Is solar worth it in Illinois?
Short answer: on illustrative average numbers, a typical 8 kW system bought with cash pays back in about 12 years in Illinois — then keeps saving for the rest of the panels' ~25-year life. But it hinges on your rates, usage, and net-metering terms, so run your own numbers below.
What drives solar economics in Illinois
Two things move the needle most: how much you pay for grid power, and how much sun your panels get. Illinois's residential electricity runs around 16¢/kWh, close to the US average. And with moderate sun (about 1,200 kWh per kW installed each year), an 8 kW system produces roughly 9,600 kWh/year.
The third factor is net metering. Illinois generally credits exported solar at or near the retail rate (traditional net metering), which makes midday surplus more valuable. Net-metering rules change, so confirm your specific utility's current terms.
Remember solar offsets the generation part of your bill, not delivery and fixed fees — so even a great system in Illinois won't take your bill to zero.
A typical system, run honestly
For an 8 kW system at about $3/W (≈$24,000), minus the 30% federal tax credit (≈$7,200), the net cost is roughly $16,800. On Illinois's averages that returns about $25,092 net over 25 years, with first-year savings near $1,229. These are illustrative — your quote, roof, and utility will differ.
Run your Illinois numbers
This opens the calculator pre-filled with Illinois averages — then adjust to match your quote and bill.
Run the Numbers →FAQ
Is solar worth it in Illinois?
For a typical 8 kW cash system (~$16,800 after the federal credit), payback is about 12 years on illustrative averages, then it keeps saving for ~25 years. Confirm with your own rates and net-metering terms.
What's the average payback period in Illinois?
About 12 years for a cash purchase at ~16¢/kWh and 1,200 kWh/kW of sun. A loan lengthens it because of interest.
Does Illinois have net metering?
Net metering (≈ retail credit). Illinois generally credits exported solar at or near the retail rate (traditional net metering), which makes midday surplus more valuable. Net-metering rules change, so confirm your specific utility's current terms.
Figures are approximate Illinois averages (~2026) for illustration, drawn from public EIA rate data and NREL production ranges. Net-metering policy changes often. Verify everything against your own bill and current utility tariffs. Not financial advice.