Compare The Best Illinois Electricity and Natural Gas Providers and Rates

Author:
Tim Wasson
Editor:
Matt Oberle
Last Updated:
02-05-2026
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Featured Provider

Constellation gold award
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 $0.00
12.19¢
effective rate per kWh

12 Month Green Home Power Plan

Utility: ComEd
Call 866-630-0685
Natural Gas Plan
  • 12 months
  • Plan MRC $0.00
$0.559
effective rate per therm

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

Utility: Nicor
Call 866-630-0685
Rates as of Oct 31, 2026 at 04:22 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
      Rates as of Oct 31, 2026 at 04:22 AM
      12 Month Fixed Rate

      Recommended

      $ 0.408 effective rate per therm

      Fixed-Rate Gas 12

      • 12
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      $0 Monthly Charge
      Fixed-Rate Gas 12 Details
      $0 Monthly Charge
      Fixed Rate
      Fixed Rate

      Plan Type

      Fixed Rate
      12 Months

      Locked Rate

      (Note: The Early Termination Fee will not be charged if you end your contract early because you are moving out.)
      Provider

      Utility:

      Nicor

      Nicor logo
      12 Month Fixed Rate

      Recommended

      $ 0.459 effective rate per therm

      Guard 12

      • 12
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      • Plan MRCMRC
      • $ 4.95 MRC (Monthly Recurring Charge) is a fixed monthly fee charged by the energy provider, separate from the cost of the energy you use.
      Guard 12 Details
      Fixed Rate
      Fixed Rate

      Plan Type

      Fixed Rate
      12 Months

      Locked Rate

      Fixed Rate
      $4.95

      Monthly Recurring Charge

      Provider

      Founded in 1999 and licensed to sell electricity in Texas in 2002, Spark Energy is now a national retail electricity and natural gas provider. They no..

      Utility:

      Nicor

      Nicor logo
      6 Month Fixed Rate

      Recommended

      $ 0.579 effective rate per therm

      6 Month Home Natural Gas Plan

      • 6
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      $0 Monthly Charge
      6 Month Home Natural Gas Plan Details
      $0 Monthly Charge
      Fixed Rate
      Fixed Rate

      Plan Type

      Fixed Rate
      6 Months

      Locked Rate

      Fixed Rate
      $50

      Early Termination Fee

      Provider

      Constellation is the US's largest producer of carbon-free energy and a leader of retail supply of power, natural gas and home services for residences ..

      Utility:

      Nicor

      Nicor logo
      12 Month Fixed Rate

      Recommended

      $ 0.549 effective rate per therm

      SureLock 12

      Check Availability
      • 12
      • monthsmo.
      • Fixed Rate
      • 0% Green Energy
      $0 Monthly Charge
      SureLock 12 Details
      $0 Monthly Charge
      Fixed Rate
      Fixed Rate

      Plan Type

      Fixed Rate
      12 Months

      Locked Rate

      Fixed Rate
      $0.00

      Early Termination Fee

      Check Availability
      Provider

      XOOM Energy is a retail energy provider that offers electricity and natural gas service in select states. Service areas include California, Ohio, Conn..

      Utility:

      Nicor

      Nicor logo
      View More Natural Gas Plans

      Featured Plan

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

        12 Month Green Home Power Plan

        12.19 ¢ /kwh
        12 Months Locked Rate
        • 0% Green Energy
        $0.00 MRC MRC (Monthly Recurring Charge) is a fixed monthly fee charged by the energy provider, separate from the cost of the energy you use. per month
        Fixed Rate Plan Type
        $50 Termination Fee
        Fixed Rate
        Fixed Rate

        Plan Type

        Fixed Rate
        12 Months

        Locked Rate

        Fixed Rate
        $50

        Early Termination Fee

        (Note: The Early Termination Fee will not be charged if you end your contract early because you are moving out.)

        Constellation is the US's largest producer of carbon-free energy and a leader of retail supply of power, natural gas and home services for residences ..

        Utility:

        ComEd

        ComEd logo

        Illinois Energy News & Resources