Independent solar advice in Naperville

Naperville Solar Installation 2026

Naperville has its own municipal electric utility, not ComEd. No size cap since April 2025. Illinois Shines SREC eligible.

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The federal residential solar tax credit ended on December 31, 2025. We tell you the truth about what is left in 2026: which state programs still apply, and which financing paths can still capture federal value.

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Average local electricity rate (cents/kWh): 14
Peak sun hours per day (NREL): 4.45
Typical installed cost per watt: $3.03
Estimated payback (years, zero federal credit): 14

Electricity rate as of 2026-01-01. Sun hours: NREL PVWatts annual average, northern DuPage/Will County fixed tilt. Cost per watt: EnergySage 2026, Naperville area Will County; Illinois state range $3.00-$3.05/W. Payback estimate assumes zero federal residential credit (Section 25D expired December 31, 2025) and current utility net-metering tariffs.

Net metering in Naperville

Naperville Municipal Net Metering (updated April 2025): 1:1 kWh credit against the electric utility portion of the monthly bill. Unused credits accumulate through the year and expire March 31; expired credits are paid out at the avoided-cost rate of 4.9 cents/kWh in April. Size cap on solar arrays eliminated in April 2025. All solar customers must sign a new Interconnection Agreement with the City of Naperville Electric Utility and pay $5/month for 5 years into the Naperville Renewable Energy Program.

Available programs

Solar incentives in Naperville, IL for 2026

Incentives available in IL

Federal residential solar credit (Section 25D): expired. The Section 25D residential investment tax credit expired December 31, 2025. The residential credit rate is 0%. State and local incentives below may still significantly reduce your net system cost. Commercial systems still qualify for Section 48E (30%).

Active solar incentives in IL
Program	Benefit	Eligibility	Status	Source
Illinois Shines (IPA SREC Program) Local/State Incentive	Upfront lump-sum payment from the IPA representing 15 years of projected REC production. Naperville customers are eligible for Illinois Shines despite having a municipal utility. 2026-27 program year opens June 2026 with proposed increases. Verify current REC rate applicability for Naperville municipal utility customers with your installer at illinoisshines.com. Proposed 2026-27 increases not yet final.	Naperville residents with qualifying solar systems (municipal utility customers are eligible)	Active	DSIRE (opens in new tab)
Illinois Property Tax Exemption Local/State Incentive	Under 35 ILCS 200/10-10, solar added value excluded from property tax assessment - no property tax increase from solar.	All Illinois homeowners with solar	Active	DSIRE (opens in new tab)
Illinois Solar for All Local/State Incentive Waitlisted as of 2026-06-29. Apply early; verify at dsireusa.org.	Covers 70-100% of installation costs for income-qualified households (under 80% AMI). Waitlist for 2026-27 opens June 2026. Waitlist for 2026-27 opens June 2026. Verify at illinoissfa.com.	Naperville households at or below 80% AMI	Waitlisted	DSIRE (opens in new tab)
Naperville Renewable Energy Program Enrollment (cost, not incentive) Local/State Incentive	Required enrollment; $5/month for 5 years ($300 total) when joining net metering. This is a cost to the homeowner, not an incentive. This is a required cost, not a benefit. Note it in your system economics.	All Naperville net metering customers	Active	DSIRE (opens in new tab)

Data last verified June 29, 2026. Incentive programs change; verify current amounts and availability at dsireusa.org (opens in new tab) before committing to a project.

California property-tax exclusion sunsets December 31, 2026. Solar systems installed and permitted by December 31, 2026 lock in the exclusion for the life of the system under current California law (Revenue and Taxation Code Section 73). Systems installed in 2027 may not qualify if the Legislature does not extend the exemption. Verify current legislative status at ftb.ca.gov before signing a contract.

Why Naperville homeowners are moving now

After the January 2025 wildfires, battery storage became a priority

Naperville eliminated its solar system size cap in April 2025, opening the door for oversized arrays (12-20 kW or more) designed to cover EV charging or maximize SREC production. The April 2025 interconnection policy update briefly slowed installations as all existing and new customers signed new agreements, but cleared a permitting backlog by mid-2025. Naperville is a high-income, owner-occupied suburb with median home values consistently above $400,000 and a large share of high-footprint homes where 12-20 kW systems are economically rational. The DuPage County portion of Naperville has seen above-average rooftop solar adoption.

Source: Naperville April 2025 policy update: size cap eliminated, new Interconnection Agreements required (2025).

Illustrative example

What does a typical Naperville solar system actually cost and save?

Zero federal residential credit applied (Section 25D expired December 31, 2025). Figures are estimates based on market data as of 2026-06-29. Your numbers depend on your roof, your utility, and your bill.

System inputs

System size: 12 kW
Gross cost ($3.03/W): $36,360
Federal residential credit: $0 (expired Dec 31, 2025)
Illinois Shines SREC upfront payment (15-year projected RECs; verify Naperville municipal utility eligibility): Applied
Illinois Property Tax Exemption (no assessed-value increase): Applied
Estimated net cost: $36,360

Estimated outcomes

Annual savings range: $1,500 to $2,200
Estimated payback: 14 years

Naperville's municipal electric rate (approximately 14 cents/kWh all-in) is about 18% below ComEd's approximately 17 cents/kWh, extending payback relative to ComEd-served suburbs. The ComEd $300/kW rebate does NOT apply here. Illinois Shines upfront SREC payment adds value for Naperville customers. Unused annual credits expire March 31 and are paid out at 4.9 cents/kWh - design for self-consumption. No federal residential credit in 2026. Required $5/month for 5 years ($300 total) enrollment fee not shown in net cost but reduces net savings.

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Neighborhoods we serve

Solar in Naperville: high-adoption areas, equity zones, and post-fire demand corridors

High-adoption neighborhoods

Established solar saturation; higher installers per block, active neighbor referrals, and permit history at LADBS.

North Naperville
Wheatland Township
Knoch Knolls area
Springbrook Prairie
Downtown Naperville area

Equity program target areas

Designated disadvantaged communities (DAC) eligible for SGIP equity resiliency, DAC-SASH, and other income-qualified programs. Income verification required.

Naperville Township income-qualified zones

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Permitting and interconnection

How solar permitting works in Naperville

Authority Having Jurisdiction (AHJ)

Permit office: City of Naperville (Building Permit and Electrical Permit, online portal)
SolarAPP+ status: SolarAPP+: Status unconfirmed
Permit fee: Naperville: separate Building Permit and Electrical Permit required. Fee range approximately $150-$400 (valuation-based). PE stamp required for systems 10 kW and above. SolarAPP+ not confirmed in use as of June 2026. Online permit portal. Approximately 2 weeks review for residential solar.
Typical contract-to-energization: 6 to 10 weeks (permit approximately 2 weeks, Naperville municipal interconnection; all customers sign Interconnection Agreement with City of Naperville Electric Utility)

We handle the permit and interconnection filings

LADBS permit application and plan set preparation
SolarAPP+ submission for qualifying systems
LADWP or SCE interconnection application
Inspection coordination and utility sign-off
Certificate of Completion delivery to homeowner

Naperville requires all solar customers to sign an Interconnection Agreement with the City of Naperville Electric Utility (post-April 2025 policy). The ComEd $300/kW DG Smart Inverter Rebate does NOT apply in Naperville municipal territory. PE stamp required for systems 10 kW and above. Solar customers must pay $5/month for 5 years into the Naperville Renewable Energy Program upon enrolling in net metering. April 2025 policy update eliminated the system size cap, opening the door for oversized arrays (12-20 kW+) designed to maximize SREC production or cover EV charging loads.

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Serving Naperville and surrounding IL communities

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North Naperville REVIEW -- TO BE PROVIDED

[REVIEW TEXT - TO BE PROVIDED: real customer testimonial mentioning Naperville municipal utility, size cap removal, and SREC payment]

System: 14 kW rooftop solar, Naperville municipal utility, oversized post-2025 policy

Wheatland Township, Naperville REVIEW -- TO BE PROVIDED

[REVIEW TEXT - TO BE PROVIDED: real customer testimonial from Naperville municipal utility customer]

System: 10 kW rooftop solar, Naperville Electric Utility

Downtown Naperville area REVIEW -- TO BE PROVIDED

[REVIEW TEXT - TO BE PROVIDED: real customer testimonial mentioning EV charging and oversized system]

System: 12 kW rooftop solar, EV charging integration

For business owners and property managers

Commercial Solar in Naperville

Naperville's commercial real estate, industrial parks, and major employer base (McDonald's corporate campus, Nicor Gas, Navistar facilities) create significant commercial solar opportunity. The Illinois Shines commercial REC program applies in Naperville's municipal utility territory. The federal 48E commercial credit requires construction to begin by July 4, 2026. Verify interconnection requirements with the City of Naperville Electric Utility for commercial systems.

See commercial solar options

Commercial solar projects must begin construction by July 4, 2026 to qualify for the 30 percent Section 48E federal tax credit. After that date, the system must be placed in service by December 31, 2027.

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Naperville solar questions

What Naperville homeowners ask

City-specific answers. Every number references your utility and your permit office.

Is Naperville served by ComEd or its own electric utility?

Naperville has its own municipal electric utility, the City of Naperville Electric Utility. It is NOT served by ComEd. This is a critical difference: ComEd programs like the $300/kW DG Smart Inverter Rebate do NOT apply in Naperville. Naperville has its own net metering policy: 1:1 credit against the electric utility portion of the bill, with unused credits expiring March 31 and paid at 4.9 cents/kWh avoided-cost rate.

What changed with Naperville's solar policy in April 2025?

In April 2025, Naperville updated its net metering policy and eliminated its solar system size cap. Previously there was a limit on solar array size. Removing the cap opened the door for larger systems (12-20 kW or more) designed to cover EV charging or maximize Illinois Shines SREC production. All Naperville solar customers, including those with existing systems, were required to sign new Interconnection Agreements and enroll in the Naperville Renewable Energy Program ($5/month for 5 years).

Why is Naperville's payback period longer than Chicago suburbs?

Naperville's municipal electric rate (approximately 14 cents/kWh all-in) is about 18% lower than ComEd's approximately 17 cents/kWh rate for comparable suburbs, meaning each kWh of solar production saves less money. The ComEd $300/kW smart inverter rebate also does not apply. However, Naperville's no-size-cap policy, larger homes, and higher household incomes allow oversized systems that still achieve strong long-term returns, particularly when Illinois Shines SREC income and EV charging load are factored in.

Is there a federal solar tax credit in 2026?

No. The Section 25D residential solar tax credit expired December 31, 2025. Naperville's active incentives: Illinois Shines SREC upfront payment (Naperville municipal utility customers ARE eligible despite not being ComEd customers; verify with your installer) and the Illinois Property Tax Exemption under 35 ILCS 200/10-10.

More solar resources for Illinois:

Illinois solar guide All cities

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