Is solar worth it in Illinois in 2026?

Through 2025, a 30% federal tax credit covered a large share of a home solar system's cost. That credit is gone for new post-2025 installations. In Illinois, that means the payback period is driven by your electricity rate, local production, install price, and your utility's export credit — not a federal subsidy. It does not automatically mean solar stops making sense here, but it raises the bar.

Illinois homeowners pay about 20.5¢/kWh for residential electricity (12-month average around 18.2¢/kWh). Higher-than-average rates mean every kilowatt-hour your panels offset is worth more, improving the case for solar.

A typical fixed rooftop system in Illinois produces roughly 1,250 kWh per kilowatt of panels each year — about 7,500 kWh annually for a common 6 kW system. That is a middle-of-the-road resource, typical for much of the country.

Moderate resource with cold winters and strong policy support. Modeled for a fixed roof mount near Chicago at a 38° tilt.

As a Midwest state, Illinois shares the Midwest's continental climate, where strong summer production offsets cloudier winters and prices sit near the national middle. Even so, solar economics are ultimately hyper-local: two neighbors with identical roofs can land on different answers depending on their utility, their specific rate plan, and how much power they use during daylight hours. Treat the state-level figures on this page as a starting point, then refine them with your own numbers.

To put real numbers on it: a representative Illinois home uses roughly 10,800 kWh a year, and offsetting about 90% of that would take a system near 7.8 kW. At the state's default $3,000 per kilowatt (3.00 per watt), that works out to roughly $23,328 before any state or utility incentives. Because there is no federal residential credit in 2026, that full amount is what you would finance or pay out of pocket — which is exactly why the local electricity rate and export credit now carry so much weight. Sizing the system closer to your own daytime usage, rather than maxing out the roof, can lower that upfront figure and, in Illinois, sometimes improves the return on each dollar spent.

Illinois's export policy is currently summarized as "Full retail net metering." Illinois offers net metering plus Illinois Shines SREC incentives. Full retail credit is the most favorable case — exported energy offsets your bill at the same rate you pay. Verify the exact export rate with your utility before deciding.

Adding a home battery changes the picture in Illinois. Without storage, a typical household consumes only about 45% of what its panels make and exports the rest; with a battery, self-use rises to roughly 70%. Because Illinois currently credits exports at close to full retail value, a battery here adds mostly backup power and resilience rather than a large jump in payback — the exported energy is already being credited fairly. Model both scenarios in the calculator by toggling the battery option to see how much it moves your specific numbers.

So who does solar actually suit in Illinois today? The strongest candidates own their home and roof, expect to stay at least 12 years, have a sunny and largely unshaded roof with room for panels, and pay for a meaningful amount of electricity each month. Illinois's above-average rates work in your favor here. If your bill is small, your roof is shaded or complicated, or you might move within a few years, the case is weaker now that the federal credit has ended. The only reliable way to know is to run your real bill and an actual installer quote through the calculator rather than trusting a national rule of thumb.

Whether you buy with cash, finance with a loan, or sign a lease or PPA changes who owns the system, who claims incentives, and who handles maintenance. In Illinois, run your specific quotes through the comparison tool before signing anything.

Our Illinois model uses Chicago as a representative location. Solar output is fairly uniform within a state, so the biggest differences come from your utility and roof — not your city. Use your own address's sun exposure and your utility's export rate for the most accurate result.