Net metering explained in one sentence: when your panels make more electricity than you use, the surplus goes to the grid and you earn bill credits—then you draw those credits back at night or on cloudy days. Without fair export rules, “extra solar power” can be worth far less than the glossy proposal implied.
A client once celebrated a sunny May afternoon with near-zero imports—then opened June’s bill and saw almost no credit for exported kilowatt-hours. Their utility had moved from classic 1:1 net metering to a weaker export rate. The panels still worked. The policy changed the ROI.
I model interconnection economics weekly. Here is what happens to your extra solar power—and when it stops paying.
Think of the grid as a shared bank account for electrons. Net metering is a generous interest rate. Weak export tariffs are a vault that charges you to make a deposit.
Size production against your usage in the Solar System Calculator, then stress-test payback in our is solar worth it guide. If you are choosing ownership vs lease, export credits matter differently—see solar lease vs buy.
1. What net metering actually does
Under classic net metering (often called NEM), a bidirectional meter tracks energy you import from the utility and energy you export. Over a billing period, exports offset imports—sometimes kWh-for-kWh at the full retail rate. That is why mid-day surplus can power evening loads on paper, even without a battery.
Self-consumption
Power used in the home the moment panels produce it. Highest value—you avoid buying retail electricity. No policy debate required.
Export / surplus
Power sent to the grid when production exceeds load. Value depends entirely on your utility’s tariff: full retail credit, avoided-cost rate, or time-of-use (TOU) export prices.
2. Full retail credit vs weaker export rates
Classic 1:1 net metering
One exported kWh cancels one imported kWh at roughly the same retail rate. Oversizing the array still has limits (annual true-up rules, export caps), but the economic story is simple and homeowner-friendly.
Best for:
Homes that produce more at noon than they use—remote workers with daytime loads still win, but evening-heavy households also get fair credit for surplus.
NEM successors and low export tariffs
Many utilities now pay less for export than they charge for imports—sometimes a fraction of retail. Your “extra solar power” still flows to neighbors; you just bank fewer dollars. That is when batteries and load shifting start to matter.
Expert opinion:
I will not size a system for 120% of annual usage in a weak-export market. Oversizing to “send free power to the grid” is charity dressed as ROI. Match production to self-consumption first.
3. Time-of-use (TOU) and what happens hour by hour
Why noon surplus can be cheap
On TOU rates, electricity is expensive in evening peaks and cheaper midday—exactly when many rooftops flood the grid with solar. Export credits may track those lower midday prices.
- Shift EV charging and laundry into solar hours.
- Consider a hybrid battery to move noon kWh into peak windows.
- Ask for export rates by time block—not just “net metering yes/no.”
Batteries as a policy hedge
When export is cheap, storing surplus for evening use often beats selling it. Battery sizing is a separate decision—see our lithium battery sizing guide.
Counterintuitive stat: the U.S. Energy Information Administration tracks rising solar share on the grid—more daytime solar can lower midday wholesale prices, which is exactly why some utilities redesign retail export credits.
4. Net metering vs alternatives at a glance
| Policy style | What you get for surplus | Homeowner tip |
|---|---|---|
| Full retail NEM | ~1:1 credit at retail rate | Right-size to annual kWh; avoid wild oversize |
| Reduced export / NEM 3.0-style | Export paid below retail | Maximize self-use; model battery carefully |
| TOU export | Credits vary by hour | Shift loads; evening peaks matter more |
| Feed-in tariff (FIT) | Fixed $/kWh for exported power | Compare FIT rate to your retail buy rate |
| No export / zero export | Surplus clipped or unused | Size for daytime load; storage critical |
For interconnection and grid-integration context, see NREL solar integration resources—utilities redesign retail credits partly because distributed solar changes when the grid needs power.
5. The verdict: is your surplus worth banking?
Strong net metering if...
Export credits near retail, clear annual true-up rules, and your installer models your tariff—not a national average. Then surplus mid-day power is a real savings tool, not decoration on a bill.
Still verify line items in every proposal—export assumptions hide easily in production PDFs.
Pause / redesign if...
Export pays pennies, TOU makes noon surplus nearly worthless, or the quote assumes 1:1 credits your utility no longer offers. Right-size the array, shift loads, or add storage—do not buy unused exports.
Extra solar power always goes somewhere. The question is whether you get paid fairly for it.
Model production before you trust export credits
The Solar System Calculator estimates system size and savings so you can compare quotes against your real usage—not against a utility policy you have not read.
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Serhii Bereshchuk
Founder of Global Sun Hub
Serhii is the founder and developer of Global Sun Hub. Building from Ukraine, he specializes in creating high-precision, unbiased tools for the solar community. His mission is to replace high-pressure sales pitches with raw technical data and free, professional-grade planning tools.
