Electricity rates — Illinois

What a typical bill in Illinois costs

At 1,000 kWh a month the 3 generally available plans here run from $1,750.64 on BES - Residential Single Family Without Electric Space Heat Delivery Class to $5,616.04 on DS-1 Residential Zone 3, with a median of $2,743.60.

Effective rates span 14.6¢ to 46.8¢ per kWh at that usage.

What households in Illinois pay, by EIA's count

Illinois's residential electricity averaged 18.5¢ per kWh over the 12 months to June 2026, the 17th-highest of the 50 states and DC and 3% above the US average of 17.9¢. It sits between Ohio (18.0¢) and Wisconsin (18.6¢).

EIA lists 25 utilities serving homes in Illinois. By homes served, the largest 5 are Commonwealth Edison Co (3,727,675), Ameren Illinois Company (1,060,894), MidAmerican Energy Co (73,582), City of Springfield - (IL) (59,621), and City of Naperville - (IL) (56,117). Investor-owned utilities supply about 66% of its households on full service.

Prices in Illinois jumped 11.5% in a year, from 16.6¢ to 18.5¢ per kWh.

Illinois homes used the most electricity in July and the least in April (2021–2025): a summer peak, 1.9 times the lightest month. July's bills were the highest, averaging $149; April's the lowest, $85. November was the dearest month per kWh, 15% above January.

The utilities with a ranked plan on this page serve about 89% of Illinois's households: Commonwealth Edison Co (3,727,675), Ameren Illinois Company (1,060,894). Their median plan at 1,000 kWh a month works out to 22.9¢ per kWh, 23% above EIA's average, which is why this page compares that median with other states'.

Chart of this for reuse (PNG), free to republish under CC BY 4.0 with credit to WattClear. Suggested alt text: “Bar chart. Illinois's average home electricity price, July 2025 to June 2026, was 11.5% higher than the 12 months before, the joint 7th-largest rise of the 50 states. Washington, DC: +24.9%. United States average: +6.7%. Source: U.S. Energy Information Administration.”

In the guides: Summer and winter bills, state by state

How Illinois compares

At 1,000 kWh a month the median plan in Illinois costs $2,743.60 a year: the 14th-highest of the 30 states whose indexed plans stand for them, and 19% more than their median of $2,303.60. It sits between Washington, DC ($2,332.96) and Pennsylvania ($2,772.87).

Its cheapest open plan, BES - Residential Single Family Without Electric Space Heat Delivery Class from Commonwealth Edison Co at $1,750.64, is the 11th-lowest of the 30 states' cheapest plans.

1 of its 33 priceable plans prices by the hour, the 3rd-smallest share of any state here.

In the guides: What published electricity plans cost, state by state · What a plan charges by the hour, and what moving a kilowatt-hour is worth

What each provider in Illinois costs

2 utilities serve customers across Illinois in this data. At 1,000 kWh a month the cheapest of them is Commonwealth Edison Co at $1,750.64 a year on BES - Residential Single Family Without Electric Space Heat Delivery Class; the dearest is Ameren Illinois Company at $2,743.60.

That is $992.96 a year between the best each provider offers.

Cheapest available plan by provider: Commonwealth Edison Co $1,750.64; Ameren Illinois Company $2,743.60.

Which plan in Illinois is cheapest as use rises

BES - Residential Single Family Without Electric Space Heat Delivery Class is cheapest at every level tested — $992.46 a year at 500 kWh a month, $3,267.04 at 2,000 kWh.

The penalty for a poor choice grows with usage: $1,924.10 a year at 500 kWh against $7,600.84 at 2,000 kWh.

How Illinois's plans are structured

Of 33 priceable plans: 6 tiered, 1 time-of-use, 19 priced by season, 4 with demand charges, 9 flat-rate.

Fixed monthly charges run from $7.41 to $21.66.

Who provides Illinois's plans

These plans come from 4 utilities: Ameren Illinois Company, City of Springfield, Illinois (Utility Company), Commonwealth Edison Co, MidAmerican Energy Co (Illinois).

The largest saving among Illinois's plans

Moving from DS-1 Residential Zone 3 to BES - Residential Single Family Without Electric Space Heat Delivery Class saves $3,865.40 a year at 1,000 kWh a month, with no change in consumption.

What the Illinois figures do not cover

One of these plans prices by the hour; its figure assumes the typical hourly pattern of homes in Illinois, not this household's own hours.