Imagine two neighbors who installed identical solar systems a few years apart. Their panels produce the same power on the same sunny afternoons, yet their bills look nothing alike. Neither of them made a mistake. They simply signed up under different export rules.
Net metering changes affect your solar savings by lowering what you earn for the power you send back to the grid. Under classic net metering, each exported kilowatt-hour offsets a kilowatt-hour you buy later at roughly the retail rate. Under the newer "net billing" designs now spreading across the U.S., exports are usually credited at a lower, cost-based rate, and the credit may be calculated hourly or instantly instead of monthly. The result: savings depend far more on when you use your solar power and less on how much you export.
Below you’ll find how the two systems differ, which type of household feels the change most, a one-question tool to point you to the right section, and the questions worth asking before you sign anything.
Key takeaways
- Net metering usually credits exports at about the retail rate. Net billing credits them at a lower rate, so exported power is worth less than power you use directly.
- Rules vary by state and often by utility. A national headline may not describe your bill.
- Existing customers are often protected for a set period, but the length and terms differ. Confirm yours in writing.
- Self-consumption, battery storage, and the timing of your usage matter more under net billing.
- Any savings figure from a quote should name the export rate it assumes.
Try it: which situation sounds like yours?
Pick the statement that sounds closest to your household. The tool will point you to the section of this article that fits best. It doesn’t calculate savings or give personal advice.
Which sounds most like you?
Educational pointer only. It does not estimate your savings.
Net metering vs. net billing in plain terms
Most people try to judge solar by panel size and price. That works until the billing rules change underneath the math. Three terms are worth knowing first.
Net metering
Your meter runs backward, in effect. Power you send to the grid earns a credit, usually valued near the retail rate, and credits typically roll against your usage over a billing period. The grid works like a bank: you deposit at noon and withdraw at night at nearly the same value.
Net billing
Imports and exports are priced separately. Power you buy is charged at your retail rate. Power you export is credited at a different, generally lower rate, often tied to what the utility avoids paying elsewhere. Netting intervals also tend to be shorter, such as hourly or instantaneous, rather than monthly, according to the NC Clean Energy Technology Center’s tracking of state policy.
Illustrative example (not real rates)
Suppose your home exports 10 kWh at midday and imports 10 kWh in the evening. For illustration only, assume retail power costs $0.30 per kWh and the export credit is $0.08 per kWh.
- Under 1:1 net metering, the 10 kWh export offsets the evening purchase: about $3.00 of value.
- Under net billing, the same export is credited at about $0.80, while the evening purchase still costs $3.00. The gap is $2.20 for that one cycle.
Real rates differ widely by utility. Estimate only.
| Feature | Net metering | Net billing |
|---|---|---|
| Export value | Near retail rate | Lower, cost-based rate |
| Netting period | Often monthly | Often hourly or instantaneous |
| Best for | Households with large midday exports | Households that use solar power as it’s made |
| Role of batteries | Optional | Often much more valuable |
Why the rules keep changing
Utilities and regulators argue that full retail credit for exports can shift grid costs onto customers without solar, since part of a retail rate pays for poles, wires, and service rather than energy alone. Solar advocates counter that exports also deliver value to the grid and that the shift undercuts customers who already invested. Research on the question is mixed: a 2025 NREL study, as summarized by one installer, found the bill impact on non-solar customers was under $1 a month where solar adoption was low, and many states with higher adoption kept net metering anyway. Treat that as one input, not a verdict.
What is clear is the direction. The NC Clean Energy Technology Center’s tracking shows net metering the most frequent subject of state solar policy action, with utilities continuing to move toward net billing. California changed its rules with the program commonly called NEM 3.0, and trade press reported that Idaho’s regulators voted in late 2025 to move residential customers to net billing. Other states, such as Maryland, Virginia, and Connecticut, have been working through successor programs, though details and timing are still shifting. Check your state regulator’s site for the current status.
One more factor changed the picture: the federal residential solar tax credit (Section 25D) is no longer available for systems placed in service after 2025, so export value now carries more weight in the payback math. Confirm current federal and state incentives with an official source or a tax professional.
Three illustrative households
These are made-up scenarios to show patterns. They are not real customers, and the effects described are directional, not measured.
Household A: home all day
Someone works from home, runs the air conditioner and appliances at noon, and uses much of the solar output directly. Fewer kilowatt-hours get exported, so lower export credits matter less. This household is usually the least affected by a move to net billing.
Household B: out all day, busy evenings
The panels produce plenty at noon while no one is home, and the household uses power from late afternoon onward. Most solar output is exported at the low rate, then bought back at the high rate. This is the pattern that net billing penalizes most. Options include shifting flexible loads (laundry, dishwasher, EV charging) toward daylight, sizing the system closer to daytime use, or evaluating a battery.
Household C: already has solar under older rules
A household with an existing system sees a headline about new rules and worries. Often the new terms apply to new interconnections, while existing customers keep their credit structure for a defined period. The next section explains what to verify.
Are existing systems protected?
Often, yes, but not automatically and not forever. Many states and utilities let customers who interconnected before a cutoff date keep their old terms, commonly called grandfathering. Examples cited in industry guides include periods such as 20 years from interconnection in California, but the length and the triggering event vary by state and utility.
- Know your date. Protection usually depends on when your system was interconnected or approved, not when you signed the contract.
- Know the rule that protects you. Ask your utility or regulator whether the protection is a fixed term, tied to the system, or tied to the account.
- Watch for changes that aren’t net metering. General rate increases, new fixed charges, or time-of-use rates can reduce savings even when your export credit stays the same.
- Be careful with expansions or moves. Adding panels or changing owners may affect eligibility in some places. Ask before you change anything.
Common mistakes when comparing quotes
- Accepting a savings number without the export rate behind it. A projection built on full retail credit can overstate results in a net billing area.
- Sizing the system to total annual usage. Under net billing, a system sized to match daytime demand may outperform one sized to cover the whole year.
- Assuming today’s rules will last. Policies get revised. Ask what protection you have if they do.
- Treating a battery as automatic. Storage can raise the value of solar under net billing, but it adds cost, so compare the payback with and without it.
- Rushing because of a deadline. A real cutoff date can matter, but verify it with the utility or regulator rather than relying on a sales message alone.
Questions to ask before you sign
- Which billing structure applies to my address, and what is the export rate or credit method?
- Is the netting monthly, hourly, or instantaneous?
- What is the date or event that determines grandfathering, and for how long does it last?
- Does the projection assume the current export credit, and what does it look like at a lower one?
- What does the estimate look like with a smaller system, and with a battery?
- What other charges apply: fixed fees, minimum bills, or time-of-use pricing?
This is general information, not financial, tax, or legal advice. For a decision about your own home, check your utility’s tariff and talk with a qualified professional.
Quick answers
Will net metering disappear everywhere?
Nobody can say for certain. Several states have already moved to net billing, others still offer full credit, and the trend has been toward lower export compensation. Your own state’s rules are what count.
Is solar still worth it under net billing?
It can be, but the case depends more on how much of your solar power you use yourself, your electricity rates, system cost, and available incentives. A quote that shows results at your actual export rate is the best starting point.
Where do I find my current rules?
Your state public utility commission and your utility’s published solar tariff are the most reliable sources. Policy trackers such as the NC Clean Energy Technology Center’s “50 States of Solar” can give a broader view, though they may lag behind recent decisions.
Back to the two neighbors
The neighbors from the start had identical panels and different bills because their export rules, and probably their daily routines, differed. That is the main lesson: under net metering, what you send out matters; under net billing, what you use as it’s made matters more. Before you buy or reevaluate, find out which rules apply to you, then see how your quote holds up at the actual export rate. A good next step is to write down your own top three questions from the list above and take them to your installer or utility.