State Guide
Solar Panel Cost in Illinois (2026)
See how much solar panels cost in Illinois with local electricity rates, incentives, and payback estimates.
Last updated: 2026-06-09· Source label: EIA residential electricity rates, IRS federal clean energy credit, NREL/PVWatts solar assumptions
Illinois solar benefits from one of the Midwest's strongest policy frameworks: the Climate and Equitable Jobs Act underpins the Illinois Shines Adjustable Block Program, which pays SREC income per megawatt-hour of solar production. Full retail net metering preserves export value for most residential systems. At $0.19/kWh, Illinois electricity runs well above the national average, so bill savings add up quickly. ComEd serves Chicago and northern Illinois, Ameren Illinois covers the central and southern regions, and MidAmerican Energy operates in the Quad Cities area. Because Illinois is a deregulated electricity market, supply and delivery charges differ by territory. SREC block availability, utility tariff, roof production, seasonal swings, and installer pricing all shift the final payback.
Texas Solar Calculator
Estimates based on illinois state averages. Your actual cost depends on roof, equipment, installer, and financing.
Incentives & Rebates
Federal Residential Credit Caveat
For projects where IRS project-year rules support a residential credit, a 30% credit would be roughly $6,720 on a $22,400 system. For 2026+ residential projects, RenewableCalc keeps this at 0% unless current IRS guidance supports eligibility.
State and Utility Incentive Context
Illinois: Illinois Shines (Adjustable Block Program) SREC-based ~$0.05/kWh. Property tax exemption. Calculator default local value: verify current program amounts at dsireusa.org before any federal residential credit. Verify current program funding, utility territory, DSIRE listings, and tax eligibility before relying on this incentive in a quote.
Net Metering
Illinois solar exports are modeled as Full retail net metering. Confirm the current utility tariff, retail-credit or avoided-cost treatment, monthly rollover, and annual true-up before sizing a system around exported kWh.
Top Electric Utilities
- 1. Commonwealth Edison
- 2. Ameren Illinois
- 3. MidAmerican Energy
Source: EIA-861, by customer count
Recommended next steps
Calculate your ROI
Use Solar Panel Cost in Illinois (2026) defaults with pre-filled state data.
Review an installer quote
Validate price per watt, system size, and financing terms.
Compare ownership models
Buy vs Lease vs PPA — see which fits your situation.
Refine your estimate
Use the Solar ROI Calculator with your Illinois utility rate, annual kWh usage, and quote assumptions.
Frequently Asked Questions
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Show my solar path →Overview
Illinois solar benefits from one of the Midwest's strongest policy frameworks: the Climate and Equitable Jobs Act underpins the Illinois Shines Adjustable Block Program, which pays SREC income per megawatt-hour of solar production. Full retail net metering preserves export value for most residential systems. At $0.19/kWh, Illinois electricity runs well above the national average, so bill savings add up quickly. ComEd serves Chicago and northern Illinois, Ameren Illinois covers the central and southern regions, and MidAmerican Energy operates in the Quad Cities area. Because Illinois is a deregulated electricity market, supply and delivery charges differ by territory. SREC block availability, utility tariff, roof production, seasonal swings, and installer pricing all shift the final payback.
Use this result
Use the calculator inputs first, then compare the result against local rates, incentives, roof conditions, and utility export rules.
Method, assumptions, and sourcesOpen this section when you want to audit the calculation behind the estimate.ShowHide
Calculation Method
Illinois solar payback = net installed cost after incentives / annual avoided electricity cost plus export credits
Key Assumptions
- Policy last reviewed: 2026-06-09. Federal residential credit assumptions are project-year dependent and not applied by default for 2026+ projects.
- Residential rate and installed-cost figures are planning benchmarks, not a final utility bill audit or installer quote.
- The model assumes a roof with usable sun exposure; shading, roof age, electrical upgrades, permitting, and financing can materially change cost.
- Illinois economics should be checked against state solar incentives, ComEd/Ameren rate and net-metering differences, and Midwest seasonal production swings.
- The federal tax credit only helps households with sufficient tax liability and qualifying project documentation.
Data Sources
Electricity rates
EIA Electric Power Monthly
Residential electricity-rate benchmark used for avoided-bill savings.
Solar production
NREL PVWatts
Solar production assumptions should be checked against local roof orientation, shading, and climate.
Federal incentive
IRS Residential Clean Energy Credit
Supports 2026 Section 25D expiration (residential ITC no longer available by default) for qualifying residential solar costs.
State and utility policy
DSIRE and local utility tariff pages
Used as a reminder to verify state incentives, net-metering, export-credit, and rebate rules before relying on an estimate.
Result Summary
Net cost before federal residential credit
~$21,400
Uses Illinois's $2.80/W installed-cost default and $1,000 state/local incentive default; no 2026+ federal residential credit is applied by default.
Estimated payback
7-9 years
Depends on actual utility rate, Full retail net metering, installed cost, roof production, financing, and incentive eligibility.
Annual bill offset
$1,200-$1,650/yr
Estimate based on a 8.0 kW system, 4.5 peak sun hours/day, $0.14/kWh, and PVWatts-style production before fixed charges or export-credit adjustments.
Formula Assumptions Data Sources FAQ Related Links
Compare Solar Costs With Neighboring States
Solar economics vary by state. Compare Illinois with nearby states to see how electricity rates, incentives, and payback periods differ in your region.