Solar panels in Washington, IL
See what solar could save your Washington home with the Ameren solar rebate, Illinois Shines incentives and $0-down options. Free, no-obligation quotes from installers serving Tazewell County.
Free, no-obligation quotes. Savings vary by home and utility. $0-down offers are leases or PPAs and are subject to approval.
Quick answer
Is solar worth it in Washington, IL?
For many homes, yes. With a $150 monthly bill, we estimate a 7.6 kW system costs about $11,400 after the Ameren rebate and Illinois Shines and pays for itself in about 9 years. Panels in Washington produce roughly 1,240 kWh per kW each year on an unshaded, south-facing roof.
How much does solar cost and save in Washington?
- Electric utility
- Ameren
- County
- Tazewell County
- Population (2020)
- about 16,000
- Solar output per kW
- ~1,240 kWh/year
- System for a $150/mo bill
- ~7.6 kW (19 panels)
- Est. utility rebate
- $2,280
- Est. Illinois Shines value
- $9,900
- Est. net cost / payback
- $11,400 / ~9 yrs
Estimates for a cash purchase on an unshaded, south-facing roof with a $150 monthly bill. Your roof and rate plan will change the numbers. How we estimate
What would a solar estimate look like for a Washington home?
Estimates for Washington homes at four common bill sizes. Bigger bills need bigger systems that cost more up front, but payback stays about the same, because the Ameren rebate and Illinois Shines grow with system size too. Systems over 10 kW get somewhat different Illinois Shines prices, so treat the largest size as a rough guide. For prices by system size, see how much solar costs in Illinois.
| Monthly bill | System size | Panels | Roof space | Cost after incentives | Payback |
|---|---|---|---|---|---|
| $100/mo | 4.8 kW | 12 | ~250 sq ft | $7,200 | 9 yrs |
| $150/mo | 7.6 kW | 19 | ~400 sq ft | $11,400 | 9 yrs |
| $200/mo | 10.4 kW | 26 | ~550 sq ft | $15,500 | 8.9 yrs |
| $300/mo | 16.4 kW | 41 | ~860 sq ft | $24,400 | 8.9 yrs |
How does solar work with Ameren in Washington?
Washington is a Peoria-area city of mostly single-family homes, including neighborhoods rebuilt after the 2013 tornado with newer roofs.
Most homes in Washington get their electricity from Ameren Illinois. That matters for solar, because your utility sets how you're credited for the power your panels send back to the grid and pays the state-required solar rebate.
For systems connected since 2025, Ameren credits exported power at the supply rate, so the best Washington systems are sized to cover what your home uses during the day. In exchange, Ameren pays about $300 per kW up front for systems with a smart inverter. See the full Ameren solar guide.
Wondering why your Ameren bill has climbed? See why Ameren bills are so high in 2026.
Is your Washington home a good fit?
- You own the home. Rooftop solar requires owning the roof.
- Your roof gets sun for most of the day on its south, west or east side, without heavy tree shade.
- Your roof has some life left. Replacing worn shingles before installing saves a removal fee later.
- Your Ameren bill is regularly over about $100 a month, or you're adding an EV or heat pump.
Not sure? A specialist can check satellite imagery of your Washington roof as part of your free quote.
What permits and paperwork does solar need in Washington?
- The City of Washington publishes separate permit applications for roof-mounted and ground-mounted solar, and a licensed electrician must do the installation.
- Washington was an early user of SolarAPP+, an automated permitting tool for standard rooftop systems, issuing its first permits through it by early 2024.
- The city has also signed on as a community solar subscriber, with credits expected from March 2025.
- 1
Building and electrical permits
Your installer applies to the City of Washington for the building and electrical permits, and a local inspector checks the finished work.
- 2
Illinois Shines application
Your installer registers the system with Illinois Shines, and you review and sign the program's disclosure form before installation.
- 3
Ameren interconnection and rebate
Ameren approves the connection, updates your meter and grants permission to operate; then your installer files for the $300/kW rebate.
- 4
Property tax form
File form PTAX-330 with the Tazewell County assessment office (the chief county assessment officer) so the system doesn't raise your assessment. See how Illinois taxes homes with solar.
In a neighborhood with a homeowners' or condo association? Illinois law stops associations from banning rooftop solar. See Illinois HOA solar rules. For timing, see how long solar installation takes.
Local sources: City of Washington: Building and zoning; City of Washington: SolarAPP+ update; City of Washington: Community solar subscriber agreement
How much could solar save your Washington home?
Get an instant solar estimate for your Washington home: enter your bill to see a system size, cost after incentives and payback.
Your estimate
- System size
- 7.6 kW
- about 19 panels
- Yearly production
- 9,424 kWh
- vs. about 9,529 kWh used
- First-year savings
- $1,272
- about $106/month
- Payback
- 9 years
- $43,400 saved over 25 years
| Estimated cost before incentives | $23,600 |
|---|---|
| Ameren solar rebate | −$2,280 |
| Illinois Shines REC valueUsually paid to your installer and passed on as a lower price. | −$9,900 |
| Estimated net cost | $11,400 |
Planning estimate only, not a quote. Assumes a south-facing roof, cash purchase and half of production used at home. Real numbers depend on your roof, equipment, rate plan and current program prices. How we estimate
Illinois incentives that still apply in 2026
$300/kW utility rebate
Ameren pay a one-time rebate of about $300 per kW for new systems with a smart inverter, around $2,100 on a 7 kW system.
Learn more →Illinois Shines
The state buys the renewable energy credits your panels create. Installers usually pass that value to you as a lower price.
Learn more →Net metering credits
Power you send back to the grid still earns bill credits. New systems are credited at the supply rate.
Learn more →$0-down options
With the federal homeowner credit gone, leases and PPAs can still pass along a business tax credit as a lower rate.
Learn more →
Program details last reviewed October 2026. Rules and amounts change, so confirm current terms with your installer.
How it works
- 1
Enter your ZIP
We confirm your home is in Illinois and which utility serves it.
- 2
Answer a few questions
Your typical electric bill, your roof and how you'd like to pay. It takes about two minutes.
- 3
Talk to a local specialist
An Illinois installer models your real savings, including Illinois Shines and your utility rebate. You decide what happens next.
Where else near Washington can you get solar quotes?
What should Washington homeowners know before going solar?
- How much do solar panels cost in Illinois?
What solar panels cost in Illinois in 2026 by system size, before and after the ComEd or Ameren rebate and Illinois Shines, and what drives the price.
- Why is my ComEd bill so high?
Why ComEd bills jumped in 2025 and 2026: capacity prices, supply and delivery increases, the end of the nuclear credit, and what you can do about it.
- Why is my Ameren Illinois bill so high?
Why Ameren Illinois bills jumped in 2025 and 2026: MISO capacity prices, summer supply rates, the 800 kWh winter tier, and ways to bring your bill down.
- Illinois solar incentives in 2026
Every Illinois solar incentive left in 2026: the ComEd and Ameren rebate, Illinois Shines, Solar for All, the property tax rule and what's left federally.
- How net metering works in Illinois now
How net metering works for new solar systems in ComEd and Ameren territory since 2025: supply-only credits, the $300/kW rebate, and how to size your system.
- Illinois Shines, explained
Illinois Shines pays for the renewable energy credits your solar panels create. Learn how the incentive works, who gets paid and how it lowers your price.
- The federal solar tax credit in 2026
The 30% federal residential solar credit ended after 2025. What that means for Illinois homeowners, and how leases and PPAs still capture federal value.
- Solar lease vs. buying in Illinois
Compare buying, financing, leasing and PPAs for solar in Illinois now that the federal homeowner credit is gone, and see who each option suits best.
- Is solar worth it in Illinois?
What solar panels cost in Illinois, what drives your savings with ComEd or Ameren, and how to tell if your home is a good fit in 2026.
- How much ComEd and Ameren pay for your excess solar
What ComEd and Ameren Illinois credit you in 2026 for solar power sent back to the grid, why it's below your retail rate, and how to get the most from it.
- Can an HOA ban solar panels in Illinois?
Illinois law stops HOAs and condo associations from banning rooftop solar. What your association can and can't require, and how to get approval.
- Do solar panels raise property taxes in Illinois?
Is there an Illinois solar property tax exemption? Solar homes are valued as if they had a conventional energy system, so panels shouldn't raise assessments.
- Illinois solar battery rebate and whether a battery is worth it
ComEd and Ameren pay a battery storage rebate of about $300 per kWh. Who qualifies, the new virtual power plant requirement, and when a battery pays off.
- How long does it take to go solar in Illinois?
From first quote to permission to operate: how long each step of a residential solar project takes with ComEd or Ameren, and what can slow it down.
- Community solar in Illinois: how it works and what it saves
Community solar lets ComEd and Ameren customers save without roof panels. How Illinois subscriptions work, typical savings, and what to check before signing.
- How to spot solar scams and pushy sales in Illinois
How to spot misleading solar sales pitches in Illinois, the protections Illinois Shines and federal law give you, and how to cancel or file a complaint.
- Should you replace your roof before going solar?
When to replace your roof before installing solar in Illinois, what removing and reinstalling panels later involves, and how to plan both projects together.
- Adding solar for an EV or heat pump in Illinois
How much extra solar an electric car or heat pump needs in Illinois, how ComEd and Ameren time-based rates fit in, and how to size for the added load.
- ComEd vs. Ameren Illinois: how solar compares
How going solar differs between ComEd and Ameren Illinois territory: rebates, export credits, Illinois Shines prices, sunshine, time-based rates and payback.
- Solar in Illinois winters: snow, hail and upkeep
How solar panels handle Illinois snow, cold and hail, how much they produce in winter, whether to clear snow, and the little maintenance they need.
- Solar loans in Illinois: cash, financing and dealer fees
How solar loans work in Illinois now the federal credit is gone, what dealer fees add to the price, and how to compare a low-rate loan with paying cash.
- Selling a house with solar panels in Illinois
Selling an Illinois home with solar: the value of owned systems, paying off or transferring a loan or lease, and clearing filings before closing.
- How many solar panels does an Illinois home need?
How many solar panels an Illinois home needs based on its electric bill, with sizing tables for ComEd and Ameren homes and the roof space each system takes.
- Does solar work during a power outage?
Why most Illinois solar systems shut off when the grid goes down, how batteries and backup-ready inverters keep power on, and how much backup you need.
- Solar warranties: what's covered and for how long
The four warranties behind an Illinois solar system, typical lengths for panels, inverters, batteries and workmanship, and what to check in a quote.
- How long do solar panels last?
How long solar panels last, how much output they lose each year, when inverters need replacing, and what that means for long-term savings on an Illinois home.
- Ground-mount vs. roof-mount solar in Illinois
When a ground-mounted array makes sense for an Illinois home, how it compares with rooftop solar on cost and output, and the zoning rules to check first.
- Solar with ComEd Hourly Pricing or Ameren Power Smart Pricing
How ComEd Hourly Pricing and Ameren Power Smart Pricing work for Illinois homes with solar, who saves, the price-spike risk, and the battery rebate tie-in.
- Is now a good time to go solar in Illinois?
What changed for Illinois solar in 2025 and 2026, from net metering and the federal credit to Illinois Shines and the new energy law, and whether to wait.
- Is solar worth it with a $250+ electric bill in Illinois?
What solar costs and saves for Illinois homes with $250 to $500 monthly electric bills, why big users save the most, and what to check before sizing up.
- How to choose a solar installer in Illinois
The certifications an Illinois solar installer must have, how to check one with Illinois Shines, what to compare between quotes, and red flags to avoid.
- Whole-home battery backup with solar in Illinois
Whole-home vs. essential-loads battery backup for Illinois homes: how many batteries you need, the ComEd and Ameren storage rebate, and where batteries can go.
- Are premium solar panels worth it in Illinois?
Premium vs. standard solar panels for Illinois homes: efficiency, warranties, degradation, inverter choices, and when paying more per watt pays off.
- Adding solar to a new build or remodel in Illinois
How to plan solar into a new Illinois home, addition or major remodel: solar-ready roofs, electrical panel sizing, energy codes, financing and timing.
- Is solar a good investment in Illinois?
The return on home solar in Illinois compared with Treasuries, stocks and paying down a mortgage, plus home value, taxes and the risks that lower it.
- Solar for large homes in Illinois
How big a solar system a large Illinois home needs, what changes above 10 kW and 25 kW, roof space, electrical service and how to get the best price.
- Adding a home EV charger with solar in Illinois
Adding a Level 2 EV charger with solar in Illinois: install costs, ComEd and Ameren rebates and rates, the expired federal credit and when to charge.
- What an Illinois solar quote should include, line by line
An Illinois solar quote line by line: system size, equipment, production, price per watt, incentives, financing, warranties and your right to cancel.
- Standby generator vs. battery backup in Illinois
Whole-home standby generator or solar battery for Illinois outages? Costs, fuel, noise, maintenance, rebates, outage history and when to combine them.
- Solar for a home with a pool or hot tub in Illinois
How much electricity a pool pump, pool heater or hot tub uses in Illinois, how much extra solar it needs, and the upgrades that cut the load first.
- Solar with a heat pump or electric heat in Illinois
How solar works for Illinois homes heated by a heat pump or electric heat: winter use, winter production, net metering credits and the annual period.
- Adding panels to an existing solar system in Illinois
Expanding an Illinois solar system: whether you keep pre-2025 net metering, the rebate trap, interconnection, Illinois Shines and mixing old and new panels.
- Refinancing a mortgage with solar panels in Illinois
How solar loans, leases and UCC filings affect refinancing an Illinois home, what Fannie Mae requires, and how owned and leased panels appraise.
- Solar panels and homeowners insurance in Illinois
Does homeowners insurance cover solar panels in Illinois? Dwelling limits, ground mounts, leased systems, hail risk and what to ask your insurer.
Washington solar FAQ
Who is the electric utility in Washington, IL?
Most homes in Washington are served by Ameren Illinois. Some addresses near town edges may be on a municipal utility or electric co-op, so check the name on your bill.
Are there solar rebates in Washington?
Yes. Ameren customers in Washington can get a one-time rebate of about $300 per kW for new solar systems with a smart inverter, around $2,100 for a 7 kW system, plus Illinois Shines incentives.
How much do solar panels cost in Washington?
For a home with a $150 monthly bill, we estimate a 7.6 kW system at about $23,600 before incentives, or about $11,400 after the Ameren rebate and Illinois Shines. Leases or PPAs can bring upfront cost to $0. Try the solar savings calculator, or get a free quote for real numbers on your Washington home.
How much electricity do solar panels produce in Washington?
About 1,240 kWh per year for each kW of panels on an unshaded, south-facing roof, so a 7.6 kW system would make roughly 9,424 kWh a year. Shade, roof direction and pitch can lower that.
Do I need a permit for solar in Washington?
Yes. Rooftop solar needs a building and electrical permit from your local building department (the city or Tazewell County), plus interconnection approval from Ameren. Your installer normally handles both.
How do I choose a solar company in Washington?
Get two or three quotes from installers that are Illinois Shines approved vendors, and compare the price per watt, equipment, warranties and how each handles the Ameren rebate and Illinois Shines. Our solar quote checker flags high prices and other red flags, and our guide to spotting solar scams covers pushy sales tactics.
Get a free solar quote for your Washington home
Free, no-obligation quote from a trusted Illinois solar partner.