Illinois Utility Cost Calculator
Illinois utilities: about $283 a month for a typical home (electric ~$133, gas ~$47, water ~$37, internet ~$66) at EIA's 19.22¢/kWh. Try your own numbers.
Typical total monthly utility bill in Illinois: $283 for a 1,800 sq ft home with 3 occupants -- $133 electricity, $47 natural gas, $37 water/sewer, and $66 internet under this page's default assumptions. Change the inputs below, or compare states with the utility bill estimator.
| Measure | Illinois | Rank, normal or source |
|---|---|---|
| Electricity price, July 2026 | 19.22¢ per kWh (July 2025 17.22¢, +11.6%) | 16th highest of 50; 5% above U.S. |
| Use per home, 2024 | 693 kWh a month | 36th highest of 50; 20% below U.S. |
| Electric bill | 693 kWh × 19.22¢ = $133.19, about $133 | 2024: $109.99 at 15.87¢, 44th highest of 50 |
| Natural gas, 2025 average | $11.25 per Mcf (about $1.08 per therm) | 33rd highest of 44 (2025 averages); July 2026 $21.04, not used |
| Heating degree days, Jul 2025–Jun 2026 | 5,707 | normal 6,354, 10% below |
| Cooling degree days, same months | 1,070 | normal 875, 22% above |
| Home energy, 2024 | natural gas 64.7%, electricity 27.5%, heating oil and propane 4.9%, wood 1.6% | EIA SEDS, at the meter |
| In-state generation, 2024 | nuclear 53.6%, natural gas 16.3%, coal 14.6% | EIA-923 |
| Largest residential sellers, 2024 | Commonwealth Edison Co (investor-owned) 45.6%; Ameren Illinois Company (investor-owned) 11.9% | EIA-861 |
EIA (EPM 5.6.A, EIA-861, gas annual prices at 10.37 therms per Mcf) read 2026-10-11; NOAA CPC, EIA SEDS and EIA-923 2026-10-13.
Estimate only — these are not official figures
EIA use and prices for Illinois; home-size scaling, gas use, water and internet modeled
Do not rely on these amounts for budgeting or payment. For exact amounts, check the residential rate of Commonwealth Edison Co or your own utility.
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Pre-filled: EIA Electric Power Monthly, Table 5.6.A (Residential, July 2026)
Pre-filled: EIA residential natural gas price, 2025 annual average ($11.25/Mcf)
Additional Details
Pre-filled: C2ER Cost of Living Index (via MERIC)
Monthly Electric Bill
Estimated • Based on your inputs
Total Monthly Utilities
$283.00
Annual Utility Costs
$3,396.00
Detailed Breakdown
Disclaimer: This calculator provides estimates for informational purposes only. Results should not be considered financial, tax, or legal advice. Consult a qualified professional for your specific situation.
How This Calculator Works
Calculation methodology and assumptions
Illinois inputs: 693 kWh a month (EIA-861 2024) × 19.22¢ (EIA, July 2026), scaled to your home size and occupants; gas $11.25/Mcf ÷ 10.37 = $1.0849/therm (EIA 2025 annual average); water $5.20 per 1,000 gallons and internet $66/month, both from cost-of-living index 94.5; income share on $83,211.
Key State Information
5,392,477 Illinois residential electricity customers (EIA-861, 2024) · cost-of-living index 94.5 · median household income $83,211.
What drives Illinois utility bills
Heating is Illinois's larger weather load: a normal July-to-June brings 6,354 heating against 875 cooling degree days. The 2025–26 heating season peaked in Jan 2026.
Natural gas supplied 64.7% of Illinois home energy in 2024, electricity 27.5%.
Commonwealth Edison Co sold 45.6% of Illinois's 2024 residential electricity, Ameren Illinois Company 11.9%.
| Month | Heating | Cooling |
|---|---|---|
| Jul 2025 | 0 | 385 |
| Aug 2025 | 31 | 245 |
| Sep 2025 | 57 | 135 |
| Oct 2025 | 282 | 43 |
| Nov 2025 | 710 | 0 |
| Dec 2025 | 1,180 | 0 |
| Jan 2026 | 1,350 | 0 |
| Feb 2026 | 922 | 0 |
| Mar 2026 | 629 | 0 |
| Apr 2026 | 317 | 18 |
| May 2026 | 192 | 65 |
| Jun 2026 | 37 | 179 |
StateCalc Team
Editorial Team
The StateCalc team builds free financial calculators using data from official government sources including the IRS, U.S. Census Bureau, BLS, and state revenue departments. All formulas are validated by an automated test suite and cross-referenced against published data.
Our editorial standardsFrequently Asked Questions
What is the average electric bill in Illinois?
EIA 2024: $109.99 a month (693 kWh × 15.87¢). July 2026 price 19.22¢: $133.
National Data
The full 50-state dataset behind this calculator
Compare Illinois With Other States
Side-by-side tax, housing & cost of living comparisons