Compare The Best Illinois Electricity and Natural Gas Providers and Rates

Author:
Tim Wasson
Editor:
Matt Oberle
Last Updated:
02-05-2026
Enter your zip code and select a service type to compare energy rates and order in minutes
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About Constellation

Constellation prices were consistent, easy access to account info. We had no problems to contact them.

- Gustafson from Cherry Valley

Electricity Plan
  • 12 months
  • Plan MRC $0
$ 11.790
effective rate per kWh

12 Month Green Home Power Plan

Call 866-630-0685
Natural Gas Plan
  • 12 months
  • Plan MRC $0
$ 0.599
effective rate per Therm

|12 Month Natural Gas Plan|12 Month Home Natural Gas Plan|

Call 866-630-0685
Rates as of Jun 10, 2026 at 07:30 AM

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Illinois Electricity and Natural Gas Choice

In Illinois you can choose the company you buy electricity or buy natural gas from.

You can select from the best rates, plans, and terms that best fit you.

Power to choose

Illinois' Best Energy Providers

We've rated the energy companies in Illinois based on multiple criteria, including BBB and regulatory complaints, plan types and availability, ease-of-use, and much, much more.

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Recommended Illinois Natural Gas Plans

Select Your Utility

    • I normally use:
      1,000
      kWh per month
    View More Electricity Plans

    Recommended Illinois Natural Gas Plans

      • I normally use:
        1,000
        kWh per month
      6 Month Fixed Rate

      Recommended

      $ 0.599 effective rate per therm

      6 Month Home Natural Gas Plan

      • 6
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      • Plan MRCMRC
      • $ 0
      6 Month Home Natural Gas Plan Details
      • Early Termination Fee: $50
      • fixed-rate
      • 6 Months
      12 Month Fixed Rate

      Recommended

      $ 0.512 effective rate per therm

      Fixed-Rate Gas 12

      • 12
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      • Plan MRCMRC
      • $ 0
      Fixed-Rate Gas 12 Details
      • fixed-rate
      • 12 Months
      12 Month Fixed Rate

      Recommended

      $ 0.509 effective rate per therm

      Guard 12

      • 12
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      • Plan MRCMRC
      • $ 4.95
      Guard 12 Details
      • Monthly Recurring Charge: $4.95
      • fixed-rate
      • 12 Months
      12 Month Fixed Rate

      Recommended

      $ 0.599 effective rate per therm

      SureLock 12

      Check Availability
      • 12
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      • Plan MRCMRC
      • $ 0
      SureLock 12 Details
      • Early Termination Fee: $0.00
      • fixed-rate
      • 12 Months
      Check Availability
      View More Natural Gas Plans

      Featured Plan

        • I normally use:
          1,000
          kWh per month
        Plan Details

        12 Month Green Home Power Plan

        11.8 ¢ /kwh
        12 Months Locked Rate
        • 0% Green Energy
        $0.00 MRC per month
        Fixed Rate Plan Type
        $50 Termination Fee
        • Early Termination Fee: $50
        • fixed-rate
        • 12 Months

        Illinois Energy News & Resources