Updated: August 29, 2026 · Estimated read time: 8 minutes
You’ve seen the solar panels going up around Illinois.
Maybe your neighbor installed them. Maybe your electric bill keeps creeping higher. Or maybe you've received a solar quote and stared at numbers like kW, kWh, offset, RECs, PPA, and production wondering:
“Okay... but is this actually a good deal?”
That's a reasonable question.
Going solar can be a major financial decision, and the biggest system isn't necessarily the best system. Before signing anything, there are a few things every Illinois homeowner should understand.
Here are 7 things to check before going solar in 2026.
1. Start With Your Electric Bill — Not the Solar Panels
Use your recent bills as the starting point, then review how Illinois electricity costs and solar fit together.
One of the biggest mistakes homeowners can make is starting with:
“How many panels can fit on my roof?”
That's not the first question.
The better question is:
“How much electricity does my home actually use?”
Look at your last 12 months of electricity usage and find your total annual consumption in kilowatt-hours (kWh).
Why 12 months?
Because electricity usage changes dramatically throughout the year.
Your air conditioner may work overtime in July while your electricity consumption could look completely different in October.
A single month's bill doesn't tell the whole story.
For example, imagine your home consumes:
12,000 kWh per year.
Your solar system should be designed around that consumption, your roof's solar potential, expected panel production, utility rules, and your future energy needs.
Think about the future, too.
Are you planning to:
- Buy an electric vehicle?
- Install a pool?
- Add a hot tub?
- Finish your basement?
- Switch appliances from gas to electric?
- Add another refrigerator or freezer?
- Install a heat pump?
- Have family members moving into the home?
Your future home may consume more electricity than your home does today.
A good solar design should consider that possibility.
2. Check Your Roof Before Putting a 25+ Year System on It
Also compare the proposed panels, inverters and warranties using LuNova's solar equipment guide.
Solar panels are designed to stay on your roof for a long time.
Your shingles might not be.
Before installing solar, ask yourself:
How much life does my roof have left?
If your roof may need replacement in the near future, installing solar first could mean paying later to remove and reinstall the panels when the roof is replaced.
That's an expense homeowners sometimes overlook.
Check:
- Roof age
- Shingle condition
- Previous leaks
- Storm or hail damage
- Structural concerns
- Trees hanging over the roof
If you're unsure, getting the roof inspected before installing solar can be worthwhile.
And don't forget the trees.
That beautiful 40-foot maple tree might provide great afternoon shade.
Unfortunately, your solar panels don't necessarily appreciate it.
Shade can affect solar production, so tree coverage should be considered when estimating how much electricity your system can realistically generate.
3. Understand What “Solar Offset” Actually Means
Annual offset does not explain when electricity is produced or used; LuNova's Illinois net-metering guide explains why that timing matters.
This is one of the most important numbers on your solar proposal.
If your home consumes 10,000 kWh per year and your solar system is projected to generate 10,000 kWh, that's approximately:
100% annual energy offset.
If it generates 11,000 kWh:
110% offset.
Sounds simple.
But here's where things get interesting.
110% isn't automatically the “perfect” number.
Your ideal system might be 90%, 100%, 110%, or something else entirely.
It depends on factors such as:
- Available roof space
- Shading
- Utility rules
- Solar economics
- Expected future electricity consumption
- Financing structure
- Your budget
- Whether you're adding an EV or other major electrical loads
A homeowner planning to buy two EVs could have very different future electricity needs than someone whose household consumption is likely to decrease.
Solar should be designed around the homeowner—not around an arbitrary percentage.
4. Understand Illinois Solar Incentives Before Comparing Prices
Verify current programs through LuNova's 2026 Illinois incentives guide and the official sources linked there.
This is especially important in Illinois.
Illinois has its own solar incentive structure, including the Illinois Shines program.
Eligible residential solar projects can potentially generate value through Renewable Energy Credits, commonly called RECs.
That can significantly affect the economics of a solar project.
But there's an important distinction:
An incentive isn't necessarily an instant discount.
Homeowners should understand:
- Who receives the incentive?
- How is its value calculated?
- When is it paid?
- Is it included in the quoted price?
- Does the homeowner need to meet any requirements?
- What happens if the system produces differently than expected?
Under current IRS guidance, the former federal Residential Clean Energy Credit is not available for residential clean-energy property placed in service after December 31, 2025. Illinois programs such as Illinois Shines remain separate from that federal credit, and homeowners should confirm project-specific tax treatment with a qualified tax professional.
Tax incentives should never simply be presented as guaranteed cash.
Ask exactly how every incentive shown on your proposal works.
Programs, incentive values, tax rules, and eligibility requirements can change, so verify current information before making a financial decision.
5. Don't Compare Solar Quotes Using Monthly Payment Alone
Compare cash, loans and PPAs using LuNova's Illinois solar financing guide.
Here's a scenario.
Company A: $189/month
Company B: $229/month
Which is cheaper?
It looks obvious.
But you actually don't have enough information.
Company A might have:
- A longer financing term
- A different interest rate
- A smaller system
- Lower projected production
- An escalator
- Different equipment
- Different warranties
- Different financing costs
Meanwhile, Company B could include more production or completely different financing terms.
Compare the entire proposal.
Look at:
System size
How many kilowatts (kW) is the system?
Estimated annual production
How many kilowatt-hours (kWh) should it produce?
Energy offset
How much of your current electricity consumption is expected to be covered?
Equipment
What panels, inverter, and batteries are included?
Total project cost
Not just the monthly payment.
Financing terms
How long are you paying?
Escalator
Does your payment or energy price increase every year?
Once you compare those numbers, two seemingly similar solar quotes can suddenly look very different.
6. Decide Whether You Actually Need a Battery
Review backup limitations, capacity and rebate considerations in LuNova's Illinois battery guide.
Solar batteries are exciting.
During a power outage, having stored electricity available can be extremely valuable.
But that doesn't mean every homeowner automatically needs one.
A battery might make sense if:
- Backup power is important to you
- Your area experiences outages
- You want greater energy independence
- You have critical electrical loads
- Your utility rate structure makes energy storage valuable
But batteries also increase project cost.
If your primary objective is simply maximizing your financial return from solar, it may be worth comparing:
Solar only
versus
Solar + battery
Ask what you're actually getting for the additional investment.
And here's an important question:
What exactly will the battery power during an outage?
“One battery” does not automatically mean your entire house will operate normally for days.
Air conditioners, electric dryers, ovens, EV chargers, well pumps, and other large loads can consume substantial amounts of power.
Make sure you understand what your backup system is actually designed to do.
7. Ask the Question Solar Salespeople Don't Always Lead With
Before signing a solar contract, ask:
“What happens if I don't go solar?”
This puts the decision into perspective.
Suppose your electricity bill averages $200 per month today.
That's:
$2,400 per year.
Over 10 years, that's $24,000 even if electricity prices never increase.
Over 20 years:
$48,000.
And that's assuming your cost never changes.
Of course, nobody can predict exactly what electricity will cost 10 or 20 years from now.
That's precisely the point.
When evaluating solar, don't only compare:
Solar vs. $0.
Compare:
The long-term cost of staying with the utility
versus
The long-term cost of your solar option.
That's a much more useful comparison.
One More Thing: Don't Let Anyone Rush You
“You have to sign tonight.”
“The incentive disappears tomorrow.”
“This price is only available while I'm sitting here.”
Those statements should make you slow down—not speed up.
Solar is a major home improvement and financial decision.
You should understand what you're buying.
Ask questions.
Read the proposal.
Understand the financing.
Check the warranties.
Research the equipment.
Verify the incentives.
And if something doesn't make sense?
Ask again.
A trustworthy solar professional shouldn't be afraid of an informed homeowner.
So, Is Solar Worth It in Illinois in 2026?
For some Illinois homeowners, solar can make a lot of sense.
For others, the numbers may not work yet.
And that's okay.
The answer depends on your electricity consumption, utility, roof, solar exposure, available incentives, financing, equipment, and long-term plans for the home.
That's why we don't believe solar should begin with:
“How many panels can we sell you?”
It should begin with:
“What does your home actually need?”
Find Out What Solar Could Look Like for Your Home
At LuNova Solar, our goal is to help Illinois homeowners understand the numbers before making a decision.
Instead of automatically targeting an arbitrary system size or offset percentage, your solar estimate should consider your historical electricity consumption, your home's solar potential, and reasonable changes in your future energy needs.
Because the best solar system isn't necessarily the biggest one.
It's the one that makes sense for your home.
Ready to see your numbers?
Start with your home and electricity usage in LuNova's preliminary solar estimator.
No pressure. No confusing sales pitch. Just a clearer look at whether solar makes sense for your home.
LuNova Solar
Power your home. Understand your energy.
Related Illinois Solar Guides
Sources & References
- U.S. Department of Energy — Step-by-Step Guide for Consumers Going Solar — roof, usage, quotes and installation planning
- Illinois Shines — Consumer Protection Support — Illinois disclosure, complaint and consumer resources
- CWLP — What to Know Before Going Solar — Springfield-specific consumer guidance