When a solar sales rep says you can “sell your excess power back to the grid,” they’re talking about net metering. But that phrase significantly oversimplifies how it actually works — and in many states, it doesn’t even apply anymore. Understanding the difference between net metering, net billing, and avoided-cost buyback can mean thousands of dollars in projected savings that either materialize or don’t. Here’s the real picture.
Thank you for reading this post, don’t forget to subscribe!The Basic Mechanics of Net Metering
When your solar panels produce more electricity than your home is currently using, the surplus flows back through your utility meter and onto the grid. Your utility company measures this exported power and applies a credit to your account at the full retail electricity rate.
Later — at night, on cloudy days, or whenever your home needs more power than your panels are producing — you draw electricity from the grid normally. Those usage charges are offset by the credits you built up from your exports.
At the end of each billing period, the utility nets the two amounts. If you exported more than you used, you either carry a credit forward or receive a small check. If you used more than you exported, you pay only the difference. That’s net metering: you’re billed on the net of what you produced vs. what you consumed.
This is why many solar homeowners end up with electric bills of $10–$20 per month — that’s often just the fixed utility connection fee, not actual electricity usage charges.
The Key: You’re Credited at the Full Retail Rate
The financially important feature of classic net metering is that exported solar power is credited at the full retail electricity rate — the same rate you’d pay to buy that power from the grid. If your utility charges $0.18/kWh, your exported solar is worth $0.18/kWh as a credit.
This 1:1 credit value is what makes net metering so powerful. Without it — if you were only credited at the wholesale rate — solar savings would be substantially lower. This distinction is at the center of ongoing utility battles in many states.
Net Metering vs. Net Billing vs. Avoided-Cost Buyback
Here’s where it gets complicated — and where a lot of homeowners get misled. Not every state offers true net metering. There are three different programs that go by similar names but work very differently:
True Net Metering
Credits are applied at the full retail rate. One kWh exported = one kWh credit on your bill. This is the gold standard and is still available in most northeastern and midwestern states.
Net Billing
Exported power is credited at a different (usually lower) rate than the retail rate. California moved to this model in 2023 under NEM 3.0, dropping export credits to roughly $0.05/kWh in many cases — versus retail rates of $0.25–$0.35/kWh. This dramatically changes the ROI calculation and makes battery storage far more important in those markets, since storing power for self-consumption becomes much more valuable than exporting it.
Avoided-Cost Buyback
Utilities pay you the wholesale market rate for exported power — typically $0.03–$0.06/kWh. Some states in the South use this model. At these rates, exporting solar is barely worth anything, and the financial case for solar relies almost entirely on self-consumption: using the power you produce before it leaves your home.
| Program Type | Export Credit Rate | Battery Important? | Example States |
|---|---|---|---|
| True Net Metering | Full retail rate (~$0.12–$0.30/kWh) | Optional | MA, NY, NJ, IL, many others |
| Net Billing | Below retail (~$0.05–$0.15/kWh) | Strongly recommended | CA (NEM 3.0), some Western states |
| Avoided-Cost Buyback | Wholesale rate (~$0.03–$0.06/kWh) | Essential for ROI | Parts of TX, FL, Southeast |
Annual vs. Monthly True-Up: How Credits Roll Over
Most net metering programs allow credits to roll forward month to month. This is important because solar production is highly seasonal — you’ll produce significantly more in summer than in winter. The rollover system lets you bank summer surplus to cover winter shortfalls.
Many utilities do an annual “true-up” where your full-year production and consumption are reconciled. If you produced more than you consumed over the year, you may receive a small payment — but usually at a lower rate than retail. The structure varies by utility, which is why it’s worth asking your installer specifically how your local utility handles annual credit reconciliation.
How Time-of-Use Rates Interact with Net Metering
If your utility offers time-of-use (TOU) pricing — where electricity costs more during peak hours and less during off-peak — net metering credits follow those same time-based rates. Exporting power during peak hours earns you a higher credit than exporting during off-peak hours.
This is why battery storage adds so much value in TOU markets: you can store solar production during the low-value midday period and either use it or export it during high-value evening peak hours. Our guide on time-of-use electricity rates and how to beat them covers this strategy in detail.
How to Check What Program Your State Uses
The Database of State Incentives for Renewables and Efficiency (DSIRE at dsireusa.org) is the authoritative source for state-by-state net metering rules. Enter your state and look for “Net Metering” under program types. You’ll see exactly how your state’s program works, what utilities are required to participate, and any recent changes to the rules.
This is also worth checking before signing a solar lease or PPA — some of those agreements were written under old net metering rules that no longer apply, which changes the financial projections significantly. Our full breakdown of state solar incentives is in our state-by-state solar incentives guide.
Net Metering and System Sizing
In true net metering states, the conventional wisdom is to size your system to match your annual consumption — since excess production at retail-rate credit is nearly as valuable as consumption offset. The math works out well.
In net billing or avoided-cost states, the calculus changes. Oversizing your system to export a lot of power at a low rate doesn’t make financial sense. Instead, you size to your base consumption and add battery storage to maximize self-consumption. It’s a fundamentally different system design driven entirely by your state’s export compensation program.
This connects directly to how much solar can actually save you. Our guide on how much solar can save on your electric bill models savings under each of these different program structures with real numbers.
The Bottom Line
Net metering is the billing mechanism that makes solar financially powerful — but only when it credits you at the full retail rate. Before you get serious about a solar quote, find out exactly which program your utility uses: true net metering, net billing, or avoided-cost buyback. That single answer changes your system sizing strategy, your battery storage decision, and your entire ROI projection.
Don’t take an installer’s word for it. Look up your utility’s specific program on DSIRE, and make sure the financial projections in your quote match the actual export rate — not an assumed 1:1 retail credit that may no longer exist in your state.
To understand the full picture of how solar pays off financially, start with our foundational guide on how solar panels actually work — the generation side of the equation that feeds into the billing credits covered here.