Data page · Midwest region
Solar Panel Cost in Illinois (2026)
A typical Illinois rooftop system costs around $2.95/W cash, installed, before incentives — with most quotes landing between $2.7/W and $3.2/W. The federal residential tax credit is $0 for 2026 installations (it ended 12/31/2025).
Market estimate · compiled 2026-08 · sources: marketplace reports, NREL, EIA, state programs — see methodology.
The federal residential solar tax credit (30% §25D) ended December 31, 2025.
Under the One Big Beautiful Bill Act, systems placed in service on or after January 1, 2026 do not qualify for the residential credit. Systems installed and operational by December 31, 2025 can still be claimed at 30% on the 2025 return. Commercial and third-party-owned (lease/PPA) projects may qualify under §48E — see the federal incentives page.
Status verified 2026-08-21. Confirm your circumstances with a qualified tax professional.
Typical cash price / watt
$2.95
range $2.70–$3.20 $/W
10 kW system (gross)
$29,500
$27,000–$32,000 · before incentives
Avg electricity rate
23.85¢/kWh
EIA May 2026 · avg use 693 kWh/mo
Export / net-metering
varies
Most utilities offer retail net metering, but terms vary by utility and delivery territory…
Cost by system size
Gross installed cash price, before incentives. Net cost in 2026 = gross − $0 federal − any verified state/local incentive (see below).
Solar resource & economics
- Production factor (est.)
- 1520 kWh/kW/yr
- 10 kW annual production (est.)
- 13,072 kWh
- Year-1 savings for 10 kW at avg rate, 35% self-use
- $2,611
- Simple payback (net cost ÷ Yr-1 savings, rough)
- ≈ 19 yrs
These are rough planning numbers. Model your exact scenario in the price calculator — assumptions are visible and adjustable.
Export policy detail
Most utilities offer retail net metering, but terms vary by utility and delivery territory.
Why it matters: if exports are credited at the retail rate (1:1 net metering), every kWh counts the same. Under net billing or avoided-cost export, storing daytime power (battery) or shifting use matters far more. Your utility’s tariff — not the state average — decides this. Utility records
Incentives in Illinois (status-aware)
Illinois Shines (Adjustable Block Program)
CurrentREC-based incentive (declining block values)
Confirm current block value and vendor arrangements.
Source: Illinois Power Agency · Last checked 2026-08-21
Property tax assessment exemption
CurrentSolar excluded from assessed value
Confirmed current.
Source: Illinois Compiled Statutes · Last checked 2026-08-21
Tax exemptions: Property tax — current: Solar excluded from assessed value.
Federal residential credit (§25D): expired 12/31/2025 — $0 for 2026 installations. Commercial/third-party-owned projects: see federal incentives.
Local considerations
- Illinois Shines (REC-based) can materially improve economics — block values decline.
- High rates in some territories (ComEd) improve payback.
- Winter sun is weak; production is summer-weighted.
Battery note: batteries add roughly $1,000–$2,000/kWh installed and rarely pay for themselves on energy savings alone. In Illinois, storage value depends on your export policy (varies), TOU rates and outage risk — model it in the battery calculator.
Nearby states
Next steps
Every estimate on this page is a planning range — only a site inspection and real quote give an exact price.
Data sources: EIA Electric Power Monthly (rates, May 2026) · NREL (solar resource) · marketplace cost reports & state programs (cost estimates, 2026) · incentive records last checked 2026-08-21. Full detail in methodology.