Electricity rates in Illinois: 18.79¢ per kWh
Homes in Illinois paid an average of 18.79¢ per kilowatt-hour from August 2025 to July 2026, 4% above the U.S. average of 17.99¢. That is the 16th-highest of 51, between Pennsylvania (20.70¢) and Wisconsin (18.74¢).
The average Illinois home used 700 kWh a month — the 17th-least of the 51 — so its typical bill came to $132 a month, the 12th-lowest. At the national rate the same 700 kWh would cost $6 less a month.
In July 2026, the latest month published, the Illinois rate was 19.22¢.
| Rank | State | Average rate | Latest month | Average home use | Average bill |
|---|---|---|---|---|---|
| 14 | Maryland | 21.03¢ | 21.41¢ | 945 kWh/mo | $199/mo |
| 15 | Pennsylvania | 20.70¢ | 21.72¢ | 840 kWh/mo | $174/mo |
| 16 | Illinois | 18.79¢ | 19.22¢ | 700 kWh/mo | $132/mo |
| 17 | Wisconsin | 18.74¢ | 19.06¢ | 664 kWh/mo | $124/mo |
| 18 | Ohio | 18.25¢ | 19.45¢ | 867 kWh/mo | $158/mo |
What a month of electricity costs in Illinois
At 18.79¢ per kWh, every extra 100 kWh a month adds $18.79 to the monthly bill and $225 to the year. The table runs from half to twice the Illinois average home's 700 kWh, using the same calculation as the calculator above.
| Monthly use | Per month | Per year | vs. U.S. rate (17.99¢) |
|---|---|---|---|
| 350 kWh (half the average) | $66 | $789 | +$3 |
| 700 kWh (state average) | $132 | $1,578 | +$6 |
| 1,050 kWh (1.5× the average) | $197 | $2,368 | +$8 |
| 1,400 kWh (twice the average) | $263 | $3,157 | +$11 |
Illinois electricity through the year
The average Illinois home's bill peaked at about $193 in July 2026 and was lowest, about $105, in November 2025. Use ran from 514 kWh in May 2026 to 1,005 kWh in July 2026, 2.0 times as much.
The rate moved too, from 16.36¢ in January 2026 to 23.85¢ in May 2026. A monthly rate includes that month's fuel and seasonal charges, which is why the calculator uses the 12-month average for a yearly estimate.
| Month | Rate | Use per home | Bill per home |
|---|---|---|---|
| Aug 2025 | 18.06¢ | 905 kWh | $163 |
| Sep 2025 | 19.05¢ | 657 kWh | $125 |
| Oct 2025 | 18.74¢ | 576 kWh | $108 |
| Nov 2025 | 18.31¢ | 576 kWh | $105 |
| Dec 2025 | 17.07¢ | 769 kWh | $131 |
| Jan 2026 | 16.36¢ | 812 kWh | $133 |
| Feb 2026 | 17.83¢ | 719 kWh | $128 |
| Mar 2026 | 18.86¢ | 611 kWh | $115 |
| Apr 2026 | 20.47¢ | 538 kWh | $110 |
| May 2026 | 23.85¢ | 514 kWh | $123 |
| Jun 2026 | 19.89¢ | 718 kWh | $143 |
| Jul 2026 | 19.22¢ | 1,005 kWh | $193 |
Largest electricity providers in Illinois
Among the 10 largest providers listed, average residential rates in 2024 ran from 9.99¢ at MidAmerican Energy Co to 19.79¢ at Jo-Carroll Energy, Inc. On the average Illinois home's 700 kWh that is a difference of $69 a month.
These are 2024 figures, the latest final year. The Illinois average was 15.87¢ that year and 18.79¢ over the last 12 months, up 18% — compare the providers with each other, not with today's average.
These providers serve 70% of Illinois's 5,392,477 residential customers. Many of the rest buy their power from a separate supplier while the local utility delivers it, so no single company's revenue covers their whole bill.
| Provider | Type | Homes served | Average rate | Use per home |
|---|---|---|---|---|
| Commonwealth Edison Co | Investor-owned | 2,922,223 | 15.22¢ | 583 kWh/mo |
| Ameren Illinois Company | Investor-owned | 520,498 | 15.26¢ | 853 kWh/mo |
| MidAmerican Energy Co | Investor-owned | 73,564 | 9.99¢ | 712 kWh/mo |
| City of Springfield | Municipal | 59,621 | 11.95¢ | 830 kWh/mo |
| City of Naperville | Municipal | 56,117 | 12.98¢ | 762 kWh/mo |
| Corn Belt Energy Corporation | Cooperative | 34,710 | 15.76¢ | 914 kWh/mo |
| Southwestern Electric Coop Inc | Cooperative | 24,822 | 13.68¢ | 1,124 kWh/mo |
| Southeastern IL Elec Coop, Inc | Cooperative | 22,731 | 14.47¢ | 1,146 kWh/mo |
| Norris Electric Coop | Cooperative | 18,074 | 15.08¢ | 1,128 kWh/mo |
| Jo-Carroll Energy, Inc | Cooperative | 17,227 | 19.79¢ | 708 kWh/mo |