Compare Natural Gas & Electricity Rates in Illinois

Enter your Illinois zip code, and a promo code if applicable, then click "get started." You'll see Constellation's available natural gas and electricity plans near you. Illinois residents can compare natural gas and electricity rates with no sign-up fees from Constellation.

Get Started

Enter your zip code now to see plans in your area.

Constellation offers these Illinois natural gas & electricity solutions:

Electricity Plans

Protect your budget with fixed-rate electricity plans. Choose the best electricity plan for your home based on our current Illinois alternative retail electric supplier rates and terms.

Compare Illinois Electricity Plans

Illinois renewable electricity plans from Constellation

Renewable Electric Plans

Support sustainable energy efforts while locking in a fixed-rate electricity plan. Enter your zip code to find Illinois electric plans that are sourced by 100% national wind power for your home.

Compare Illinois Renewable Plans

Natural Gas Plans

Lock in your fixed-rate energy plan based on current alternative Illinois natural gas supplier rates. Enter your zip code in IL to find which Constellation natural gas plans are available for your home and compare natural gas rates for Illinois.

Compare Illinois Natural Gas Plans

We Have the Power to Connect You with Home Security Solutions

Protect what you cherish most with 24/7-monitoring by Constellation Connect. Our smart home security system also connects to your home so you can control all your smart devices, like your thermostat or voice-controlled speakers. With $0 activation fees and no contracts, you can start protecting what matters most to you today.

Protect Your Home

The Benefits of Choosing Constellation

Compare natural gas rates, electricity plans, and energy solutions and choose the best option for your needs. As a leading Illinois energy supplier, all of our electricity, natural gas, and renewable energy plans include the following benefits:

1. Hassle-free switching with no service interruptions

You can compare natural gas prices and plans in Illinois and switch energy suppliers hassle-free and with no interruption to your service.

2. A quick and easy sign-up process

Our sign-up process is simple and straightforward, and can be completed in a matter of minutes.

3. Fixed-rate energy plans

Constellation is a trusted energy company with no hidden fees and a variety of electric, renewable and natural gas plans in Illinois to fit your life and budget.

4. Exceptional customer service

Our customer service team will help you with any questions you have when it comes to choosing a natural gas or electricity supplier with personal and timely responses.

Get Started Today

Enter your zip code below, and a promo code if applicable, to compare electric and natural gas rates in Illinois.

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When you join the Constellation family, you can:

Support Great Causes

Constellation customers can nominate local causes they care about to receive small grants (up to $500) through our Community Champions program. In Illinois, Constellation has donated over $15,750 to local groups!

Learn how to apply

Shop for Energy-Efficient Products with Constellation

Shop to Save Money & Energy

When you choose energy-efficient products, you can lower your energy consumption, conserve water, and you may even see financial savings. Find energy-efficient products in our store and get free shipping on all orders!

Shop for products in our store

Promoting Sustainability Through Sports in Illinois

As the preferred energy choice of the Chicago Blackhawks and Chicago Bulls, Constellation has been the official energy provider of the Chicago United Center since 2011. We believe in helping home-team fans save energy each season by hosting Go Green Games, and supporting Illinois energy users by donating Green-e Energy Certified Renewable Energy Certificates (RECs) each and every Go Green Game.

Constellation is proud to power the United Center and the Chicago Bulls and Chicago Blackhawks practice facilities.

Switching Illinois Energy Suppliers

In Illinois, utility companies used to be the only option for energy users — the utility controlled delivery, pricing and maintenance. Today, you can choose the best Illinois energy supplier for you meaning it's easy to compare electricity, natural gas, and renewable electric plans near you and select the best rate and plan for your needs.

What does energy choice mean?

Retail energy companies in Illinois compete for your business, which can result in reduced energy costs, better customer service, more innovative energy solutions, and energy plans to fit your budget. For example, Constellation offers:

no sign-up fees
exceptional customer service
a variety of fixed-rate electric and natural gas plans

Learn more about energy choice.

Understanding Energy Suppliers in Illinois vs. Utility Companies

Utilities companies deliver natural gas to your home. In Illinois, this means your utility — which many customers refer to as light and power companies — owns the power lines and gas pipelines which deliver energy to you to serve your home.

Constellation is an Illinois energy supplier, which means that we aren't the utility company that delivers natural gas to your home, but the one who sets your rate and contract term. As your energy supplier in Illinois, we provide you with customized electric plans, competitive Illinois natural gas rates, and exceptional customer service!

Learn more about the differences between energy suppliers and utility companies.

Power Outage & Natural Gas Emergency Information

Report a Power Outage

If you are experiencing a power outage, call your energy company in Illinois:

Ameren: 800-755-5000
ComEd: 800-334-7661

Sign Up for Outage Alerts

Report a Natural Gas Emergency

If you smell gas, get out of the area, and call your local Illinois utility company immediately.

Nicor Gas: 888-642-6748
North Shore Gas: 866-556-6005
People's Gas: 866-556-6002
Before you dig: 811

Illinois Net Metering

If you have any questions regarding participation in Illinois’ Net Metering program as a Constellation customer, please contact MMOPSMid-Continent@exeloncorp.com. Or, if you are ready to begin, please return the completed forms below:

Illinois Energy Resources

IL Environmental Disclosure - Constellation NewEnergy, Inc
IL Green Disclosure - Constellation NewEnergy, Inc.
Illinois Commerce Commission

How to Pay Your Energy Bill Online

To pay your energy bill online, select your local Illinois energy company below:

Ameren: Pay your bill
ComEd: Pay your bill
Nicor Gas: Pay your bill
North Shore Gas: Pay your bill
People's Gas: Pay your bill

Ready to switch Illinois energy suppliers?

Enter your zip code in IL below, and a promo code if applicable, to compare natural gas, electric rates and energy solutions in your area.

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⁺You may terminate this Contract without incurring an early termination fee during the 90 days following your enrollment date (the Guarantee Period) by notifying us in writing or by calling our customer care center at 1-855-465-1244. Upon your termination during the Guarantee Period, we will return you to being supplied by the Utility at your next available meter read date and you will remain responsible for payment for electricity and related costs and charges incurred under this Contract through such meter read date.