Solar panels in Marion, IL

Marion is the Williamson County seat at the crossroads of I-57 and Illinois Route 13 in southern Illinois.

Most homes in Marion 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 Marion 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.

These estimates apply to homes with mailing addresses in Marion, including ZIP code 62959.

Wondering why your Ameren bill has climbed? See why Ameren bills are so high in 2026.

About 63% of homes in Marion are owner-occupied, and the median owner-occupied home is valued at $158,300, compared with 67% and $263,300 statewide, according to the U.S. Census Bureau (2020-2024 estimates).

• 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 Marion roof as part of your free quote.

Illinois Shines, the state's solar incentive program, had approved 314 home-sized solar systems (25 kW or smaller) in ZIP code 62959 as of September 2026, including 107 in the past 12 months.

About 62% of them are owned by the homeowner, paid in cash or with a loan, and the rest are leases or power purchase agreements, compared with 44% owned statewide. The typical system is 10.0 kW, larger than the 7.6 kW typical across Illinois. To compare the two ways to pay, see solar lease vs. buy in Illinois.

Marion ranks #24 of 174 Illinois towns we track for new approvals in the past 12 months, and #26 of 145 towns with at least 100 projects for the share of systems homeowners own. See how Illinois towns compare.

Check these before you sign with any solar company serving Marion:

• Illinois Commerce Commission certification. Installers need the state's distributed generation installer certification for your system to be net metered.
• Illinois Shines Approved Vendor or Designee. Only registered companies can pass along the Illinois Shines incentive. Look them up on illinoisshines.com and make sure they aren't suspended.
• Local registration. Many Illinois towns require contractors to be licensed or registered locally, so ask whether the company is set up to pull permits with the City of Marion.
• Two or three quotes compared on price per watt, equipment, warranties and how each handles the Ameren rebate. Our solar quote checker flags high prices, and what a quote should include walks through each line.
• No pressure. Walk away from same-day signing deadlines, "free solar" pitches and quotes that still subtract the expired federal tax credit. See spotting solar scams.

For more, see how to choose a solar installer in Illinois, or request a free quote for your Marion home from one of our trusted Illinois partners.

Yes. A battery stores your solar power and keeps chosen circuits running when the Ameren grid goes down, which standard solar alone can't do. Ameren pays about $300 per kWh of battery capacity, around $4,050 for one 13.5 kWh battery, if you enroll it in the utility's virtual power plant program.

• Essentials: one battery usually covers the refrigerator, lights, internet, sump pump and furnace fan.
• Whole home: running central air, an electric range or a well pump usually takes two or more batteries.
• Adding later: many batteries can be added to an existing solar system, so ask installers about it even if you start with panels only.
• On a private well: an outage also stops your well pump, so make sure the battery can start it. See battery backup for homes on well water.

See what a home battery costs in Illinois, how the virtual power plant works and Powerwall 3 vs. Enphase vs. FranklinWH.

• Marion says its role in home solar is to review the building permit and check that the installation meets the required building codes.
• Marion's old electric aggregation rate of $0.054 per kWh ended in December 2023, and the renewal with Homefield Energy was a 55.5% increase. If you have net-metered solar, check how a supplier switch affects your credits. See Price to Compare.

1. 1

   Building and electrical permits

   Your installer applies to the City of Marion for the building and electrical permits, and a local inspector checks the finished work.

2. 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. 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. 4

   Property tax form

   File form PTAX-330 with the Williamson 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.