A worked example: 8 kW in Illinois
An 8 kW system — about 19 × 425-watt panels — at Illinois's assumed installed cost of $2.60–$3.40 per watt runs roughly $20,800–$27,200 before incentives. At about 1,270 kWh of production per installed kW, it would generate around 10,160 kWh per year. Valuing self-consumed electricity at the assumed $0.16/kWh retail rate and exports conservatively, first-year savings land near $1,339 — a simple payback of roughly 16–20 years.
There is no federal tax credit in that math: the Section 25D residential credit ended for systems installed after December 31, 2025. State or utility incentives, where they exist, would shorten payback from here.
Net metering in Illinois
Illinois ended full retail net metering for new customers in 2025; exports are now credited at the supply portion of the rate, with a distributed-generation rebate available in ComEd and Ameren territory to offset the change.
Illinois solar incentives
Illinois Shines (Adjustable Block Program) pays substantial upfront incentives for solar renewable energy credits, often worth thousands of dollars on a residential system. Verify current block pricing.
What changes a Illinois solar quote?
Equipment, roof condition, electrical upgrades, permitting, labor, system size, batteries and financing can all change the installed price. Savings also depend on the specific utility rate, how much solar electricity the home uses directly, and what the utility pays for exports.
Frequently asked questions
How much do solar panels cost in Illinois?
Using an assumed installed cost of $2.60–$3.40 per watt, a typical 8 kW home system in Illinois costs roughly $20,800–$27,200 before incentives. Smaller and larger systems scale roughly with size, though small systems cost more per watt.
Is solar worth it in Illinois?
With Illinois electricity around $0.16/kWh and production around 1,270 kWh per installed kW per year, an 8 kW system could save roughly $1,339 in year one, for a simple payback of about 16–20 years with no federal credit. Whether that is "worth it" depends on your rate plan, export compensation, roof, and how long you plan to stay in the home.
Does Illinois have net metering?
Illinois ended full retail net metering for new customers in 2025; exports are now credited at the supply portion of the rate, with a distributed-generation rebate available in ComEd and Ameren territory to offset the change.
What solar incentives does Illinois offer in 2026?
Illinois Shines (Adjustable Block Program) pays substantial upfront incentives for solar renewable energy credits, often worth thousands of dollars on a residential system. Verify current block pricing. Note that the federal Section 25D residential credit ended for systems installed after December 31, 2025, so state, local and utility programs are now the main incentives for purchased systems.
Is there still a federal solar tax credit in Illinois?
No — the 30% federal residential clean energy credit (Section 25D) ended for systems installed after December 31, 2025 under the One Big Beautiful Bill Act. Leased or PPA systems may still benefit indirectly because the system owner can claim the commercial 48E credit through 2027.
Use this as a starting point
This page provides broad state assumptions, not a current market survey or binding quote. Before purchasing, verify applicable incentives, utility rules, installer licensing, warranties and financing terms.
Where these numbers come from
State assumptions are informed by public data and reviewed periodically (September 2026):