Constellation Reviews

formerly MXEnergy

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About Constellation

This profile has not been claimed by the company. See reviews below to learn more or submit your own review.

Constellation provides energy solutions, specializing in electricity and natural gas. The company offers supply and management services for residential, commercial and industrial clients. Constellation also incorporates renewable energy sources and innovative energy efficiency programs.

Pros
  • Significant cost savings reported
  • Reliable service during outages
Cons
  • Frequent billing discrepancies
  • Poor customer service in some cases

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Constellation Reviews

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    How do I know I can trust these reviews about MXEnergy?
    • 4,889,664 reviews on ConsumerAffairs are verified.
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    • Our moderators read all reviews to verify quality and helpfulness.
    Page 1 Reviews 0 - 10
    Customer ServiceCoverageTechPunctuality & SpeedMaintenanceStaffBillingTimelinessFollow-ThroughHonesty & Transparency

    Reviewed May 19, 2026

    One star is too generous. I have been a Constellation customer for six years. Every single bill, I paid the same day I received it. Not on the due date, not late, the same day. The one time I actually needed this company to do something for me, they jerked me around and lied to me. A technician came out to my house and could not get the job done. Then he called me in the morning to tell me my issue was not covered. I asked him to put me through to a supervisor. The supervisor never called back.

    A man named Nick eventually left me a vague message and never actually followed through. When the technician finally reached me again, he was not calling to help, he was calling to argue with me about why nothing was going to be fixed. No accountability. No follow through. No respect for a long term, on time, loyal customer. Six years of paying you people on time and this is what I get the one time I need you. I am done. I will be exploring my legal options. Do yourself a favor and choose a different company.

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    PriceBilling

    Reviewed April 10, 2026

    Constellation is a full rip off. I noticed a monthly gas bill that seemed way too high for a single one bedroom apartment so I decided to run a little experiment. I turned my thermostat off for the month. Nothing, no gas at all, the water heater is on a separate gas bill for the complex. Lucky it wasn't a cold month, a few nights of suffering lol. I just wore a hoodie and bundled up. The result .. the highest gas bill yet!!!! WTF!! How is this possible, it's not. So I suffered a few nights for nothing, well, not nothing, for a high gas bill. It's like Constellation just makes shit up or more than likely uses some algo for billing going off average means of an area, because how in god's name can I be charged the highest gas bill I've had yet after running this experiment of Not using Any Gas!!

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      Sales & MarketingPriceBillingRates

      Reviewed March 2, 2026

      Constellation Energy is a scam. Once the fixed rate period is over they charge you 10x what the utility company charges you. Do not switch this is a total scam. See my bill of $1,255.18 cents compared to the PSE&G Bill of $169.07 for the same period.

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      Billing

      Reviewed Dec. 23, 2025

      I have been a customer of theirs since 2016. I changed to go with somebody else. That is when I figured out how poor their billing was. There isn't anywhere on the bill to explain where you are at with balance billing until you cancel and they tell you after you pay your bills you owe 180 for true-up. Beware.

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      Coverage

      Reviewed Nov. 12, 2025

      During the hottest and sunny part of summer, they claim to be down from August 2 to November 3, for technical problems. This is BS and they should cover the 15% reduction promised. I hope the Illinois Attorney General looks into these shady practices.

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      Sales & MarketingPriceRates

      Reviewed Oct. 2, 2025

      Be cautious when browsing this company online because they have faulty advertisements. This company may advertise one price but charge a significantly different amount once you complete your order. It is advisable to verify the prices before making a purchase..

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      Customer ServiceSales & MarketingBillingHonesty & Transparency

      Reviewed Sept. 6, 2025

      Didn’t think choosing a gas company would ever matter but I cannot in good conscience ever recommend or sign up with constellation ever again. Misleading bait and switch plans, which they were sued for apparently. $220 over 5 months and turned my gas on one time. $150 cancellation fee on top of that because they just use ai bots for customer service so getting your bill fixed ain’t happening. Ridiculous phone operators that can’t figure out how to contact their field tech people. Just a trash company that shouldn’t even be in business, they’re just lucky they got grandfathered into the industry would be my guess.

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      Customer ServiceContract & TermsPrice

      Reviewed July 10, 2025

      Long term customer with 800 credit score. They know who I am. Tried 3 times to submit ID Check online info to get service at another location. Failed each time since ID Check doesn't work. Cost me money, needed power on ASAP. It was never a problem before: call, confirm it's me, get service that day. Will never use them again.

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      Customer ServiceCoverageTechPriceBillingRatesHonesty & Transparency

      Reviewed May 23, 2025

      Every bill was much higher than expected from the beginning. On top of that Constellation Energy uses misleading marketing of home warranty services to get you to enroll for electric service paying higher than average per Kilowatt charges. Then will find every excuse not to honor warranty and cover repairs. Instead they will use opportunity when you need a repair to try to push for high cost of extra unnecessary repairs using their preferred vendors. AC repair guy who came out even said Constellation sets repair prices and collects a large part of proceeds. Would certainly recommend to stay clear of this company. Especially since there are so many ethical companies to choose from.

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      Customer ServicePriceBilling

      Reviewed April 24, 2025

      We were signed up for Constellation by an unknown entity for our condo building - once we realized (once someone actually looked at our bill) we saw that on a $965 bill - they tacked on $1500 in delivery charges. I called, found out that someone signed us up. They would not tell me who did it - but they gave me a phone number that was unrelated to anyone in our association. I called three times and finally told someone to cancel the account. Then they said it would take another "one to two" billing cycles to close out the account. A total racket!

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      MXEnergy author review by Jonathan Trout

      Constellation is an independent energy supplier for Illinois and throughout the United States. It offers residential customers, small business owners, commercial and industrial companies and government agencies electricity, gas and solar solutions. It serves 2.5 million customers, including two-thirds of Fortune 100 companies, and gives back to communities across the nation.

      • Residential services: Constellation offers multiple fixed-rate plans to fit your budget. You can choose the term of contract, and your monthly electricity bill will be the same throughout the length of your contract.

      • Renewable electricity plans: Depending on the state you live in, a percentage of the electricity your home uses can be generated from wind energy sources. Constellation uses wind farms and wind turbines in certain states to provide clean energy sources where laws and regulations allow.

      • Solar power: If you’re thinking about switching to solar energy, Constellation partners with Sunrun to help you outfit your house with a solar system. Sunrun offers flexible payment plans, including a zero down plan and a prepaid plan. The prepaid plan allows you to buy 20 years of power up front at the best price Sunrun offers. Constellation and Sunrun currently provide solar power in six states to residents who spend over $100 per month on their energy bill.

      • Small business options: Constellation provides small businesses with custom energy plans and will help you find the right plan for your business. It understands running a small business comes with unique budget challenges and can make the difference in the size of your profit margin. If you’re a small business owner, you can contact a customer care representative to determine which energy resource works best for your company.

      • Payment options: Constellation gives you multiple payment options to choose from. You can do a one-time payment option via direct withdrawal, check or credit card. You can choose a monthly recurring payment using a credit card or you can pay by phone. You can also set up an online account to receive paperless statements and manage your billing cycles.

      by Jonathan Trout ConsumerAffairs Research Team

      As a member of the ConsumerAffairs Research Team, Jonathan Trout believes having access to free, comprehensive information on products and businesses is vital to making smart purchasing decisions. He focuses his efforts on researching and reviewing multiple brands across a variety of industries, with the goal of writing unbiased buyers guides to help inform consumers on impending purchases.

      Constellation (formerly MXEnergy) Company Information

      Company Name:
      MXEnergy
      Website:
      www.constellation.com