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Illinois Solar Panel Calculator

Local rates, sun hours & savings — specific to Illinois

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3.98

Peak Sun Hrs/Day

$0.150

Avg Rate ($/kWh)

$117

Avg Monthly Bill

16 yrs

Est. Payback

Illinois transformed its solar landscape with the Climate and Equitable Jobs Act, creating the Illinois Shines program that provides Renewable Energy Credits worth thousands of dollars upfront. Despite modest sun hours (3.98/day), the REC incentive combined with rising ComEd rates has made solar increasingly compelling, especially in the Chicago suburbs. This calculator models Illinois sun hours and electricity rates — factor in the REC value for a more complete financial picture.

3.98 hrs

Sun Hours/Day

$0.150

Rate ($/kWh)

$2.80

Avg Cost/Watt

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Solar Data for Illinois

Peak Sun Hours
3.98 hrs/day (NREL annual avg)
Avg Electricity Rate
$0.1504/kWh (EIA 2024)
Avg Monthly Bill
$117/month
Avg Install Cost
$2.80/W (LBNL Tracking the Sun)
Est. Payback (avg bill)
16 years (before 30% ITC)
Federal ITC
30% through 2032

Solar Panels in Illinois — Frequently Asked Questions

How do rising electricity rates affect solar ROI?▾
Every 1¢/kWh increase in your utility rate improves your solar savings proportionally. If rates rise 3% annually (historical average), your payback period shortens and 25-year savings grow substantially. Solar essentially locks in your electricity cost at installation, hedging against future rate increases.
Should I add battery storage to my solar system?▾
Battery storage (like the Tesla Powerwall or Enphase IQ Battery) costs an additional $10,000–$15,000 per battery. It makes sense if: (1) you're in a state with unfavorable net metering (like California's NEM 3.0), (2) you experience frequent outages, or (3) you want to maximize self-consumption. For most homeowners with standard net metering, batteries don't improve payback period.
What are my options for financing solar panels?▾
The main options are: (1) Cash purchase — best ROI, you get the full ITC. (2) Solar loan — low-rate loans from installers, Sungage, GreenSky, or your credit union allow ownership with no upfront cost. You still get the ITC. (3) HELOC — if you have home equity. (4) Solar lease/PPA — no ownership, no ITC, lower savings but zero upfront. (5) PACE financing — property-assessed loans available in some states.
What state incentives are available for solar in addition to the federal ITC?▾
Beyond the 30% federal ITC, many states offer additional incentives: property tax exemptions (most states), sales tax exemptions (many states), cash rebates (e.g., NY-Sun, Colorado RENU), performance payments (SREC markets in NJ, MA, DC, MD, PA, OH), and low-interest loans. Check dsireusa.org for your state's current programs.
Do solar panels work in cold climates and winter?▾
Yes — solar panels actually perform slightly better in cold temperatures (heat reduces semiconductor efficiency). The challenge in cold climates is fewer daylight hours and potential snow accumulation. A 10-degree tilt is usually sufficient for snow to slide off naturally. Northern states like Massachusetts and New York still have thriving solar markets despite cold winters.

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7 kW Solar System

Full cost and savings breakdown for a 7 kW installation

Disclaimer: Data sources: NREL PVWatts (sun hours), EIA 2024 Residential Rate Survey (electricity rates), Lawrence Berkeley National Lab Tracking the Sun (install costs). Estimates are for planning only. Actual savings depend on your specific roof, shading, utility policies, and available incentives. Not financial or tax advice.