- Complete Illinois Solar Guide Resource · 2026 -
The Illinois Solar Guide: Everything You Need to Know
Illinois solar incentives, programs, utility guidance, battery storage, financing, and honest answers – all in one place. Written specifically for Illinois homeowners before they speak with any installer.
Illinois Shines
Ameren & ComEd
Battery storage
City guides
$10,000+
Avg. IL Shines value
5 Options
Federal tax Lease, PPA, loan, cash, battery
~34%
Ameren rate increase
850+
IL homes reviewed
- Illinois Solar Guide Start here
Is Solar Worth It in Illinois in 2026?
For many Illinois homeowners, the honest answer is yes – but it depends on your specific home, utility, and financial situation. Here is what actually determines whether solar makes sense for you.
Illinois has one of the most favorable state-level solar environments in the Midwest. The combination of Illinois Shines SRECs and Ameren and ComEd net metering can significantly reduce the effective cost of going solar – and the right financing option (lease, PPA, loan, or cash purchase) can meaningfully improve your long-term financial picture.
At the same time, solar is not the right financial decision for every homeowner. Roof orientation, shading, your electric bill size, your utility provider, and your federal tax situation all play a role. That is why we always recommend an independent energy review before calling any installer – so you go in knowing your actual numbers, not an installer’s estimate of them.
How to use this guide: Each section covers one aspect of Illinois solar in depth. Use the sticky jump navigation to skip to what matters most for your situation. Every section links to a dedicated deep-dive page on our site for even more detail.
- Why 2026 Is a Critical Evaluation Window
- Illinois Shines SREC values are proposed to increase 34–43% for 2026 - homeowners who enroll now lock in higher values for their full 15-year contract
- Ameren and ComEd rates have risen 29–34% since 2019 — the economics of solar are more compelling than at any point in the past decade
- Illinois net metering changed in January 2026 - many savings estimates circulating online are based on the old policy and are no longer accurate
- No single option is automatically best - lease, PPA, loan, and cash purchase each have different tradeoffs, and the right fit depends on your goals, not a generic recommendation
- State Program
Illinois Shines Program (SREC-II)
Illinois Shines (SREC-II) is the state’s flagship solar program and one of the strongest state-level solar incentives in the Midwest. Understanding it is essential before evaluating any solar quote.
When your solar system generates electricity, it also creates Solar Renewable Energy Credits (SRECs) – one SREC per megawatt-hour (MWh) of clean energy produced. Illinois law requires Ameren and ComEd to purchase these SRECs from eligible homeowners at a fixed price over a 15-year contract.
This income is entirely separate from your electricity bill savings. Illinois Shines creates a long-term revenue stream from the environmental value of your clean energy – stacked on top of everything else a solar system provides.
- How It Works
How It Works
$10,000+
When your solar system generates electricity, it creates SRECs. Illinois utilities are required by state law to purchase these credits from eligible homeowners over a 15-year contract - creating long-term income on top of your bill savings.
- 15-year fixed-price SREC purchase contract
- Predictable long-term income stream
- Available to homeowners who own their system (loan or cash purchase)
- Must be enrolled through an IL Shines approved vendor
- 2026 Update
SREC Values Increasing
+34–43%
The Illinois Power Agency has proposed significant SREC value increases for the 2026 program year - making this one of the most favorable times to evaluate Illinois Shines eligibility for your home.
- Must be in Ameren or ComEd service territory
- New installations only - not previously installed systems
- Homeowner must own the system (not lease)
- Enrollment slots can fill - timing matters
- Slot availability warning: Illinois Shines enrollment slots are allocated by utility territory and program year. ComEd territory slots fill faster. If you are considering solar, checking your Illinois Shines eligibility sooner rather than later is important.
Check Your Illinois Shines Eligibility
Our free energy review includes a full Illinois Shines eligibility assessment – including current SREC values for your specific utility territory.
- Illinois Utilities
Ameren & ComEd Solar Programs
Illinois has two major residential utility providers. Understanding how each handles solar customers is critical for accurate savings projections.
Ameren Illinois
Central & Southern Illinois
Service Area
Central & Southern IL
Rate Increase Since 2019
~34%
Illinois Shines Eligible
✓ Yes
Net Metering
✓ Yes
SREC Slot Availability
More available
Dedicated Page
ComEd
Northern Illinois & Chicago Metro
Service Area
Northern IL / Chicago
Rate Increase Since 2019
~29%
Illinois Shines Eligible
✓ Yes
Net Metering
✓ Yes
SREC Slot Availability
Fills faster
Dedicated Page
- Utility Policy
Net Metering in Illinois:
What Changed in 2026 and Why It Matters
Net metering determines how you are credited for excess solar electricity sent to the grid. A significant Illinois policy change took effect January 1, 2026 – and most online savings calculators have not been updated to reflect it.
When your solar panels produce more electricity than your home is currently using, the surplus flows back to the grid. Under net metering, your utility meter tracks this export — and at billing time you receive credits that offset the electricity you drew from the grid. You pay only for the net difference.
- 2026 Net Metering Change: Illinois transitioned to a supply-only net metering model for new installations as of January 1, 2026. Credits for exported solar are now calculated at the supply rate rather than the full retail rate. Our energy reviews reflect this current policy - older savings estimates you may have seen may not.
- What This Means for Your System Design
Under the new policy, it is more financially efficient to design your system to maximize self-consumption — using your solar energy in real time — rather than over-producing and exporting at reduced credit rates. Most well-designed 2026 Illinois systems should target covering roughly 80–90% of annual usage rather than 120%+.
Adding battery storage is one way to address this change — storing excess daytime solar for evening use rather than exporting it to the grid at lower rates. This is particularly relevant under the new Illinois policy.
Both Ameren and ComEd now operate under supply-only net metering for new installations. Our free energy reviews use current 2026 rules – so your projected savings accurately reflect how Illinois net metering actually works today.
- Why this matters for installer quotes: Some installers are still using pre-2026 net metering assumptions in their savings projections. If you receive a quote that does not mention the January 2026 net metering change, ask specifically how they accounted for it. Our independent energy review uses current rules and flags this issue proactively.
- Battery Storage
Home Battery Backup in Illinois
Battery storage is increasingly discussed alongside solar in Illinois — but it is not always the right financial decision. Here is an honest breakdown.
Power During Outages
Keep lights, refrigerator, medical equipment, and internet running when the grid goes down. Illinois has seen increasing storm-related outages in recent years.
Time-of-Use Rate Savings
If your utility charges higher rates during peak demand hours, a battery lets you use stored solar energy during those windows — reducing what you pull from the grid when electricity costs the most.
Net Metering Optimization
Under Illinois's current supply-only net metering, a battery helps you use more of your own solar generation rather than exporting at reduced credit rates.
Battery Incentives Available
Batteries installed with solar may qualify for Illinois utility rebates of $250+ depending on your territory and configuration, plus any applicable program incentives at the time of installation.
- Do you need a battery? Not necessarily. If backup power is your priority, yes. If monthly bill reduction is the goal, solar alone may be sufficient. Our free review covers both scenarios - including current Illinois battery incentives and whether the math works for your home.
- Financing Options
How Illinois Homeowners Finance Solar
Three financing structures exist — each with meaningfully different outcomes. Understanding these before an installer presents them is one of the most important things you can do.
- Loan
Solar Loan
You own the system and spread the cost over monthly payments. Loan payments are often offset by electricity bill savings, and owned systems may qualify for Illinois Shines SREC income. A good fit for homeowners who want ownership without a large upfront cost.
- Full ownership
- Illinois Shines SREC eligible
- Monthly payment required
- Total cost depends on loan terms
- Cash
Cash Purchase
You own the system outright with no monthly payment. Highest upfront cost, but no financing involved and full eligibility for Illinois Shines SRECs. A good fit for homeowners prioritizing long-term value who can pay upfront.
- Full ownership
- No monthly payment
- Largest upfront cost
- Read carefully
Lease / PPA
A solar company installs and owns the system; you pay a fixed monthly amount, typically lower than your current electric bill. No upfront cost and no ownership responsibility - a good fit for homeowners who want predictable payments without owning the system.
- No upfront cost
- Installer retains ownership & SRECs
- May affect terms at home sale
- There's no universally "best" option. Lease and PPA offer no upfront cost and predictable payments but don't include Illinois Shines SREC income, since the installer retains system ownership. Loan and cash purchase mean you own the system and may qualify for SRECs, but come with either monthly payments or a larger upfront cost. The right choice depends on your budget, how long you plan to stay in your home, and whether ownership matters to you. Our free energy review walks through all four options with your specific numbers - and Illinois Shines eligibility status - so you can decide what fits.
- Home Assessment
Does My Home
Qualify for Solar?
Not every home is a strong solar candidate. Here are the six key factors that determine whether solar makes financial sense for your Illinois home.
Roof Orientation
South-facing roofs are ideal. East or west-facing roofs still work but produce 15–20% less. North-facing roofs are generally not recommended for solar in Illinois.
- Site evaluation needed
Shading & Roof Condition
Trees, chimneys, and neighboring structures reduce output. If your roof needs replacement within 5–7 years, address it first or combine it with the solar project.
- Physical inspection needed
Electricity Usage & Bill
Higher monthly bills mean better solar economics. Homes paying more than $100/month to Ameren or ComEd typically see the strongest financial returns in Illinois.
- Bills needed for analysis
Your Financing Goals
Whether ownership (loan/cash) or no-upfront-cost options (lease/PPA) make more sense depends on your budget, tax situation, and how long you plan to stay in your home. There's no universal right answer.
- Goals review recommended
Utility Provider
Both Ameren and ComEd territories are eligible for Illinois Shines, but SREC values and slot availability differ. Knowing your utility and rate structure is essential for accurate projections.
- Utility bill needed
Ownership vs. No Upfront Cost
Owning your system (loan or cash) may qualify you for Illinois Shines SRECs. Leasing or a PPA means no upfront cost and predictable payments, with the installer retaining ownership. Both are valid paths depending on your priorities.
- Financing decision needed
- Illinois's strongest solar candidate: South-facing roof in good condition, Ameren or ComEd customer paying $150+/month, federal tax liability, and a clear sense of which financing structure — own or lease — fits your goals. Our free review tells you exactly where your home stands across all six factors.
- Related Resources
Keep Exploring
Illinois Shines
How Illinois Shines SRECs work, what they're worth, and how to enroll before slots fill.
Ameren Solar
Solar guide for Ameren customers in central and southern Illinois.
ComEd Solar
Solar guide for ComEd customers in northern Illinois and the Chicago metro area.
Battery Backup
Home battery storage incentives, honest guidance, and whether battery makes sense for your home.
Ready to see your actual numbers?
Free Illinois Solar Report – personalized to your home, your utility, and your situation.
Illinois Solar FAQs: Honest Answers
The questions we get most often - including the ones solar companies sometimes avoid.
- Local solar guidance
Illinois communities we serve
Each city page covers local utility rates, available incentives, savings examples for that area, and city-specific FAQs.
