Current Average Electricity Supply Rate in Illinois
As of September 2025, the average residential electricity price in Illinois is around 19.05¢ per kilowatt‑hour. This puts Illinois slightly above the U.S. average but lower than most New England states. Consumers here benefit from a competitive retail market and municipal aggregation programs that often secure lower rates than default utility supply.
Recent Rate Trends
June 2025: 18.5¢/kWh
July 2025: 18.7¢/kWh
August 2025: 18.9¢/kWh
Projected Rate Trends
November 2025: 19.4¢/kWh
October 2025: 19.2¢/kWh
November 2025: 19
Where Illinois rates are today
Illinois residential electricity prices hover around 19.05¢ per kilowatt-hour. This places Illinois slightly above the U.S. average but below many northeastern states. Consumers benefit from a competitive retail market and municipal aggregation programs that often secure lower rates than default utility supply.
Why Illinois rates are the way they are
Illinois participates in both the Midcontinent ISO and PJM power markets, which provide diverse generation sources including nuclear, natural gas, and renewables. Municipal aggregation programs allow towns to purchase power on behalf of residents, often at lower rates. However, transmission constraints and capacity charges can influence costs, and recent policy shifts and generation retirements have nudged rates higher.
Where Illinois rates are going in the next 3 months
Looking ahead to winter, average supply costs are expected to edge up 1–3%. Wholesale prices have been trending higher due to increased demand and ongoing capacity investments, so consumers may see modest rate increases through December. Shopping for a fixed-rate plan could help hedge against winter volatility.
Key Indicators Affecting Illinois Commercial Electric Supply Rates
Illinois electricity rates are driven by a mix of supply, demand and policy factors. One of the biggest trends is the surge in demand from data centers and artificial‑intelligence facilities around Chicago. According to the Citizens Utility Board, new AI data centers have caused energy demand and electricity bills to “go through the roof” because everyday consumers are paying for the power these centers use【413508610438100†L154-L160】. Higher demand puts upward pressure on wholesale prices.
Another indicator is Illinois’ evolving generation mix and policy landscape. Lawmakers recently passed an energy reform bill that lifts a long‑standing ban on new nuclear plants, funds energy storage projects and gives state regulators more authority over supply, with the goal of lowering costs in the long term【413508610438100†L173-L184】. If new nuclear and storage projects come online, they could increase supply and stabilize rates. But in the interim, ratepayers are also funding the transition through charges on their bills.
Finally, capacity and transmission charges set by PJM and MISO, along with natural‑gas price volatility, can cause monthly swings. When gas prices spike or when transmission lines are congested, wholesale supply costs rise and are passed on to customers. Conversely, mild weather and low gas prices can ease rates. Keeping an eye on these indicators can help Illinois businesses anticipate whether supply offers will move up or down over the coming months.
Key takeaway for businesses
Illinois businesses should monitor energy markets and take advantage of competitive offers from alternative suppliers. Locking in a multi-month rate now may protect against price bumps as winter heating demand grows.