s avoided cost rather than the full retail rate, so the timing of your exports now shapes your savings far more than it used to.
How is NEM 3.0 different from NEM 2.0?
Under NEM 2.0, exported power earned close to the full retail rate, so a unit sent at noon roughly paid for a unit pulled back at night. Under NEM 3.0, exports are credited at lower, market-based rates that change by the hour, which shrinks the value of surplus you send to the grid and rewards using or storing your own solar instead.
Do I need a battery to go solar under NEM 3.0?
You do not strictly need one, and a panels-only system still saves money by offsetting the power you use as it is produced. A battery, though, is what recovers most of the value NEM 3.0 removed from straight export, because it lets you store cheap midday production and use it during expensive evening hours, which is why storage is now standard advice for new systems.
Is solar still worth it in California under NEM 3.0?
For most homes, yes. The payback is longer than it was under NEM 2.0, but rising utility rates keep raising the value of every kilowatt-hour you produce and use yourself, and a system designed for self-consumption and paired with a battery still delivers strong long-term savings.
Does NEM 3.0 affect my existing solar system?
Generally no. If your system was interconnected before NEM 3.0 took effect, you are typically grandfathered onto the earlier terms for a set period from your interconnection date. Major changes to the system can put that status at risk, so check the rules carefully before modifying an older array.
When is exported solar worth the most under NEM 3.0?
Export value follows wholesale market prices, so it is lowest around midday when rooftops across the state are all producing, and highest in the early evening when the sun fades but demand and prices peak. This is why a battery that shifts your surplus into the evening captures far more value than sending it to the grid at noon.