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Constellation Energy

Constellation Energy is a large alternative electricity and natural gas supplier, serving residential and commercial customers in much of the United States.

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States Served by Constellation


Constellation provides residential electricity service to Connecticut, Illinois, Maryland, Massachusetts, New Jersey, New York, Ohio, Pennsylvania, Texas, and Washington, D.C.


Natural Gas

States served for residential natural gas supply include Illinois, Indiana, Georgia, Kentucky, Maryland, Michigan, Nebraska, New Jersey, New York, Ohio, Pennsylvania, Virginia, and Washington, D.C.


Natural Gas & Electricity Rate Plans Available

There are variable and fixed rate options for both natural gas and electricity rate plans. There are often early cancellation fees.

Rate Type Duration Details Cancellation Fee
Fixed Rate, Fixed Price Plan 12, 24 or 36 months
  • Rates do not change during contract period
  • 90 trial period possible
  • 12 month contract: $100 if cancelled after trial period
  • 24 or 36 month contracts: $200 if cancelled after trial
Fixed Rate, Multi Step Rate Plan 12, 24 or 36 months
  • Rates may change during contract period, according to schedule in contract
  • 90 trial period possible
$50 if cancelled after 90 day period
Green Energy plans 12 or 24 months
  • Fixed rates available
  • 90 trial period possible
  • 100% renewable energy
$150 if cancelled after 90 day period
Variable Rate No contract
  • Price changes on monthly basis according to market
  • Plan automatically renews each month
No cancellation fee

After switching to Constellation you will still only receive one bill from your local utility.

Compare Constellation's contract details, prices, customer reviews and more with 4 other major American retail energy providers.

Budget Billing

There are budget billing options for customers on fixed rate contracts with Constellation. Based on your energy consumption the year before, Constellation estimates your usage for the year to come, and divides it up over an entire 12 month period. Every three months, Constellation tracks your consumption to be sure you are paying an appropriate amount, and will make adjustments where necessary. Budget billing plans are favored by some customers because they even out prices throughout the year.

Renewable Wind Energy

Constellation's green energy customers are supplied with renewable wind energy. This energy source is green because it does not have negative environmental impacts in electricity generation. In contrast, traditional non-renewable sources like natural gas are often used to generate electricity, releasing pollutants and burning a limited resource at the same time.

Green energy plans are only available with Constellation in Pennsylvania and Maryland at this time.


Customers can earn rewards for paying their bills on time, and for the amount of energy consumed. Rewards include gift cards, bill credits, and cashback.

Customer Reviews of Constellation

Some consumers have been impressed with their savings after joining Constellation. Additionally, there are 100% green energy, fixed-rate options so that consumers can save and make environmentally-conscious decisions at the same time. Other consumers appreciate the company's reward offers.

However, there is some concern about deceptive business practices and hidden contractual obligations. Some consumers have stated that Constellation automatically enrolls them in a variable rate plan at the end of a contract period, without notification, and rates skyrocket afterwards. Others feel that Constellation's customer service contacts customers too frequently.

Read more reviews, including our opinion, on our Constellation customer review page.

Business and Commercial Customers

Constellation is highly successful with business customers, serving two-thirds of Fortune 100 companies.

Commercial customers can get both electrical and gas service from Constellation in California, Connecticut, Illinois, Maine, Maryland, Massachusetts, Michigan, New Jersey, New York, Ohio, Oregon, Pennsylvania, Rhode Island, Texas, and Washington, D.C.

New Hampshire and Delaware have just electrical commerical service. Natural gas only territories include Arkansas, Colorado, Florida, Georgia, Iowa, Kansas, Kentucky, Oklahoma, Missouri, Minnesota, Nebraska, North Carolina, South Carolina, South Dakota, Tennessee, Virginia, and Wyoming.

Business customers also have the opportunity to sign up for on-site solar power service.


Formerly known as Constellation Energy Group, the company was eventually purchased by Exelon, and its full name was changed to Constellation, an Exelon Company to reflect this change in ownership. Constellation has always been headquarted in Baltimore, Maryland.

In late 2014, Constellation acquired Integrys Energy, a large supplier serving 1.2 million consumers in 22 states. Other subsidiaries include StarTex Power, which serves Texas customers, and MXEnergy in Georgia. Constellation's combined customer base will equal 2.5 million after the merger.

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