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How Much Does a Solar Lease Cost Per Month in Illinois? (2026)

Ryan Cook•June 19, 2026•Updated Sep 13, 2026

"How much is a solar lease per month?" might be the question I hear most. The honest answer is the one nobody likes: it depends. But that's a cop-out unless I show you what it depends on. Let's put real Illinois numbers to it.

The Short Answer

Most solar leases in Illinois aren't a flat fee. They're priced by what your system produces, as low as $0.10 per kWh, with $0 down.

What that becomes per month depends on three things: how big your system is, how much sun your roof gets, and how much electricity you use. A household paying $180–$220 a month to ComEd or Ameren Illinois today often sees a lease payment land in a similar range. Sometimes lower. The difference that matters isn't the starting number. It's that the lease rate is predictable for 25 years — the full schedule is set in your contract before you sign — while your utility rate keeps climbing.

Want a real figure for your address instead of a range? Run your numbers in the calculator →

Why "It Depends" Is Actually the Point

A 6 kW system in sunny southern Illinois produces more than the same system under cloudier northern skies, so the monthly cost shifts with your roof. A bigger home that runs central air all summer needs more panels than a tidy ranch. That's why a national site quoting "$79 a month" can mislead you. It's their cheapest example, not your house.

Here's the comparison that actually matters. Your utility bill is a rate you rent, and the landlord raises it almost every year. Ameren and ComEd rates are up roughly 90% over five years, and both utilities have more increases lined up. Your lease rate is set in writing before you sign, so you know exactly where it's headed. So even if month one looks similar, month one of year ten won't. See the full Ameren rate history and ComEd rate history for how steep that climb has been.

Line chart comparing a predictable solar lease payment schedule over 25 years against a utility bill that climbs each year, with the widening gap shaded as savings

What You're Actually Paying For

A lease payment in Illinois usually bundles a lot more than panels:

The equipment and installation — no upfront cost to you
Monitoring, maintenance, and repairs for the full term, since the company owns the system
Battery backup, included on many plans or available for a modest additional monthly amount, so essential circuits stay on during an outage
A transfer option — if you sell your home, the agreement is easily transferable, usually in minutes, not months

What you're not paying for is ownership. You don't get the panels' resale value, or the very-low-cost power years a cash buyer eventually reaches. That's the trade. No upfront cost and a hands-off term, in exchange for the long tail of ownership.

The One Thing to Check Before You Sign: Escalators

If you take one thing from this page, make it this. Some national leases include an annual escalator that raises your payment every single year — and it's often buried in the fine print, so you don't find out until you're a few years in. The plans I work with do it differently: the entire 25-year rate schedule goes in your contract before you ever sign, so you know exactly what year twenty-five looks like on day one.

That's not a small detail. A hidden escalator quietly recreates the rising-cost problem you went solar to escape. When you compare offers, ask straight out: Can I see the full rate schedule in writing? Predictable, with no surprises, is worth real money over the life of the contract.

How It Stacks Against Buying

For a quick gut check on the bigger decision, here's the structure:

	$0-Down Lease	Cash Purchase
Upfront cost	$0	$20,000+
Monthly payment	Predictable, as low as $0.10/kWh	None after purchase
Federal value in 2026	Reflected via system owner	Homeowner credit ended Dec 2025
SREC payments	Held by owner	You keep them
Maintenance	Included	Your responsibility
Best for	Low upfront cost, simplicity	Long-term return, ownership

If you want the deeper side-by-side, I wrote a full breakdown here: solar lease vs. buying panels in Illinois.

My Take

When people ask me for the monthly number, what they're really asking is, "Will this actually save me money, or is it a gimmick?" Fair question.

The way I look at it, a lease isn't about a magic low payment. It's about trading a utility rate that rises unpredictably for a rate schedule you can read in your contract before you ever sign. In an Illinois that just saw rates jump again this summer, that trade has gotten a lot more attractive, especially now that buying no longer comes with the 30% federal credit.

The only way to know your real number is to look at your actual roof and bill. Check if your roof qualifies in about a minute, or grab a free estimate and I'll get you a straight answer. No pressure, no national-average guesswork.

Ryan Cook is the founder of Ltd Solar Consulting, helping Illinois homeowners compare solar options across Ameren and ComEd territory. Get your monthly number or call (618) 217-2001.

Interactive Tool

Calculate Your Solar Savings

Enter your monthly electric bill for an instant lease-vs-utility estimate built on your numbers — not a national average.

$Enter Your Information

Average Monthly Electric Bill

Current Utility Rate ($/kWh)

Default: $0.16/kWh (ComEd & Ameren average)

Utility Rate Escalator: 4.5% per year

Conservative (2%)Historical Average (6%)Aggressive (10%)

How We Calculate Your Savings

This calculator uses your custom utility rate (default $0.16/kWh for Illinois) with a 4.5% annual escalator compared to our lease rate as low as $0.10/kWh (est.) plus battery backup for 25 years, with the full rate schedule set in your contract. After the 25-year lease, you can keep the system for a low fair-market buyout — then your electricity cost drops to near-zero for the remaining life of the panels. Your actual savings may vary based on your specific usage patterns and system size.

Frequently Asked Questions

Most Illinois solar leases are priced by what you produce, not a flat fee — as low as $0.10 per kWh, with no money down. What that turns into per month depends on your system size and how much sun your roof gets. A home that currently pays $180–$220 a month to the utility often sees a lease payment in a similar or lower range, with the key difference being that the lease rate is predictable for 25 years — the full schedule is set in your contract before you sign — while the utility rate keeps climbing. Some plans bundle battery backup for an added monthly amount. The honest answer is that there's no single price, because your roof, your usage, and your utility all change the number. A five-minute estimate gives you a real figure for your address instead of a national average that won't match your bill.

Yes — a true $0-down lease means no upfront cost to put panels on your roof. You're not buying the equipment, so there's no large check, no loan, and no down payment. The company that owns the system installs and maintains it, and you pay a monthly amount for the power it produces. That's the trade-off: you give up ownership and the long-term return that comes with it, in exchange for immediate savings and zero upfront risk. Maintenance, monitoring, and most repairs are handled by the owner during the term. For homeowners who don't want to spend $20,000-plus on a cash system — especially now that the federal homeowner tax credit has ended — a $0-down lease is often the most practical way to get a lower, predictable electricity rate without touching savings.

A typical Illinois lease bundles more than just panels. The monthly payment generally covers the solar equipment, installation, system monitoring, maintenance, and repairs for the length of the term — usually 25 years. Many plans also include battery backup, either built into the rate or for a modest additional monthly amount, which keeps essential circuits running during an outage. Because the leasing company owns the system, they carry the responsibility for keeping it producing, so you're not on the hook for a failed inverter or a panel issue down the road. What's not included is ownership — you don't get the equipment's resale value or the long-term low-cost-power years a cash buyer eventually reaches. For a lot of homeowners, trading that long tail for no upfront cost and a worry-free term is a fair deal.

This is the single most important thing to check before you sign. Some national solar leases include an annual escalator that raises your payment every year — and the number is often buried in the fine print, so you don't find out until year three or four. The plans I work with in Illinois do it differently: the entire 25-year rate schedule is put in writing before you ever sign, so you know exactly what your payment looks like in year one and what it looks like in year twenty-five. No guessing, no surprise letter in the mail. When you compare lease offers, ask directly: can I see the full rate schedule in writing? If a salesperson can't produce it, that tells you something. Always read the term before you sign.

Per month, a lease and a financed purchase often land close, but the structure is different. A $0-down lease usually has the lowest barrier — no upfront cost, a predictable monthly rate, maintenance included — and it still reflects federal value through the company that owns the system. A loan-financed purchase may have a similar monthly payment, but you own the panels, keep the SREC payments, and eventually reach years of very low-cost power once the loan is paid off. Paying cash removes the monthly payment entirely but ties up $20,000-plus upfront, and as of 2026 a cash buyer no longer gets the 30% federal homeowner credit. So 'cheaper per month' usually favors the lease early on, while ownership wins over the long haul. The right pick depends on whether you value low upfront cost or long-term return.