Before any homeowner asks "how many panels do I need?", there is a quieter question that decides whether the answer pays back: what will the utility actually pay me for the power I send them? The answer lives in a one-word billing mechanism called net metering, and it is the single most important piece of solar policy you will ever read. In some markets it credits your exports at the full retail electricity rate; in others it pays a fraction of that. The difference is thousands of dollars over a system's life, and it is written into your utility's tariff.
This guide explains the mechanism from the meter outward: how the bidirectional meter works, how monthly netting produces bill credits, what the three competing schemes (net metering, net billing, feed-in tariff) actually mean, how the rules split by region in 2026, and — most practically — how the compensation model should change your system size and your battery decision.
What net metering actually is
Net metering is a utility billing arrangement: when your solar panels produce more electricity than your home is using at that moment, the surplus flows onto the local grid through a bidirectional (net) meter, and the utility credits your account for every exported kilowatt-hour. Those credits then offset the electricity you import at night, on cloudy days, and in winter. At the end of the billing period, you are billed for the net — imports minus exports — which is where the name comes from.
Think of it as a virtual battery run by your utility. You cannot see the energy you export, but the meter records it, the utility banks it in your account, and you withdraw it later against your next bill. Unlike a physical battery, there is no round-trip efficiency loss and no capacity limit — which is why, where full retail net metering exists, it remains the most valuable solar incentive on the market.
How it works, step by step
Walk the energy through a single sunny afternoon. Your panels produce 4 kW, your home draws 1 kW for the fridge and the router, so 3 kW leaves through the bidirectional meter onto the street. The meter spins (or counts, if it is digital) backwards for those three kilowatts. At sunset the panels go quiet, the house pulls 1 kW from the grid, and the meter runs forward again. At the end of the month, the utility subtracts total exports from total imports:
Net kWh billed = total imported kWh − total exported kWh
If the result is positive, you pay for the difference. If it is negative, you have banked a credit. Under true net metering that credit is worth the full retail rate per kWh; under net billing it is worth the lower export (avoided-cost) rate — and the number below is the one that decides your real savings:
| Term | What it means | Why it matters to you |
|---|---|---|
| Imported kWh | Energy drawn from the grid when solar isn't enough | What you pay for — at your full retail rate |
| Exported kWh | Surplus solar sent to the grid midday | What earns credits — at retail or at the reduced export rate |
| Export (credit) rate | The price per exported kWh your program pays | The single number that sets your payback period |
| True-up | The periodic (often annual) settlement of leftover credits | Unused credits may be paid out, rolled over, or zeroed — check your program |
| Fixed charges | Meter fees, taxes, connection fees on every bill | Solar never removes these — they stay on even a zero-consumption bill |
The fixed charges row deserves emphasis: even a home that exports more than it imports still pays the monthly connection and meter fees. A realistic solar bill under net metering is never zero — it is your energy charges reduced toward zero plus the fixed items. Expecting a literal $0.00 bill every month is the most common misconception we see, and it distorts payback expectations.
Net metering vs net billing vs feed-in tariff
Three schemes coexist worldwide, and marketing material often blurs them. The difference is simply which rate your exports are paid at:
| Scheme | Export rate | Best-fit system design |
|---|---|---|
| Net metering (1:1) | Full retail rate, same as what you pay to import | Size to annual consumption; modest oversizing is fine |
| Net billing | Reduced avoided-cost rate (often 3–8 cents/kWh vs 20–35 cents retail) | Right-size to daytime load; battery becomes essential |
| Feed-in tariff (FiT) | A separate fixed tariff for all exported energy, sometimes time-varying | Production maximization can outweigh pure self-consumption |
The practical reading rule: if your tariff calls your export payment a credit at the retail rate, you have net metering. If it quotes an avoided-cost or export compensation figure far below retail — like California's NEM 3.0, which cut export compensation by roughly 75% compared to its predecessor — you have net billing, and your savings case must be built on self-consumption, not on selling to the grid.
How net metering shows up on your bill
Under net metering your monthly statement still has the same skeleton as before: fixed charges first, then the energy section. The energy section now carries an import figure, an export figure, and a net figure. Months with surplus production show a negative net balance — that is your credit building. Watch for three details when you read it.
First, the credit rate applied: some utilities apply your full tariff including tiers, others apply only the lowest tier to credits. Second, the measurement period: most programs net monthly, but an increasing number of markets (including parts of California) net every hour or fifteen minutes, which is harsher on midday-only production. Third, the true-up terms: what happens at the end of the credit year — cash payout, carry-forward, or forfeiture — sets your ceiling on what the system can ever be worth.
The electricity bill guide on this site walks through extracting the kWh figures these calculations need; this guide supplies the policy layer on top of them.
Net metering around the world in 2026
The landscape splits into three tiers, and the tier your market sits in decides your whole design philosophy. In the United States, roughly 38 states plus D.C. maintain some form of net metering or net billing, but the era of uniform 1:1 retail credits is fracturing. States like New Jersey, Massachusetts, New York, Maryland, Connecticut, Vermont and Maine still offer genuine full-retail net metering (often grandfathered for twenty years), while California, Nevada, Arizona, Arkansas and Indiana have moved to net billing with sharply reduced export rates, and a couple of states have no statewide program at all. The US resource to check is DSIRE, the national database of state incentive policies.
In Europe, the direction has largely been the opposite: countries are shifting from net-metering-style schemes toward dedicated prosumer feed-in tariffs and market-based compensation, with Germany's feed-in model being the reference point. In Australia, solar owners receive state-based solar feed-in tariffs for exports rather than true net metering, so the export rate varies by retailer and state. Across Asia, both models coexist — Malaysia runs a Net Energy Metering scheme, Indonesia has net metering for capped system sizes, Thailand operates NEM, net-billing and buy-all options side by side, and Singapore compensates rooftop exports under its licensing framework.
| Region | Dominant scheme | 2026 direction |
|---|---|---|
| US (retail-rate states) | 1:1 net metering, 20-year grandfathering common | Stable but under review in several states |
| US (transition states) | Net billing at avoided-cost rates | Export rates declining; battery adoption rising |
| Europe | Feed-in tariffs and prosumer compensation | Moving toward market-based export pricing |
| Australia | State-based feed-in tariffs via retailers | FiT rates modest; self-consumption emphasis |
| Asia | Mixed: NEM, net billing, buy-all | Expanding rapidly with size caps and licensing |
How net metering changes your system size
The compensation model is a design input, not fine print. Under full retail net metering, every exported kilowatt-hour earns what you would have paid for it, so a system sized to your annual consumption — with some headroom — maximizes savings, and going slightly over is rarely punished. Under net billing the calculus inverts: exported energy is worth a fraction of imported energy, so the goal becomes matching production to your own daytime load. In those markets a smaller array plus a battery routinely beats a larger array alone, because a stored kilowatt-hour used at the evening peak is worth three to five times an exported one.
That is why the panel calculator step should always be preceded by the policy question: find your export rate first, then size. The ROI calculator then converts those numbers into a payback — and paybacks swing by years depending on which side of the net-metering line your utility sits. If you are on the fence between configurations, our grid-tied vs off-grid vs hybrid guide maps the three architectures against exactly this kind of tariff reality.
The battery question, honestly
Under 1:1 net metering, a battery is largely optional: the grid is your free, lossless storage, and the battery only buys backup power and independence. Under net billing or time-of-use tariffs, the battery changes the economics — storing midday surplus for the expensive evening window can multiply the value of each kilowatt-hour several times over. The honest rule we use on projects: buy the battery for the tariff, not for the feeling. In retail-rate net-metering markets it is an insurance purchase; in avoided-cost markets it is a core part of the system design, and our battery calculator exists to size that storage against your actual evening load, not against marketing figures.
On a grid-tied project in Ma'an, southern Jordan, we watched the first summer under net metering do something no sales brochure could: the client's meter ran backwards most afternoons, and by the annual true-up the export balance had covered nearly all of the following year's winter consumption. What changed his next decision wasn't the savings — it was seeing the credit roll forward on paper, exactly as the program promised. Since then, before any design conversation, we open the client's last twelve bills and the utility's current export-compensation terms. The tariff decides the architecture; the architecture decides the hardware. Skip the first step and you will buy the wrong hardware at the right price.
What to check before you sign anything
Five questions answer 90% of the "will this pay back?" problem, and each one takes a phone call to the utility to resolve. One: is my area on net metering, net billing, or a feed-in tariff, and what is the exact export rate? Two: is my system size within the program's eligibility cap, and does my roof's orientation affect the credited output? Three: do credits roll over, and what happens at the annual true-up? Four: will my existing meter be replaced with a bidirectional one, and what does that cost? Five: if the program is under regulatory review, what grandfathering applies to systems connected this year? The answers go straight into the ROI calculator and convert a vague promise into a number.
Common net metering questions, answered
"My bill went down but isn't zero — is something wrong?" Almost certainly not. Fixed charges, meter fees and taxes remain on every bill even when your net energy is zero. A small balance is the normal shape of a net-metered bill.
"Can I sell power back for cash?" Generally no — net metering programs issue bill credits, not checks. Some utilities pay out unused credits at true-up at the avoided-cost rate, which is far below retail; most simply zero the balance.
"Do credits cover my neighbor's house?" Only under virtual net metering or community solar arrangements, which exist in a limited number of markets. Standard net metering attaches credits to the meter/account, not the person.
"Will net metering still exist when my system is 15 years old?" Programs evolve, but most jurisdictions grandfather existing customers at the rates in effect when they connected — often for a fixed term such as twenty years. That grandfathering is the strongest argument for not delaying a well-designed installation.
Frequently asked questions
What exactly happens to the electricity my panels produce?
Your home uses what it can first. Anything left over flows through the bidirectional meter onto the grid, and your utility records it as exported kWh. Those exports become bill credits at whatever rate your local program offers — full retail under true net metering, or a reduced avoided-cost rate under net billing. At night or on cloudy days you pull from the grid, and the credit balance is drawn down.
What is the difference between net metering and net billing?
Net metering credits exports at the full retail rate (1:1 — if you pay 30 cents/kWh, you earn 30 cents/kWh). Net billing credits exports at a much lower rate, usually the utility's avoided cost (roughly 3–8 cents/kWh in places like California under NEM 3.0). Net billing cuts export income dramatically and makes self-consumption — ideally with a battery — far more valuable than grid export.
Do net metering credits expire?
It depends entirely on your utility's program. Many US programs roll credits over month to month and then hold an annual true-up, paying out or zeroing the balance at year end; some European feed-in schemes pay monthly at a fixed tariff; some markets simply expire unused credits. Check your utility's tariff or the DSIRE database for your region before sizing.
Does net metering change how large my solar system should be?
Yes. Under 1:1 net metering, modest oversizing is fine because every exported kWh earns full credit. Under net billing, exported kWh are worth pennies, so the system should be sized to your self-consumption — and a battery becomes part of the design, not an option. Right-sizing against your actual load profile matters more than ever.
Is net metering available everywhere?
Most US states plus D.C. and Puerto Rico have mandatory net metering rules, and most other developed markets have an export-compensation scheme of some kind — net metering, net billing, or a feed-in tariff. But the details (rates, caps, grandfathering, true-up rules) vary enormously by state, country and utility. Check your local regulator's or utility's program before quoting savings.