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Solar Installed but Still Dark? Illinois Gives Your Utility 15 Business Days
guide11 min read

Solar Installed but Still Dark? Illinois Gives Your Utility 15 Business Days

Ryan Cook••

If your solar panels are installed but still dark in Illinois, the clock that matters is the utility's: under state rule 83 Ill. Adm. Code Part 466, your utility has 7 business days to confirm your Level 1 application is complete and 15 business days to screen it, and Ameren Illinois' own guide says Level 1 witness tests are completed within 15 business days of your installer reporting construction complete, with permanent permission to operate typically two business days after a passed test. Most home systems that stall are stuck on paperwork nobody filed, not on the utility.

The panels went up three weeks ago. The truck is gone, the roof looks finished, and the electric bill that showed up Tuesday is identical to last month's. I get this call more than almost any other — usually from somewhere around Springfield, Edwardsville, or Decatur — and the voice on the other end sits somewhere between confused and furious.

Here's the part that rarely gets explained at the kitchen table. Installing a solar system and being allowed to run it are two separate events, and a state process with real deadlines sits between them.

Step Deadline Source
Utility tells you whether your application is complete 7 business days after receipt 83 Ill. Adm. Code 466.90(b)(2)
You supply any missing information 10 business days, or the request is deemed withdrawn 466.90(b)(2)
Utility verifies the Level 1 screens 15 business days after the request is complete 466.90(b)(3)
Interconnection agreement (minor modifications needed) 10 business days after you elect to proceed and pay 466.90(b)(4)(B)
Interconnection agreement (more than minor modifications) 15 business days after election and payment 466.90(b)(4)(C)
You sign and return the agreement 30 business days (one 15-day extension allowed) 466.90(b)(5)
Ameren Level 1 witness test Completed within 15 business days of construction-complete paperwork Ameren DER guide, effective 6-21-2023
Witness test results Within 48 hours of the test Ameren DER guide
Permanent permission to operate Typically within two business days of a passed test Ameren DER guide
Retest after a failed witness test Scheduled within 30 business days Ameren DER guide
Level 1 application fee (Ameren) $50 Ameren DER guide

Your panels aren't yours to switch on yet

Ameren Illinois publishes a public-facing guide to how it connects distributed energy resources, and the flow chart in it is refreshingly plain. Seven steps: submit application and payment, verify application completeness, engineering review or study, generate and process the interconnection agreement including construction payment, customer and Ameren construction, witness test, grant permission to operate.

Your installer's work — the panels, the racking, the inverter — is step five. Two steps come after it.

The last one has a name worth knowing. Ameren defines permission to operate, or PTO, as "official permission granted by Ameren Illinois to operate DER in parallel of the Ameren Illinois EPS after successfully completing a witness test." Until that letter exists, a finished array is roof decoration.

The state rule nobody hands you

Illinois governs this under 83 Ill. Adm. Code Part 466, the rule covering electric interconnection of distributed energy resources facilities. The current version took effect May 26, 2022, and it applies to systems of 10 MVA or less that aren't under FERC or RTO jurisdiction. Your house is comfortably inside that.

Part 466 sorts projects into four review levels, and home solar almost always lands in Level 1 — the fast lane. A project qualifies for Level 1 if it's inverter-based with lab-certified equipment, has an export capacity of 25 kW or less and a nameplate capacity of 50 kW or less. If the export capacity isn't limited, nameplate can't top 25 kW. A normal Bloomington rooftop at 8 or 10 kW clears that easily.

Level 1 is where the deadlines live:

  • 7 business days for the utility to tell you whether your application is complete.
  • 15 business days after that for the utility to verify your system passes the Level 1 screens.
  • If no utility construction is needed, the conditional agreement to interconnect comes with those screen results. If only minor system modifications are needed, the utility has 10 business days after you elect to proceed and pay the fee to send the interconnection agreement, or 15 if more than minor modifications are needed.

Stack the utility's deadlines and a Level 1 project needing minor modifications runs about 32 business days — call it six and a half weeks — as the outside edge of the paperwork under the rule. With no construction at all, it's 22. Not a promise that it takes that long. A ceiling.

The clock runs both directions, which people forget. You get 10 business days to supply missing information before the request is treated as withdrawn, and 30 business days to sign and return the agreement, with one 15-business-day extension the utility can't refuse. Miss those and you start over. I've watched a homeowner lose five weeks to an unopened envelope.

What Ameren puts in writing

This is where the guide earns its keep, because Ameren commits to numbers most homeowners assume don't exist.

Level 1 costs $50 to apply. Every interconnection gets witness tested — Ameren is explicit that this includes Level 1 facilities, no exceptions. The test is scheduled when your installer submits documentation that construction is complete, and the guide states that "Level 1 witness tests are completed within 15 business days as a technician becomes available to complete the test."

Then it gets faster. Witness test results go to the customer within 48 hours. If everything passes and no power quality meter was used, you get a written conditional permission to operate on the spot, and the guide says a permanent PTO is "typically within two business days of the witness test."

If the test doesn't pass, another one gets scheduled within 30 business days so you have time to fix the problem.

My honest read: that's a tighter set of commitments than the industry's reputation would suggest. When a project drags in Ameren territory, the delay is more often a permit, a corrected application, or an installer who hasn't filed the completion paperwork than it is the utility sitting on a file.

Northern Illinois works the same way in shape. ComEd runs its version through Green Power Connection, and its net metering FAQ says participation begins after your interconnection application is approved and ComEd signs a Certificate of Completion confirming the system has permission to operate. Same two gates: an approval, then a completion sign-off.

The horror stories you found are about a different line

Search this topic for ten minutes and you'll hit an alarming one. In late 2025, news coverage described Ameren Illinois' interconnection queue as backed up for years, with the utility studying large projects one at a time while ComEd reviewed proposals concurrently.

That backlog is real. It is also almost entirely community solar and large distributed projects — not houses.

Ameren's own guide draws the line: Level 1 and smaller Level 2 applications are queued based on when the application was submitted and which circuit will serve it. Larger projects get routed to an engineer to screen aggregate impacts on the sub-transmission system. Different path, different timeline.

If someone quotes you a multi-year wait for a home system in Illinois, they've read the wrong queue. That single confusion has talked more Illinois homeowners out of running the numbers than any objection I hear about price.

Don't let anyone flip it early

Sometimes an installer finishes on a Friday and the homeowner asks the obvious question: can't we just turn it on?

Don't.

The witness test simulates a utility outage to confirm your inverter stops producing instead of quietly energizing a line that crews believe is dead. Ameren's guide is direct that an unintentional island can put energized equipment at ground level within reach of utility personnel and the public. There are also failure modes — a step-up or step-down transformer between the connection point and the inverter, for instance — that can stop a certified inverter from detecting an outage at all, and that only surface during an on-site test.

There's a paperwork reason too. During the test, Ameren personnel verify the installed system matches what was described in the application. And if a power quality meter is used, Ameren's witness test criteria say the disconnect switch stays open until the power quality data is analyzed and a permanent PTO is issued.

Wait for the letter.

Your PTO date is worth money

One more reason to care about this timeline: the date your system was completed and documented sets your net metering terms.

Customers whose systems were installed and fully documented by December 31, 2024 kept full retail rate net metering for what Ameren describes as the 30-year life of the generator, with credits offsetting charges across the whole bill. Systems completed on or after January 1, 2025 get credits on the supply and transmission portions only — delivery charges stay on your bill for every kilowatt-hour you pull, regardless of how much you send back. With Ameren's summer supply price at 11.326¢/kWh for the first 800 kWh and ComEd's at 10.399¢/kWh through September 30, 2026, the supply side is the piece solar is working against.

That's not a reason to rush. It's a reason to understand what you're actually buying before the first payment shows up. I'd rather a customer in Peoria go in with the right expectation than get a pleasant surprise on the sales call and an unpleasant one in July.

Four questions worth asking before you sign

  1. Which review level did you file, and on what date? Level 1 should be the answer for a house. The submission date sets your place in the queue.
  2. Who submits the completion paperwork, and how fast after the install? The witness test can't be scheduled until it lands. This is the step that quietly eats weeks.
  3. What's your plan if the witness test doesn't pass? There's a 30-business-day window to fix problems. A good company already knows that.
  4. Will you send me the PTO letter itself? Not a text saying you're all set. The document.

An installer who can answer those without checking has done this in Illinois before. One who can't is learning on your roof — and when a solar company folds mid-project, the unfiled completion paperwork is what strands the homeowner.

Where a lease changes the picture

None of the process above changes based on how you pay. Part 466 doesn't care whether you own the panels. What changes is who chases the paperwork.

On a lease, the company that owns the system carries the interconnection filing, the completion documentation, and the follow-up when a witness test gets rescheduled — because it doesn't get paid until the system runs. That alignment is worth more than it sounds. On a cash purchase, which is the path that opens up the state's REC payments, you're more often the one making the phone calls.

A solar lease in Illinois gives you a predictable rate as low as $0.10/kWh for the power your roof produces, with the full 25-year rate schedule set in your contract before you sign. Any savings figure is an estimate until we've looked at your actual usage, your roof, and your utility.

If your panels are up and nothing has happened, call me at (618) 217-2001 or reach out through the contact page. Tell me your install date and which utility you're on, and I can usually tell you within a few minutes which step you're stuck on. Half the time it's a completion form nobody filed. If you're still deciding, the cost breakdown is the honest place to start.

Sources

Timelines above are the deadlines those documents set, not a prediction of any individual project. Every project is different — I'm a registered Designee under Illinois Shines, not your utility.

Frequently Asked Questions

There's no single number, but Illinois sets deadlines for most of the steps. Under 83 Ill. Adm. Code Part 466, your utility has 7 business days to tell you whether your interconnection application is complete, then 15 business days to verify your system passes the Level 1 screens. If no utility construction is needed, the conditional agreement to interconnect comes with those screen results; if minor system modifications are needed, the utility has 10 more business days after you elect to proceed to send the agreement. That's roughly four and a half to six and a half weeks of paperwork at the outside edge. After your installer reports construction complete, Ameren Illinois says in its own guide that Level 1 witness tests are completed within 15 business days, and permanent permission to operate typically follows within two business days of a passed test. Your own delays count too: 10 business days to supply missing information and 30 business days to sign the agreement.
No, and I'd push back hard on anyone who suggests otherwise. Permission to operate is defined by Ameren Illinois as official permission to run your system in parallel with the utility's electric system after successfully completing a witness test. That witness test exists for a specific reason: Ameren simulates a grid outage to confirm your inverter shuts down instead of quietly backfeeding the line. A system that keeps pushing power into a dead wire creates what the industry calls an unintentional island, and Ameren's guide is blunt that it risks contact with energized equipment for utility crews and the public. There's a second reason too. During the witness test, Ameren personnel verify that the system actually installed matches the system described in your application. Running early can also complicate your net metering paperwork. Wait for the letter, and keep the disconnect switch where your installer left it.
Level 1 is the fast lane, and almost every Illinois home solar system lands in it. Under Part 466, a project qualifies for Level 1 review if the system has an export capacity of 25 kW or less and a nameplate capacity of 50 kW or less, is inverter-based, and uses lab-certified equipment. If the export capacity isn't limited, the nameplate capacity can't exceed 25 kW. A typical house in Peoria or Belleville runs somewhere between 6 and 12 kW, so it clears those thresholds without trouble. Ameren Illinois describes Level 1 in its own guide as the level likely connected behind the meter at a residence or small business, and lists the Level 1 application fee as $50. Knowing your project is Level 1 matters because Level 1 carries the shortest deadlines in the rule and the shortest witness-test commitment. Ask your installer to confirm which level was filed.
Because those stories are about a different line than the one your house stands in. The backlog you read about in the news in late 2025 was Ameren Illinois' queue of large distributed projects, overwhelmingly community solar, which the utility was studying one at a time rather than concurrently. That backlog is real, and it genuinely threatens large community solar and commercial projects racing federal deadlines. It is not the residential rooftop process. Ameren's own interconnection guide says Level 1 and smaller Level 2 applications are queued based on the time the application is submitted and the circuit serving the proposed interconnection, while larger projects are routed to an engineer to screen for aggregate impacts on the sub-transmission system. That is a much simpler path than the engineering studies big projects require. I have to un-explain this on the phone constantly. If someone quotes you a multi-year wait for a home system in Illinois, they're reading the wrong queue.
Yes, and it's the part of this timeline that carries real money. Illinois changed how net metering works based on when your system interconnected. Residential customers whose systems were installed and fully documented by December 31, 2024 receive full retail rate net metering for what Ameren describes as the 30-year life of the generator. Credits under that older arrangement offset charges across the whole bill. For systems completed on or after January 1, 2025, credits apply only to the supply and transmission portions — delivery charges stay on your bill for every kilowatt-hour you pull from the grid, no matter how much you send back. If you're going solar in 2026, you're in the newer arrangement, so the practical thing to understand is which parts of your bill solar actually offsets. It changes what a realistic estimate looks like.

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