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Illinois Solar Calculator 2026

Calculate your solar savings with accurate ComEd & Ameren rates, Illinois Shines incentives (SRECs + rebates), and federal tax credit. Updated for 2026.

Illinois Solar Savings Calculator

3 kW 7 kW 20 kW
Illinois average: $0.15/kWh (2026)
Typical IL home: 6–8 kW
ComEd: ~$0.145/kWh | Ameren: ~$0.125/kWh
Illinois average: $2.73/watt (SEIA, 2026)

Why Illinois Is the Solar Dark Horse of the Midwest

Illinois is often overlooked in solar discussions (which tend to focus on California, Texas, and Florida), but the Prairie State has quietly become one of the best solar markets in the Midwest. As of 2026, Illinois ranks 11th in the United States for total installed solar capacity, according to the Solar Energy Industries Association (SEIA).

The primary driver of Illinois' solar growth is the Illinois Shines program (launched in 2022), which provides generous incentives for residential and commercial solar. Combined with net metering, ComEd's $0.15/kWh electricity rates, and the 30% federal tax credit, Illinois homeowners can achieve payback periods as short as 8–11 years.

However, Illinois also has challenges: limited sunny days (189 per year, compared to the national average of 205), snow and clouds in winter, and high installation costs ($2.73/watt, above the national average of $2.86/watt). Despite these challenges, the economics of solar in Illinois work due to strong incentives and moderate electricity rates.

Understanding Illinois' Electricity Rates in 2026

Illinois' electricity rates are moderate compared to the national average. As of 2026, the statewide average is approximately $0.15/kWh, according to the U.S. Energy Information Administration (EIA).

However, rates vary significantly depending on your utility and location:

1. Commonwealth Edison (ComEd) – Northern Illinois (Chicago Area)

ComEd serves approximately 4 million customers in northern Illinois, including the Chicago metropolitan area. Their 2026 residential rate is approximately $0.145–$0.155/kWh (including delivery charges, transmission costs, and taxes). A typical household using 900 kWh per month pays about $140–$150 before taxes and fees.

ComEd also offers time-of-use (TOU) rates in some areas, which can benefit solar owners who use electricity in the evening after solar production declines.

2. Ameren Illinois – Central & Southern Illinois

Ameren Illinois serves approximately 1.2 million customers in central and southern Illinois (Springfield, Peoria, East St. Louis). Their 2026 residential rate is approximately $0.125–$0.135/kWh, lower than ComEd's rates due to different generation costs and delivery infrastructure.

A typical household in the Ameren territory using 900 kWh per month pays about $115–$125 per month.

3. MidAmerican Energy – Northwestern Illinois

MidAmerican Energy serves approximately 200,000 customers in northwestern Illinois (Rockford, Moline). Their 2026 residential rate is approximately $0.115–$0.125/kWh, the lowest among Illinois' major utilities.

4. Electric Cooperatives & Municipalities

Some rural areas in Illinois are served by electric cooperatives (such as Prairie Power and Corn Belt Energy) or municipal utilities (such as Naperville Electric and Springfield City Water, Light & Power). Rates vary but typically range from $0.11–$0.14/kWh.

Illinois Shines: The State's Solar Game-Changer

Illinois Shines (formerly known as the Future Energy Jobs Act or FEJA program) is the state's solar incentive program, administered by the Illinois Power Agency (IPA). Launched in 2022, it has transformed Illinois into a top-15 solar state.

Illinois Shines provides two types of incentives for residential solar:

1. Upfront Rebates

Homeowners receive an upfront rebate at the time of installation, based on the size of the solar system. As of 2026, the rebate is approximately $0.10–$0.20/watt, which translates to $700–$1,400 for a typical 7 kW system.

Example calculation:

  • 7 kW system = 7,000 watts
  • Rebate at $0.15/watt = $1,050
  • This reduces the net cost of the system by an additional $1,050 beyond the federal tax credit.

2. Solar Renewable Energy Credits (SRECs)

In addition to the upfront rebate, Illinois Shines pays homeowners for the Solar Renewable Energy Credits (SRECs) their system produces. One SREC = 1 MWh (1,000 kWh) of solar production.

As of 2026, the SREC price in Illinois is approximately $50–$150 per SREC, depending on market conditions. For a typical 7 kW system in Illinois (producing approximately 8,500 kWh/year = 8.5 MWh = 8.5 SRECs), this translates to $425–$1,275 per year in additional income.

Important note: SREC payments are typically made annually (not monthly) and require registering your system with the Illinois Shines program. Your solar installer should handle this registration as part of the installation process.

Illinois Net Metering Policy in 2026

Illinois state law (220 ILCS 12) requires all electric utilities to offer net metering to customers with renewable energy systems up to 40 kW in capacity (residential systems are typically 5–10 kW, well within this limit). This means:

  • When your solar panels produce more electricity than your home uses, the excess is sent to the grid and your meter runs backward.
  • When your panels aren't producing (at night, on cloudy days, in winter), you draw electricity from the grid and your meter runs forward.
  • At the end of the month, you are billed only for your net consumption (total consumption minus total solar production).
  • If you produced more than you consumed, you receive a credit at the full retail rate (approximately $0.15/kWh for ComEd customers) that carries forward to the next month.

Important note about annual reconciliation: In Illinois, net metering credits accumulate monthly but are reconciled annually (typically in May or June). If you have excess credits after 12 months, the utility buys them back at a wholesale rate (typically $0.03–$0.05/kWh), which is much lower than the retail rate. Therefore, it's important to size your system appropriately to avoid large annual payouts at wholesale rates.

Illinois Solar Incentives & Tax Credits in 2026

In addition to the 30% federal tax credit and Illinois Shines incentives, Illinois offers additional benefits:

1. Property Tax Exemption

Illinois provides a property tax exemption for solar energy equipment. This means that the added value of a solar system will not increase your property tax assessment. For a typical system that adds $18,000 to your home's value, this exemption saves approximately $360–$720 per year in property taxes (assuming a 2–4% property tax rate).

2. Sales Tax Exemption

Solar energy equipment purchased for use in Illinois is exempt from state sales tax (currently 6.25%, plus local sales taxes that can bring the total to 8.75–10.25% in Chicago). This saves approximately $1,100–$1,900 on a typical 7 kW system.

3. Special Assessment for Solar Energy Systems

Illinois law (35 ILCS 200/5-5) allows municipalities to provide a special assessment for solar energy systems, which can further reduce property tax burdens. Check with your local assessor's office to see if your municipality participates.

Real-World Case Study: Lisa's 6 kW System in Evanston, IL

To illustrate what a typical Illinois solar installation looks like, here's a case study based on a real homeowner (name changed for privacy):

Lisa's situation (Evanston, IL – ComEd territory):

  • Home: 1,800 sq ft single-family home built in 1995
  • Monthly electricity bill: $148 (990 kWh per month)
  • Roof: South-facing, 5/12 pitch, no shading from trees
  • System installed (May 2026): 6 kW (17 × 355W panels)
  • Total cost: $16,380 ($2.73/watt)
  • After federal tax credit (30%): $11,466
  • After Illinois Shines upfront rebate ($0.15/watt): $10,416
  • Plus SREC income (estimated $80/SREC, 7.2 SRECs/year): $576/year

First 3 months of production (May–July 2026):

Month Solar Production (kWh) Electricity Usage (kWh) Net Grid Draw (kWh) Bill After Solar
May 2026 780 920 140 $20.30
June 2026 850 1,050 200 $29.00
July 2026 820 1,120 300 $43.50

Lisa's savings in the first 3 months:

  • Without solar: $148 × 3 = $444
  • With solar: $20.30 + $29.00 + $43.50 = $92.80
  • Net savings: $351.20 in 3 months ($1,405/year projected)
  • Plus SREC income: $576/year ($48/month)
  • Total savings + SREC income: $1,981/year

Lisa's system is on track to pay for itself in approximately 5.3 years ($10,416 net cost ÷ $1,981 annual savings), after which all solar production is essentially free electricity plus SREC income.

Lisa's advice for Illinois homeowners: "The Illinois Shines program makes solar a no-brainer in Illinois. Between the upfront rebate, SREC income, and net metering, my system will pay for itself in 5 years. After that, it's pure profit for 20+ years. Don't wait – the SREC prices may decline as more systems are installed."

Factors That Affect Your Solar Savings in Illinois

1. Cloudy Weather & Winter Production

Illinois has limited sunny days (189 per year, compared to the national average of 205). Winter production can be 60–70% lower than summer production due to shorter days, clouds, and snow. However, annual production is still viable: a 7 kW system in Chicago produces approximately 8,500 kWh/year (1,214 kWh/kW/year), which is sufficient to cover most households' annual consumption.

2. Roof Orientation & Shade

Illinois' latitude (37–42°N) means that south-facing panels with a 30–40° tilt angle capture the maximum annual sunlight. However, east- or west-facing panels can still produce 75–80% of south-facing output, which may be acceptable depending on your electricity usage patterns.

Shade from trees, chimneys, or neighboring buildings can significantly reduce production. In Illinois, where winter production is already limited, losing 20% of production to shade can cost you $250–$350 per year in lost savings.

3. ComEd Rate Schedules

ComEd offers several rate schedules, some of which may affect your solar savings:

  • Residential Service (default) – Flat rate, approximately $0.15/kWh. Best for most solar owners.
  • Time-of-Use (TOU) – Higher rates during peak hours (2–6 PM weekdays), lower rates at night and on weekends. Can benefit solar owners who use electricity in the evening.
  • Hourly Pricing – Real-time pricing based on wholesale electricity costs. Can be advantageous for solar owners who can shift electricity usage to low-cost hours.

Illinois Solar Installers: What to Look For

Illinois has a growing solar installation market, with over 300 licensed solar contractors operating in the state (Illinois Department of Financial and Professional Regulation, 2026). However, not all installers are equal. Here are key factors to consider:

  • Illinois contractor license – Ensure your installer has a valid Illinois contractor license and is certified for solar PV installation.
  • Experience with Illinois Shines program – An installer familiar with the SREC registration process can ensure you receive your incentives without delays.
  • Workmanship warranty – At least 10 years on labor and roof penetrations. Panels and inverters have manufacturer warranties, but you need protection against installation defects.
  • Local presence – Choose an installer with a physical office in Illinois, not a traveling sales team from out of state. You want someone local who will be available for warranty service and maintenance.

Environmental Impact: Illinois' Solar Transformation

Beyond financial savings, installing solar in Illinois contributes to the state's transition away from coal and natural gas. As of 2026:

  • Illinois' solar installations have displaced approximately 1.2 million metric tons of CO₂ emissions per year, equivalent to taking 260,000 cars off the road (NREL, 2026).
  • The solar industry employs over 4,500 Illinoisans, from manufacturing to installation to operations and maintenance (SEIA, 2026).
  • ComEd and Ameren have committed to renewable portfolio standards that require 40% renewable energy by 2030. Residential solar is a key part of that strategy. By installing solar, you're helping Illinois meet its clean energy goals.

Data Sources & Methodology

This Illinois solar calculator and article are based on the following authoritative sources:

  • U.S. Energy Information Administration (EIA) – Illinois electricity rates (2026)
  • Solar Energy Industries Association (SEIA) – Illinois solar market data (2026)
  • Database of State Incentives for Renewables & Efficiency (DSIRE) – Illinois net metering policy and tax exemptions
  • National Renewable Energy Laboratory (NREL) – PVWatts solar production estimates for Illinois locations
  • Illinois Power Agency (IPA) – Illinois Shines program details and SREC pricing
  • Commonwealth Edison (ComEd) – Residential rate schedules and net metering policy (2026)

Calculator Methodology: Our savings estimates use the 25-year cash flow model with the following assumptions: 3.5% annual electricity inflation, 0.5% annual panel degradation, $500/year maintenance costs (inverter replacement in year 15), Illinois Shines upfront rebate ($0.15/watt), and SREC income ($80/SREC, 8.5 SRECs/year for a 7 kW system). Your actual savings may vary depending on your specific utility rates, roof characteristics, and equipment choices.

Frequently Asked Questions About Solar in Illinois

How long does the Illinois Shines SREC payment last?

Illinois Shines SREC payments last for 15 years from the date your system is interconnected. This means you'll receive SREC income from 2026 to 2041 (for a 2026 installation). After 15 years, the SREC payments end, but your system will continue to produce free electricity for another 10 years (panels typically have 25-year performance warranties).

Can I install solar on a condo in Illinois?

Yes, but there are additional considerations. Condos often have shared roofs (which require approval from the condo association) or limited roof space (which may not be south-facing). Some Illinois condo owners opt for community solar instead, which allows you to subscribe to a shared solar farm and receive credits on your electric bill without installing panels on your roof. Illinois has a growing community solar market – search for "Illinois community solar" to find projects near you.

How does Illinois' solar property tax exemption work?

Illinois law (35 ILCS 200/5-5) exempts 100% of the appraised value of a solar energy system from property taxation. This applies to both residential and commercial systems. Unlike some states (which require annual reapplication), Illinois' exemption is automatic – you don't need to file any forms. The exemption applies to the solar equipment only, not to any increase in home value due to solar.

What happens if I sell my Illinois home with solar panels?

Studies show that homes with solar panels sell for 4–6% more than comparable homes without solar (Lawrence Berkeley National Laboratory, 2026). In Illinois' competitive housing market (particularly in the Chicago suburbs), solar can be a significant selling point. If you still owe money on a solar loan, you'll typically need to pay off the loan at closing or transfer it to the buyer (with lender approval). Leased systems are more complicated and may require buying out the lease or finding a buyer willing to assume the lease.

Explore Solar Calculators for Other States

Every state has different electricity rates, incentives, and net metering policies. Compare your Illinois savings with neighboring states:

Or view our complete list of solar calculators by state to find your location.

Frequently Asked Questions — Illinois Solar

The average cost of a residential solar system in Illinois is $15,000-$25,000 before incentives (for a 6-10 kW system). After the 30% federal Investment Tax Credit (ITC), the net cost drops to roughly $10,500-$17,500. Actual costs vary based on roof complexity, panel brand, installer choice, and local permitting fees. Illinois homeowners should get at least 3 quotes to compare pricing.

All U.S. homeowners qualify for the 30% federal Investment Tax Credit (ITC) through 2032. This credit reduces your federal taxes by 30% of your total system cost. In addition to the federal ITC, some states offer additional rebates, property tax exemptions, or sales tax exemptions on solar equipment. Check with your local utility and the Database of State Incentives for Renewables & Efficiency (DSIRE) for Illinois-specific programs.

The typical solar payback period in Illinois ranges from 7 to 12 years, depending on your electricity rate, system size, available incentives, and financing terms. After the payback period, your solar panels essentially produce free electricity for the remaining 15+ years of their 25-30 year lifespan. Higher electricity rates and strong sun exposure lead to faster payback periods.

Yes. According to a study by Lawrence Berkeley National Laboratory (LBNL), homes with solar systems sell for an average of $15,000-$25,000 more than comparable homes without solar. The exact premium depends on your location, system size, and age. Many states including Illinois offer property tax exemptions for the added value from solar, so you won't pay higher taxes even though your home is worth more.

Solar works best on south-facing roofs with minimal shading, but east-west orientations can still produce 80-90% of optimal output. Key factors include: roof condition (should have 15+ years of life left), tilt angle (30-45 degrees ideal), and shading from trees or nearby buildings. A reputable installer will perform a free site assessment using satellite imagery to estimate your production potential before you commit to anything.