DuPage & Will counties
Solar Panels in Naperville, Illinois
Naperville is the unusual one: it buys and distributes its own electricity through a city-run utility instead of ComEd, so the solar rules here are set by the City — not by the state rules most online guides describe.
Your utility in Naperville: not ComEd
Almost every online solar guide for Illinois assumes you are a ComEd customer. In Naperville that assumption is wrong. The City buys and distributes its own power, and it sets its own net metering policy — so the numbers you read on national comparison sites do not describe your bill.
The detail that changes how you size a system
- Exported energy is credited 1 kWh for 1 kWh against the electric-utility portion of your City bill.
- Credits roll over monthly, but expire every March 31.
- Whatever is left is paid out in April at the avoided-cost rate of 4.9¢/kWh — a fraction of retail.
- So oversizing is penalized here. A system built to bank a big surplus gets that surplus cashed out cheaply each spring. Size to your actual annual usage.
Source: City of Naperville net metering policy (updated April 2025).
Local considerations
- Your permit is issued by the City of Naperville’s Transportation, Engineering & Development (TED) Business Group, applied for through the City’s online permitting portal. A reputable installer pulls this for you.
- A signed City interconnection agreement is required before your system can be energized — this is separate from the building permit.
- Naperville’s net metering policy was updated in April 2025 and removed the previous cap on residential array size, so system sizing is driven by your roof and usage rather than a City limit.
What Naperville homeowners can claim
Federal tax credit — ended
The 30% federal residential credit ended December 31, 2025. Buy in 2026 with cash or a loan and there is no federal credit. Leases and PPAs differ — the system owner may still claim a business credit through 2027 and reflect it in your rate.
Illinois Shines (SRECs)
Pays for the renewable energy credits your system produces, generally as an upfront payment covering about 15 years of generation. Municipal utility territories, including Naperville, are eligible to participate.
Net metering
City of Naperville policy: 1:1 kWh credit, annual expiry on March 31, residual paid at 4.9¢/kWh.
Property tax treatment
Illinois provides a special assessment for solar energy systems so that adding solar does not increase your property tax the way a comparable improvement would. Ask your installer to confirm the filing.
Want the arithmetic for your own bill? Use the savings calculator or read the full Illinois incentives guide.
Permits and interconnection in Naperville
Naperville handles solar permitting through its Transportation, Engineering & Development (TED) Business Group, with applications submitted through the City's online permitting portal. Separately, the City requires a signed interconnection agreement before your system may be energized — the building permit alone is not enough.
City of Naperville — TED Business Group
400 S. Eagle St., Naperville, IL 60540
(630) 420-6100 · Monday–Friday, 9 a.m.–4 p.m.
Fees and review timelines are not published as a flat figure — they depend on system size and scope, so ask your installer to itemize permit costs in the quote rather than quoting you a number we cannot verify.
Solar in Naperville: common questions
Who is my electric utility in Naperville?
Naperville is served by the City of Naperville’s own municipal electric utility, not ComEd. This matters more than most homeowners expect: your net metering terms are set by City policy rather than by the state rules that apply across most of northern Illinois.
How does net metering work in Naperville?
Naperville credits exported energy one kilowatt-hour for one kilowatt-hour against the electric-utility portion of your bill. Unused credits accumulate month to month but expire every March 31, and anything left over is paid out in April at the avoided-cost rate of 4.9 cents per kWh — far below retail. The practical takeaway: sizing your system to your actual annual usage matters more here than in ComEd territory, because heavily over-producing gets cashed out at a low rate instead of banked forever.
Do I qualify for Illinois Shines in Naperville?
Yes. Illinois Shines (the Adjustable Block Program) pays for the Renewable Energy Credits your system generates, typically as an upfront payment covering roughly 15 years of production. Projects in municipal electric utility and rural cooperative territories are eligible to participate alongside ComEd, Ameren and MidAmerican customers — so both Naperville and ComEd-served homes across our service area can take part.
What permits do I need in Naperville?
You need a solar photovoltaic permit from the City of Naperville’s Transportation, Engineering & Development (TED) Business Group, submitted through the City’s online permitting portal, plus a signed interconnection agreement with the City utility before the system is energized. Reputable installers handle both as part of the job — ask them to confirm it in writing.
Is solar worth it in Naperville with Illinois winters?
Yes — panels actually operate more efficiently in cold temperatures; the limiting factor in winter is shorter days and snow cover, not the cold itself. Northern Illinois systems typically generate most of their annual output between spring and early autumn, which is exactly why annual credit banking matters and why the local net metering terms above are worth understanding before you size a system.
Get solar quotes for your Naperville home
Tell us about your home and we'll connect you with licensed installers serving Naperville. Free, no obligation.
Takes less than 2 minutes · 100% free · No credit check · Local installers only