Is solar worth it in Illinois?
At Illinois’s average rate of 18.2¢/kWh and about 1250 kWh per kW of panels a year, a typical home pays back its system in roughly 11.8 years on electricity savings alone — no federal credit, which ended for buyers at the end of 2025 — then keeps saving. Run your own numbers below.
Sources: EIA · NREL · IRS. No federal credit — it ended 31 Dec 2025.
Independent estimate for guidance only — not a quote or advice. Illinois Shines SREC program plus net metering can meaningfully cut net cost.
What drives solar payback in Illinois
Illinois homeowners pay about 18.2¢/kWh, which is 0.2¢ below the national average. A rooftop here generates roughly 1250 kWh per kW each year — below the typical US figure. On exports, Illinois offers full retail net metering: Illinois Shines SREC program plus net metering can meaningfully cut net cost.
Illinois electricity price trend
Average residential rate, monthly, May 2023 – Apr 2026. Up 15% over the period.
Source: U.S. Energy Information Administration (EIA), Electric Power Monthly · range 13.74–20.47¢/kWh
A worked example
For an Illinois home with a $159/month power bill (typical household usage at Illinois’s rate):
That nets out to a payback of about 11.8 years — shorter than simply dividing net cost by year-one savings, because power prices climb ~2.5%/yr so your savings grow each year. Assumes 3.00 $/W installed before incentives and a typical 40% self-consumption; your actual cost, roof and usage will differ — adjust the calculator above.
Who supplies your power in Illinois
Illinois has two dominant investor-owned utilities: Commonwealth Edison (ComEd), covering Chicago and the northern third of the state, and Ameren Illinois, serving central and southern Illinois. MidAmerican Energy operates in a small pocket near the Iowa border. ComEd and Ameren both follow the statewide net-metering rules and administer the smart-inverter rebate, so terms are broadly consistent across the investor-owned territory. Municipal utilities — such as Springfield's City Water, Light & Power (CWLP) — and the state's rural electric co-operatives set their own terms and aren't bound by the state framework, so if you're served by a muni or a co-op, confirm net metering and rebates directly before you commit.
What you’re paid for what you export
The Climate and Equitable Jobs Act rewrote the export deal at the start of 2025: interconnect after 31 December 2024 in ComEd, Ameren or MidAmerican territory and you're on 'supply-only' net metering, where exports offset just the supply portion of your rate — the delivery charges and fixed fees keep coming. That cuts the value of an exported kilowatt-hour roughly in half, from a mid-teens full retail rate to something on the order of 7-8 cents. It could be worse: surplus credits still roll forward month to month, and there's nothing like California's punitive NEM 3.0-style time-of-use export penalties here. Anyone who interconnected on or before 31 December 2024 stays on the old full-retail arrangement for the life of the system. Municipal and co-op customers sit outside the state rule entirely, so ask yours what it pays before you size anything.
Illinois incentives & taxes in 2026
Illinois Shines — formally the Adjustable Block Program — is the state's strong suit. It buys the Solar Renewable Energy Credits your system will generate, usually paid to homeowners as a single upfront lump sum covering 15 years of production, which can knock a meaningful slice off the install price. The programme runs in annual programme years (the 2026-27 year opened on 1 June 2026) and remains active, though blocks can fill, so check current capacity. ComEd and Ameren add a one-time smart-inverter rebate per kW, a special property-tax assessment means the panels won't raise your property-tax bill, and lower-income households may qualify for Illinois Solar for All. With nothing coming from Washington any more, this state stack has to carry payback by itself.
The 30% federal credit ended on 31 December 2025 and can now only reach a homeowner indirectly through a lease or PPA. Check the current state and utility programs on DSIRE’s Illinois list, then type any incentive into the calculator above to see how it shortens your payback.
What solar costs in Illinois
Around $3.00 to $3.50 per watt is the going rate for a home install in Illinois, so an 8 kW system prices up in the mid-$20,000s before incentives. Winter output is modest and snow cover eats some production through the darker months. What keeps the numbers workable is that the Illinois Shines lump sum and the smart-inverter rebate claw back a substantial chunk of that sticker price.
The honest verdict for Illinois
Illinois still adds up, just less comfortably than it used to: the switch to supply-only crediting on 1 January 2025 roughly halved what new systems earn for exports, and it won't match New Jersey. The heavy lifting now comes from the incentive stack — the upfront Illinois Shines payment and the smart-inverter rebate — rather than the export credit, which sits at a supply-only 7-8 cents. Realistically an owned system pays back in something like 10 to 14 years. Your utility is the biggest variable: the state programmes reliably apply on ComEd and Ameren, so if a muni or a co-op serves you, confirm what's on offer before assuming the same maths holds.
Sources for this page
Driving electric — or heating electric — in Illinois?
Your home electricity rate also sets what it costs to charge an EV and whether a heat pump beats a gas furnace. See the Illinois EV charging cost and the Illinois heat pump vs gas comparison.