The Short Answer
Based on current 2026 pricing across Illinois, installed solar runs roughly $3.00–$4.50 per watt. A typical residential system is 6–12 kW depending on your household’s usage, which puts most Illinois projects between $18,000 and $54,000 before any incentives. That’s the sticker price of the equipment and labor — it is not what most Illinois homeowners actually pay out of pocket. Most go solar through a $0-down Lease or PPA, which means no upfront cost at all. A site-specific design from SolQ shows you both paths and an exact number, free, with no obligation.
Why Illinois Homeowners Are Locking In Now
No hype, just the real reasons this is the year a lot of your neighbors are making the switch — and what you actually walk away with.
- ✓$0 down. Most homeowners we work with start with a Lease or PPA, so there’s no large payment due to make the switch — the $18,000–$54,000 sticker price above isn’t what you pay upfront.
- ✓Lock in your rate. Once your system is installed, your cost for the power it produces is fixed by contract — it doesn’t move every time ComEd or Ameren raises rates.
- ✓Utility rebate checks, on top of that. ComEd and Ameren Illinois pay $300 per kW of system size plus $300 per kWh of battery capacity — a check paid directly to you, typically within about 90 days of activation, separate from any Lease/PPA or loan terms. Depending on your system size and whether you add battery storage, that can add up to roughly $4,000–$12,000. Your specific eligible amount is confirmed for your system before you sign anything — treat it as an amount you may qualify for, not a guarantee.
- ✓Add battery backup. Keep essentials running through an outage, and a battery may also qualify your system for the additional rebate above.
- ✓Some homeowners see savings from day one. Depending on your current rate, usage, and system size, your new solar payment can start out lower than what you’re paying the utility today. We won’t promise that for every home — we’ll show you your actual numbers before you decide anything.
Two Ways to Go Solar in Illinois
Since the federal tax credit ended for cash and loan purchases in 2026, most Illinois homeowners we work with are choosing a $0-down Lease or PPA instead. Here’s an honest look at both.
$0-Down Lease or PPA
A financing partner owns the system; you use the power it produces.
- ✓$0 due at signing, no cash outlay
- ✓The financing company, not you, claims the federal commercial credit and passes savings through in your rate
- ✓Bumper-to-bumper warranty and a production guarantee for the full term (LightReach)
- ✓No 25D federal credit to lose — this path was never counting on it
Cash or Loan Purchase
You own the system and everything it produces, from day one.
- ✓Full ownership of the system and its RECs
- ✓You can choose to sell your RECs into Illinois Shines yourself
- ✗No federal tax credit — Section 25D ended for systems placed in service after 12/31/2025
- ✗Full $18k–$54k cost due upfront or financed by you
What Actually Drives Your Price
System size, sized to your real usage
The single biggest cost driver is how many kilowatts you need, and that’s a function of your actual annual kWh usage from your ComEd or Ameren Illinois bill — not a generic package size. A household using 9,000 kWh/year needs a meaningfully smaller system than one using 15,000 kWh/year. We size every proposal off your real usage, not a rule of thumb.
Roof complexity
A simple south-facing roof with one pitch is the cheapest surface to install on. Multiple roof planes, steep pitch, shading from trees, or an older roof that needs work first all add labor and equipment cost. This is confirmed during your site assessment, not guessed from a satellite photo.
Equipment tier
Panel efficiency, inverter type (string vs. microinverter), and whether you add battery storage all move the price. Higher-efficiency panels cost more per watt but can fit more capacity on a smaller roof — which matters if your roof space is limited.
Ameren Illinois vs. ComEd interconnection
Your utility affects both the paperwork and the rebate math. Ameren Illinois customers choose between kWh usage netting or monetary value netting at signup (a permanent choice), while ComEd requires enrollment in its hourly Rate BESH pricing to qualify for the battery rebate. We handle the filing either way, but it does change what your proposal looks like.
What Illinois Homeowners Can Subtract
The fastest path: a $0-down Lease or PPA
For most Illinois homeowners in 2026, the biggest “subtraction” isn’t a rebate at all — it’s skipping the upfront cost entirely. With a Lease or PPA, the financing company owns the system and can still claim the separate federal commercial solar credit (Section 48E), which is part of how they’re able to offer $0-down terms. You never touch the $18,000–$54,000 sticker price. We’ll walk through exactly what your specific contract includes before you sign anything.
One-time ComEd and Ameren Illinois rebates
Both utilities offer a one-time Distributed Generation rebate of $300 per kW of installed capacity (a 6 kW system works out to roughly $1,800), plus a separate battery storage rebate of $300 per kWh of battery capacity. For a typical home battery around 13.6 kWh, that battery rebate may work out to about $4,080 — eligibility depends on your system, your utility’s current program terms, and enrollment requirements (ComEd requires its hourly Rate BESH pricing program), so treat that figure as an amount your system may qualify for, not a guarantee, confirmed for your specific setup before you sign anything.
Illinois Shines: a REC sale, not a rebate
Illinois Shines (the Illinois Power Agency’s Adjustable Block Program) doesn’t hand you a rebate check. It’s a 15 to 20-year forward sale of the Renewable Energy Certificates (RECs) your system will generate. An Approved Vendor buys that REC value and typically builds it into your project price, loan terms, or Lease/PPA rate upfront. SolQ is a registered Illinois Shines Designee working under multiple Approved Vendors — not an agency of the State of Illinois or the Illinois Power Agency, and not affiliated with or endorsed by either. We confirm the current terms from the live Illinois Shines dashboard as part of every proposal rather than quoting one fixed number here.
If you own outright: what’s true about the federal credit
The 30% federal Residential Clean Energy Credit (Section 25D) ended for cash or loan purchases placed in service after December 31, 2025. If you’re buying your system outright in 2026, that federal credit no longer applies — we won’t tell you otherwise. It’s one of the main reasons more Illinois homeowners are choosing the Lease/PPA path this year instead.
The Cost of Doing Nothing
Illinois electricity rates have moved in one direction for years, and nothing in the current data suggests that changes. Per the Citizens Utility Board’s own 2026 rate report, ComEd’s residential supply price ran 9.66¢/kWh for January–May 2026, about 47% higher than January 2025, and Ameren Illinois’s supply price ran 8.769¢/kWh for the first 800 kWh of usage, about 6% higher than a year earlier. Delivery charges rose too: the Illinois Commerce Commission approved a $243 million ComEd delivery rate increase and a $48 million Ameren Illinois increase, both effective this year. CUB attributes part of the run-up to summer 2025 supply prices that jumped roughly 50%, driven in part by rising data-center electricity demand across the grid — a demand driver that isn’t going away anytime soon.
We can’t tell you exactly what ComEd or Ameren Illinois charges next year — nobody honestly can, since that depends on regulatory decisions outside anyone’s control. What we can say is this: every year you wait is another year of paying whatever number they set, with no ceiling and no say in it. Locking in your own generation now, at a fixed cost, is how a lot of Illinois homeowners are choosing to opt out of that guessing game.
Get Your Exact Number, Free
A written estimate based on your real usage, your roof, and your utility — including whether a $0-down Lease/PPA or a cash/loan purchase makes more sense for you. No obligation.
Get Your Free EstimateFrequently Asked Questions
Should I lease solar or buy it with cash in Illinois?
Most Illinois homeowners we work with in 2026 choose a $0-down Lease or PPA, mainly because the federal tax credit for cash/loan purchases ended for systems placed in service after December 31, 2025. Leasing means no upfront cost and a financing company assumes the equipment risk; buying means full ownership, but the full $18,000–$54,000 cost is on you, without that federal credit to offset it. There’s no universally “right” answer — we’ll show you the real numbers for both before you decide.
How much do solar panels cost for a 2,000 sq ft home in Illinois?
A 2,000 sq ft home doesn’t have a single fixed answer, because your system is sized to your electricity usage, not your square footage. Most homes this size land in the 6–10 kW range, or roughly $18,000–$45,000 before incentives at current $3.00–$4.50/W pricing. Most homeowners cover this with a $0-down Lease or PPA rather than paying it upfront. We’ll give you an exact number from your actual utility usage.
Is solar worth it in Illinois?
It depends on your roof, your usage, and how long you plan to stay in your home — there’s no honest one-size-fits-all yes. What we can say factually: Illinois electricity rates have risen meaningfully in 2026 on both ComEd and Ameren Illinois, and a $0-down Lease/PPA plus Illinois Shines RECs and one-time utility rebates can make the math work for many homeowners without any upfront cost. We’ll walk through your specific numbers before you decide anything.
How much does solar cost per month?
With a $0-down Lease or PPA, there’s no upfront cost, and you pay for the power the system produces under your specific contract terms, which we review with you in full before you sign anything. If you finance a purchase with a loan instead, your monthly payment depends on the loan amount, term, and rate quoted specifically for your system — we don’t publish a generic monthly figure because it varies too much to be honest.
Do solar panels increase home value?
Multiple industry studies (Zillow and the U.S. Department of Energy’s Lawrence Berkeley National Lab among them) have found owned solar systems are associated with a home value premium in many markets, though the size of that premium varies by region and isn’t guaranteed for every property. Leased systems and PPAs typically transfer differently at resale than owned systems, since the buyer would need to assume the remaining contract. We’ll walk you through how your specific financing choice affects this.
Learn more about SolQ’s Illinois solar installation coverage or read our full Illinois & Iowa solar tax credit and incentive guide for the complete, verified breakdown of what still applies in 2026.
Pricing figures on this page ($/watt, typical system cost, typical system size) are general 2026 market information for Illinois residential solar, not a quote for your home; your actual price depends on your usage, roof, and equipment choices and is confirmed in a written, site-specific estimate. SolQ is an independent solar provider and a registered Designee under multiple Approved Vendors participating in Illinois Shines. SolQ is not affiliated with, endorsed by, or acting on behalf of the State of Illinois, the Illinois Power Agency, the Illinois Commerce Commission, ComEd, Ameren Illinois, or any government agency. “Illinois Shines” and the Adjustable Block Program are administered by the Illinois Power Agency and its program administrator, not by SolQ; REC pricing and block capacity are set by the program administrator and change over time. Solar RECs are compensation for your system’s environmental attributes, not a rebate on the equipment itself, and selling them does not make a system “free.” ComEd and Ameren Illinois one-time Distributed Generation and battery storage rebates are utility programs with their own eligibility rules; your system may qualify, subject to confirmation at the time of your proposal. The federal residential solar tax credit (Section 25D) ended for cash/loan purchases completed after December 31, 2025; a separate credit may apply to third-party-owned Lease/PPA systems through 2027. Electricity rate figures are sourced from the Citizens Utility Board’s public 2026 rate reporting and are subject to change by regulatory action. Financing offered through third-party partners (LightReach for Lease/PPA, Salal Credit Union for loans); terms are disclosed in your specific agreement and subject to partner approval. Content verified as of September 2026.