Net metering is the billing arrangement that makes rooftop solar math work for most homeowners: when your panels produce more than your house is using, the surplus flows to the grid and your utility credits you for it. Without an approved net metering (or “interconnection”) agreement, that surplus may earn you little or nothing — and in some territories you’re not even allowed to energize the system until the paperwork clears.
Here’s the thing nobody tells you up front: there is no single “net metering program.” Every state sets its own policy, and every utility implements that policy with its own forms, fees, timelines, and quirks. So instead of pretending one set of rules applies everywhere, this guide walks you through the process that’s common to almost all of them — and shows you exactly how to find the specific rules for your utility. When we went through interconnection on our own 40-panel system here in Florida, the process itself was straightforward; the confusing part was figuring out which documents our utility actually wanted and in what order. That’s what this guide fixes.
Step 1: Find Your Utility’s Actual Rules
Before you fill out anything, locate the source documents. Search for your utility’s name plus “net metering,” “interconnection,” or “customer-owned renewable generation.” You’re looking for three things:
- The interconnection application — usually a PDF or online portal form.
- The tariff or rate schedule — this defines how exported energy is credited (full retail rate, avoided cost, or something in between), whether credits roll over month to month, and what happens to unused credits at year-end (called the “true-up”).
- The technical requirements — equipment certification standards, system size caps, and insurance requirements, if any.
Two independent resources are worth bookmarking. The DSIRE database (dsireusa.org), maintained by NC State University, catalogs net metering and interconnection policy by state. Your state public utility commission website publishes the tariffs that investor-owned utilities must follow. If you’re served by a municipal utility or rural electric cooperative, be aware they often set their own policies — sometimes friendlier than the state standard, sometimes far less so — and their rules may only exist as a page on their own website or a document you have to call and request.
Questions to answer before you sign a solar contract, not after:
- How is exported energy credited — retail rate, or a lower export rate?
- Is there a cap on system size (often a percentage of your historical usage)?
- Is there an application fee, and does system size change it?
- Is a new meter required, and who pays for it?
- Do credits expire, and when is the annual true-up?
Step 2: Know Who Files What
If you’re using a professional installer, they almost certainly handle the interconnection application as part of the job — it’s standard practice, and frankly it’s one of the best reasons to hire a company that works in your utility’s territory regularly. They know which reviewer wants what.
But “the installer handles it” doesn’t mean you should be hands-off. You are the account holder, so the agreement is in your name, and you’ll typically need to sign the application and the final interconnection agreement. Ask your installer three things at contract signing: who submits the application, when they submit it (before or after installation — utilities differ on whether they want the application pre-construction), and how you’ll be notified at each milestone. When we did ours, the installer filed everything, but the approval emails came to us — if we hadn’t been watching for them, we’d have added days to the timeline.
If you’re a DIY installer, the burden is entirely on you, and expect extra scrutiny: many utilities require proof that the installation was performed or signed off by a licensed electrician.
Step 3: Gather the Documents
Utilities vary, but the document list is remarkably consistent. Use this checklist and confirm each item against your utility’s actual application instructions:
| Step | Document / Item | Where It Comes From | Common Gotcha |
|---|---|---|---|
| 1 | Interconnection application | Utility website or portal | Wrong form version — utilities revise these |
| 2 | One-line electrical diagram | Your installer | Must match installed equipment exactly |
| 3 | Site plan / panel layout | Your installer | Some utilities want it, some don’t — check |
| 4 | Equipment spec sheets | Manufacturer websites | Inverter must be certified to UL 1741 |
| 5 | Proof of electrical permit | Your city or county | Apply early — this is often the slowest item |
| 6 | Signed inspection / final permit | Local building department | Utility usually won’t approve without it |
| 7 | Proof of insurance (if required) | Your homeowner’s policy | Only some utilities require it — verify |
| 8 | Signed interconnection agreement | Utility (after review) | Unsigned agreement = no permission to operate |
The equipment certification item deserves a note: virtually every utility requires that your inverter meet UL 1741 (the safety standard for grid-tied inverters, which ensures the system shuts off during an outage so it can’t back-feed the grid and endanger line workers). Any reputable modern inverter carries this listing, but the utility will still want the spec sheet showing it.
Step 4: Submit and Track the Application
Submit through whatever channel your utility specifies — increasingly an online portal, occasionally still email or paper. Before you hit send, review everything against the installed system. The single most common cause of delays is a mismatch: the application says one inverter model and the roof has another, or the panel count changed during installation and nobody updated the paperwork.
After submission, the typical flow looks like this:
- Completeness review — the utility confirms nothing is missing. Incomplete applications usually go to the back of the queue, so getting it right the first time genuinely matters.
- Technical review — an engineer checks that your system won’t cause problems on the local circuit. Small residential systems usually pass without drama.
- Meter work — many utilities swap in a bidirectional meter that can record both imports and exports. Some newer smart meters already do this.
- Permission to Operate (PTO) — the letter or email that says you may turn the system on.
Timelines range from a few business days to a couple of months depending on the utility and their backlog. Ask your installer what’s typical in your territory, and don’t be shy about polite follow-up calls if you pass the utility’s own stated review window.
One rule worth taking seriously: don’t energize the system before you have PTO unless your utility explicitly allows it. Running early can violate the tariff, and in the worst case a utility can make you shut down and restart the process.
Step 5: Understand Your First Solar Bill
Your first bill after PTO will look different, and it’s worth ten minutes to actually understand it rather than skimming. Look for:
- Imports vs. exports — how many kWh you pulled from the grid and how many you sent back.
- Credit mechanics — whether exports offset your usage one-for-one or are credited at a separate rate.
- Fixed charges — most utilities charge a monthly customer or service fee that solar can’t offset. If your bill never hits zero, this is usually why.
- Banked credits — surplus that rolls forward to future months, if your program allows it.
Also find your true-up date. Many programs settle accounts annually: leftover credits might roll over, get paid out at a low wholesale rate, or expire entirely. Knowing this changes how you think about sizing and usage — surplus that expires is surplus you gave away.
Keeping Your Net Metering Status Healthy
Enrollment isn’t quite fire-and-forget. A few habits protect the arrangement long-term:
- Keep your paperwork. Save the signed interconnection agreement, PTO letter, and approved application. If you sell the house, the buyer’s transfer process starts with these.
- Report system changes. Adding panels or a battery later usually requires an amended interconnection application. Doing it quietly can violate your agreement.
- Watch for tariff changes. Net metering policy is actively evolving in many states, and utilities periodically propose new rate structures. Existing customers are often grandfathered under their original terms for a set period — but you only benefit from grandfathering if you know what your original terms were.
- Compare production to your bill occasionally. Your monitoring app tells you what the system made; your bill tells you what the utility credited. If they drift apart significantly, ask questions — occasionally a meter or billing setup is wrong, and it’s your money.
The bottom line: net metering enrollment is a paperwork exercise, not a technical ordeal. Find your utility’s actual rules first, let your installer drive if you have one, verify every document matches the installed system, and wait for PTO before flipping the switch. Get those four things right and the process is boring — which, for paperwork, is exactly what you want.