Net Metering, Explained for Homeowners

A lot of people picture net metering as the power company buying their extra solar and mailing them a check. That’s not how it works, and the distance between that mental image and the reality is where a fair number of solar owners end up disappointed. Net metering is a billing arrangement, not a purchase program. When your panels make more than the house is using, the surplus flows onto the grid and your meter records a credit. When the house draws more than the panels are making, you pull from the grid and spend those credits back down. At the end of a billing cycle you pay for your net consumption, which is exactly what the name says and nothing more.

The reason the distinction is worth caring about is money, and quite a lot of it. Under the most generous version of the rule, a kilowatt-hour you export at noon fully offsets a kilowatt-hour you import at eight in the evening, dollar for dollar. Under the weaker versions that have become common, the exported kilowatt-hour is worth only a fraction of the imported one, and your real savings shrink in proportion. Same panels, same roof, same sun, but very different economics, and the difference is decided entirely by which flavor of netting your utility happens to offer. That makes your local net metering policy one of the largest single variables in whether solar pays off quickly or slowly for you, which is why it deserves more attention than the brand of panel on your roof.

What the meter does, and what your exports are actually worth

A solar home has a bidirectional meter, which simply means it counts electricity flowing in both directions rather than only the power you consume. On a sunny afternoon when the array outproduces the house, power runs backward onto the grid and the meter logs that export. After sunset, when the panels are idle, the meter logs your imports the way any meter always has. Net metering nets those two flows against each other over the billing period instead of charging you for every kilowatt-hour you draw while ignoring everything you sent back. The practical effect is that the grid behaves like a bank for your surplus. You don’t have to consume your solar power at the precise instant it’s generated, because midday overproduction can be stored as a credit and reclaimed later that evening. That single feature is what allows solar to offset nighttime usage at all, even though the panels produce nothing after dark, and it’s the mechanism behind most of the savings people associate with going solar.

Within a single month the arithmetic is easy to follow. Exports reduce the kilowatt-hours you’re billed for, one for one under full netting, so a month where you exported 300 kWh and imported 900 kWh leaves you paying for 600 kWh of net consumption. The wrinkle shows up across seasons rather than within a month. Solar production peaks in the long, bright days of summer and slumps in winter when the days are short and the sun rides low, while household usage often runs the other way, spiking with air conditioning or electric heat. Many homes therefore bank a surplus during the bright months and draw it back down during the dark ones. Utilities handle that seasonal swing with an annual settlement usually called a true-up. Over the year your credits roll forward month to month, and once a year the utility closes out the account. If you finish the year holding leftover credits, you’re often paid for them, but frequently at a low wholesale-style rate rather than the retail rate you originally earned them at. That detail is a quiet but real argument against deliberately oversizing a system, because excess annual production tends to be cashed out cheaply, so building an array far larger than your yearly usage rarely pays for itself.

Two specifics vary by utility and are worth confirming in writing before you commit, because both change how a system sized slightly above your usage actually performs. The first is whether credits expire or carry forward indefinitely. The second is whether the annual true-up pays you cash for a surplus or simply zeroes the balance and moves on. Neither answer is exotic, but they’re the kind of thing that never comes up in a sales conversation and then determines whether the last few hundred kilowatt-hours your system makes each year are worth real money or nothing at all. What net metering never touches, in any of these arrangements, is the set of fixed charges on your bill. Every grid-connected home pays a monthly connection charge, and some utilities layer on minimum bills or solar-specific fees, none of which the netting can erase. That’s the main reason a solar bill rarely reaches zero even under strong net metering, a gap worth understanding before you’re surprised by it, and one the breakdown of your electric bill after solar walks through in detail.

All of that mechanical detail leads to one question that matters more than the rest, which is what an exported kilowatt-hour is actually worth to you. There are broadly two answers, and they produce dramatically different bills from identical hardware. Under full retail net metering, exports are credited at the same rate you pay for imports. The timing of your production barely matters under this structure, because a credit earned at midday completely cancels consumption at night. This is the arrangement that produces the biggest savings, and it’s the one nearly everyone pictures when they hear the phrase net metering. Under net billing, or an export-rate structure, exports are credited at a lower, separately set rate. Sometimes that’s half of retail, sometimes a quarter, sometimes it’s pegged to a wholesale market price that moves around. The moment your export rate drops below your retail rate, the timing of your usage starts to matter enormously. Every kilowatt-hour you consume as you generate it avoids a full-price import, but every kilowatt-hour you export earns only the reduced rate. The share of your production you manage to use on-site, rather than send back to the grid, becomes a central driver of how much you save.

A worked example makes the size of that effect concrete. Assume a system produces 9,000 kWh a year, your retail rate is $0.18/kWh, and you self-consume 40% of what the panels make. Under full netting, all 9,000 kWh offset retail imports, so the production is worth about $1,620. Under a net-billing scheme that pays $0.06/kWh for exports, the 3,600 kWh you use on-site are still worth the full $0.18, or $648, but the 5,400 kWh you export are worth only $324, for roughly $972 total. That’s about forty percent less value from exactly the same panels under exactly the same sun. Nothing about the system changed. The billing rule did, and it took a large bite out of the savings. Many states have been shifting away from the first structure toward the second, and California’s overhaul is the best-known example of how sharply that transition can change the arithmetic for new solar owners, which the California net metering breakdown lays out.

This is also precisely why a battery has become more attractive in net-billing territory than it ever was under full retail netting. When exports were worth full price, there was little financial reason to store surplus instead of selling it straight back to the grid, since a stored kilowatt-hour and an exported one were worth the same thing. When exports are worth a quarter of retail, storing that midday surplus and using it at night, instead of exporting it cheap and buying it back expensive after dark, recovers real money on every cycle. The value of storage, in other words, is downstream of your netting rules rather than independent of them. A homeowner in a full-retail region and one in a strict net-billing region can install the identical battery and get very different financial returns, entirely because the rule that governs their exports is different. Homes that already run big daytime loads, an EV charging in the afternoon, central air conditioning, a pool pump, naturally self-consume more of their production and come out ahead under net billing without needing a battery at all, while homes that sit empty all day and export most of their midday output feel the reduced export rate most acutely and have the strongest case for storage.

What to pin down before you sign, and the questions people forget to ask

Because export policy swings the outcome so hard, it’s the first thing to nail down before trusting any savings estimate a salesperson hands you. A quoted payback figure is only as good as the netting assumption underneath it, and that assumption is almost always the most favorable arrangement available, whether or not it’s the one you’ll actually get. Under full netting, the simple version of the savings equation, annual production times your retail rate, holds up well enough to plan around. Under net billing you need two additional inputs before the estimate means anything: your specific export rate and your realistic self-consumption share. Feed your production estimate, your retail rate, and your export rate into the solar ROI calculator and you’ll get a payback figure grounded in your actual situation rather than an optimistic default, and a fuller treatment of how all these variables combine lives in how much solar panels save.

A short list of confirmations, gathered in writing before you sign, protects you from the most common and most expensive surprise, which is discovering after installation that your credits are worth less than the quote assumed. Ask whether compensation is full retail net metering, net billing, or an export rate, and what the current export credit is actually worth per kilowatt-hour, because that single number can move your savings by a third. Ask whether the program trues up annually and whether leftover credits are paid in cash or simply cleared, since that determines whether an oversized system’s surplus is worth anything. Ask whether there are solar-specific fixed charges, minimum bills, or demand charges that kick in once you interconnect, because those can quietly claw back part of what the netting gives you. And ask whether the current program is grandfathered for a set number of years from your interconnection date, and what happens to your terms when that window closes. That last point matters more than it first appears. Many programs lock in your terms for a fixed period, so the rules on the day you switch on may be the rules you keep for years even as the utility changes them for later customers, and knowing the length and terms of that lock-in is part of valuing the system honestly rather than optimistically.

Most of these answers are findable if you know where to look, and you shouldn’t rely on a salesperson to volunteer them. The authoritative source is your utility’s tariff sheet or its net metering rider, usually posted on the utility’s website and written in dense but specific language that spells out the export rate, the true-up terms, and any solar-specific charges. If you can’t parse it, a short call to the utility’s interconnection or solar desk will confirm the current structure, and it’s worth asking them to point you to the document so you have it in writing rather than a verbal assurance. Whatever the export rate turns out to be, get it onto the quote itself, so the savings figure the installer is selling you is tied to the number your utility will actually pay rather than an optimistic placeholder. The one input you’ll have to estimate yourself is your self-consumption share, the fraction of your production you use as you generate it, and a reasonable starting point is to look at how much of your usage falls during daylight hours on your existing bill, since a household that runs a big daytime load already self-consumes more than one that sits empty until evening. Under net billing, that single percentage can swing your annual savings by hundreds of dollars, which is why it’s worth thinking about honestly rather than assuming the best case, and why a battery, which raises your effective self-consumption by shifting surplus into the evening, changes the math so much when exports are cheap.

It helps to hold onto a few plain answers to the questions that come up most. Net metering does not usually mean the power company pays you cash during the year; exports become bill credits that offset imports, and only leftover credits at the annual true-up are sometimes paid out, often at a low rate. It will rarely take your bill to zero, because the fixed connection charge survives even when credits fully cover your energy usage, so a well-sized system typically erases most of the energy portion rather than the entire bill. And full retail netting has genuinely been narrowing in a number of states, replaced by net billing or export rates that pay less for surplus, which hasn’t ended net metering but has made confirming your utility’s current structure the essential first step rather than an afterthought. Get those answers in hand before you sign, and the rest of the solar decision rests on solid ground instead of a hopeful assumption about a rule you never actually checked.