By Ethan BrooksUpdated November 2026
A solar net metering policy sets the rules for how your utility credits you when your rooftop panels send extra electricity back to the grid. In this guide you’ll learn how those credits are calculated, how to find out which policy your utility uses, and what to confirm before you sign an interconnection agreement. The goal is to help you estimate your real savings instead of relying on a sales estimate.
What a Net Metering Policy Actually Controls
Under net metering, your meter runs both ways. When your panels produce more than your home uses, the surplus flows to the grid and your meter records it as credit. When your home draws more than your panels produce, such as at night, you pull power from the grid and use up those credits. Your policy determines how much each kilowatt-hour of exported power is worth and how unused credits are handled at the end of a billing period.
Shopping for one? See our guide: Net Metering in Virginia vs Virginia Community Solar: Which Should You Choose?.
Most policies cover three things: the credit rate for exported energy, the billing period over which credits net out, and what happens to any leftover credit. Read all three before you compare offers.
Step 1: Find Your Utility’s Current Policy
Net metering rules are set by your state public utility commission and implemented by your local utility, so the details vary widely even within one state. Start with your utility’s website and search for “net metering” or “distributed generation.” Look for the tariff or rate schedule that applies to residential solar customers. Many utilities also publish a sample bill showing how credits appear.
- Locate the residential net metering tariff on your utility’s site.
- Note the credit rate: some utilities credit exports at the full retail rate, others at a lower avoided-cost rate.
- Check the billing period, often monthly, and whether credits roll over to the next month.
- Confirm the annual true-up date, when any remaining credit is paid out or expires.
- Ask whether your policy has a system size cap or a grandfathering date for existing customers.
Step 2: Understand How Credits Are Calculated
Your bill nets out your import and export each billing period. Suppose your panels export 600 kWh in a month and your home imports 450 kWh. You end the month with 150 kWh of credit. If the credit rate is the same as your retail rate, that credit offsets future charges. If the rate is lower, each exported kWh is worth less than each kWh you import, which changes the math significantly.
| Policy feature | What to look for | Why it matters |
|---|---|---|
| Export credit rate | Full retail or avoided cost | Sets the value of every exported kWh |
| Billing period | Monthly or annual netting | Affects how seasonal output is offset |
| Rollover | Carries forward or expires | Determines whether summer surplus helps winter bills |
| Fixed charges | Monthly service fee | Still applies even with a net-zero bill |
Step 3: Confirm the Terms Before You Sign
Installers often quote savings based on the policy they know best, but your utility’s rules govern your bill. Ask the installer to show the specific tariff they assumed. If a policy has changed since your system was designed, the savings estimate may no longer hold. Also review the interconnection agreement, which usually states the policy version that applies to your system. For background on how credits are calculated in practice, see Solar PV Net Metering Explained: How It Works and Credits Your Bill and Solar Net Metering Requirements: What You Need to Qualify (Step-by-Step).
Some states have moved away from full retail netting toward lower export rates. If your state has done this, compare the two options carefully. Solar Net Metering vs Net Billing (2026): Which Should You Choose? walks through that tradeoff in detail.
Common Mistakes
- Assuming the retail rate applies to exports when your utility credits at a lower avoided-cost rate.
- Ignoring the annual true-up date, which can wipe out summer surplus.
- Relying on a sales estimate built on an outdated tariff.
- Forgetting that fixed monthly charges still apply.
- Skipping the system size cap, which can limit how large an array you can connect.
Recommended gear
A home energy monitor helps you see export and import in real time, so you can check whether your bill matches your expectations. View on Amazon is one example of a device that tracks solar production and grid flow at the circuit level.
A smart plug with energy tracking helps you shift flexible loads, such as a dishwasher or EV charger, into hours when your panels are producing. View on Amazon is a common option for this purpose.
FAQ
Does net metering pay me cash for extra power?
It depends on your policy. Many utilities carry credits forward on your bill, while some pay out any unused balance at an annual true-up. Check your tariff to see which applies to you.
How do I know if my utility uses net metering?
Search your utility’s website for “net metering” or “distributed generation” and review the residential tariff. Your installer can also confirm which policy applies to your address.
Can a policy change after I install panels?
Some states grandfather existing systems, but others have changed rules for new customers. Ask your utility whether your interconnection date protects your current terms.
Conclusion
A solar net metering policy determines how much your rooftop power is worth on your bill, so it deserves a close read before you install. Confirm the export credit rate, billing period, and rollover rules with your utility. Consult a qualified solar professional or your utility’s customer service team before making a decision based on financial projections.
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About Ethan Brooks
Ethan Brooks is part of our editorial team and reviews and edits our home solar guides, checking product details against manufacturer specifications and owner feedback.
