Constellation Customer Reviews (July 2025 Update)

Updated: July 2025

The best review categories for Constellation are their plans and pricing, with an average of 4.0 stars, and the order experience, with an average of 4.0 stars.

Reviews Overall

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Plans & Pricing

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Order Experience

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Customer Service

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Billing & Acct Mgmt

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Likely to Recommend

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CT Energy Ratings's Gold Tier Providers are the best of the best in Connecticut electric. These are the best providers over the past year at providing customers and communities great service, stellar customer service, and top of the line resources, just to name a few things. When you select one of these providers, know you're choosing from among the best options in the Connecticut electric market.

Recent Good Review from Louis Gioia J

Constellation Energy

Easy to enroll, they provide good and timely information and my energy expense has decreased quite a bit.

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Likely to recommend

— Louis Gioia J from Stamford, CT on May 7th, 2025

Most Recent 5 Star Reviews

23 Customer Reviews Written Overall

Read All 5 Star Reviews

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Constellation Energy

Easy to enroll, they provide good and timely information and my energy expense has decreased quite a bit.

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— Louis Gioia J from Stamford, CT on May 7th, 2025

Very Professional

I was helped to find the best rate and after an interview and my acceptance, I got a letter in the mail confirming my agreement. First rate service.

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— Jackie from Hamden, CT on April 26th, 2025

Wonderful service and great promotions

Constellation always has good rates.

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— Chris from Danbury, CT on April 14th, 2025

Owner

Great service from start to finish and amazing price. Thank you.

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— Liz from Cos Cob, CT on March 17th, 2025

Review

Easy to telephone to get your service

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— Valerie from North Haven, CT on September 12th, 2024

So far so good!

Good price and no surprises.

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— Tom M. from Bristol, CT on September 9th, 2024

Good Deal!!

Although we did not need any customer service, signing up was quick and easy and the rate excellent.

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— Sandy from Madison, CT on March 17th, 2024

Great

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— Great from Bridgeport, CT on November 1st, 2023

Pleasant Transition

The switch to Constellation for our electric supplier went very smoothly. The representative was knowledgeable, courteous & friendly. The best part is that we will be saving money!

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— Linda from Wilton, CT on October 19th, 2023

MR Goodwrench

It was ok

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— Ken from Clinton, CT on September 20th, 2023

Great service

Electric bill was cut by 30%. Very pleased with Constellation!

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— Slash Electricity Rates! from Newington, CT on August 21st, 2023

Saving a fortune

We are saving over $200 a month with them! I wish we have moved to them years ago!

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— Markrogo from Cromwell, CT on June 16th, 2023

More light, less payments.

It was quite easy and quick to switch.

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— Janet from Naugatuck, CT on May 31st, 2023

Great

Was able to quickly/easily make the change to Constellation and am very happy with the change.

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— JoanL from Wolcott, CT on May 30th, 2023

Nice to work with

All good

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— Katherine Osborne from Kent, CT on May 30th, 2023

Saving with Constellation

Seems fine, no complaints and were saving money!

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— Steve from Storrs Mansfield, CT on April 16th, 2023

Significant Savings

I just received my first electric bill with Constellations rate . . . $20 less for the same usage.

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— PBaker from Niantic, CT on April 3rd, 2023

Constellation Review

Changing to Constellation was super easy from Eversource

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— Peter from Farmington, CT on February 28th, 2023

Best Rate Available At The Time

Constellation had the lowest rate at the start of 2022 when Eversource's standard rate increased. There were no enrollment or cancellation fees. It was the best deal at the time that my previous alternate electricity supplier's contract was ending. Although this Constellation plan lasts for a longer term than I wanted, I can exit the plan at any time without penalty should a different supplier offer a lower rate.

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— Connecticut Customer from East Windsor, CT on February 19th, 2022

Energy Review

No issues over the entire length on the contract...sorry I had to switch providers.

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— Constellation from Unionville, CT on March 7th, 2021

GREAT SERVICE

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— 7/31/2020 from Bridgeport, CT on July 31st, 2020

Savings

Very pleased with my first months bill,.I'm sure I will continue to be satisfied in the upcoming months

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— Joanscandy from New Milford, CT on October 26th, 2019

Smooth transition

Changing suppliers was quick and easy. A very competitive price and a smooth transition.

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— Susan from Ellington, CT on October 21st, 2019

Most Recent 4 Star Reviews

9 Customer Reviews Written Overall

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Great Company

We are very pleased with Constellation. They are great to work with and have a great rate

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— Kevin R from Brookfield, CT on April 4th, 2025

Cheaper by the Kv

Easy to apply and follow through.

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— Michael Kelting from Enfield, CT on March 29th, 2025

Bill savings

When I signed up for this it was supposed to be 1 year now I see its only 6 months. I guess I'll have to reup in June

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— Bill Savings from Cheshire, CT on March 23rd, 2025

Jim albrycht

Good choice

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— Good from Bristol, CT on March 21st, 2025

DEALING WITH CONSTELLATION

ABSOLUTELY NO PROBLEM AT ALL.

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— BOB H from Brookfield, CT on July 30th, 2024

Shopping for energy supplier

On my latest search for the best energy price available Constellation was the best deal. Easy sign up experience.

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— Tom from Newtown, CT on December 15th, 2023

Thank you

Difficulty with Eversource but satisfied with Constellation

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— Thank You For Service from Ledyard, CT on July 26th, 2020

Transfer to new supplier

Eversource did not facilitate the transfer well. constellaion customer service worked to resolve this.

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— Fred from Ledyard, CT on June 29th, 2020

Priceing

I have what i thought was a good relationship with this company everyone ive ever dealt with was upfront honest and true to their word. My issue is i thought i did well when i signed up for a 3 year fixed rate price per kilowatt hour @ 9.99 now im reading and see it is 7.69ish? i no i have a contract but one would think to keep a customer and remain honest they could have at least contacted me to see if i am interested to extend my contract at this price for and extended 3 years. I realize i have a contract and it is what it is but my thinking if you wish to keep a customer and keep an honesty repot going any company would give it a thought to put their customers 1st. Also i wish to let anyone and everyone who sees this i only wrote this publicly as i couldnt find any other waty to contact on this page... its possible their is another way in front of my face so sorry if their is i mean no dissing to this company as i said they have all been very good dealing with me and i never found any big issues against them. Lastly they were a company who introduced themselves to me and left me alone to make a choice without calling or emailing me to the point that id want nothing to do wth them they left me to make a choice without feeling forced.

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— Bob B from Ansonia, CT on May 23rd, 2020

Most Recent 3 Star Reviews

4 Customer Reviews Written Overall

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Save money

Easy to apply

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— Alan Hunt from Danielson, CT on September 22nd, 2024

New Customer

I've just signed on to Constellation, so can't really give an honest opinion as yet.

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— Gregg from on July 23rd, 2024

Not sure

Its been two months since I signed up and still paying my original supplier.

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— Sparkwire from Plainville, CT on April 4th, 2023

Contracting with Constellation

I thought establishing the up front contracting was a bit redundant and could be more streamlined. This is why I gave account management only three stars.

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— Overall Satisfactory from Colchester, CT on July 13th, 2020

Most Recent 2 Star Reviews

1 Customer Reviews Written Overall

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Incomplete

I signed up but they didn't follow through. I gave them all of the info they needed when they called, but for some reason, it didn't go through. Can't recommend what isn't working.

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— Fiske from Tolland, CT on April 25th, 2021

Most Recent 1 Star Reviews

12 Customer Reviews Written Overall

Read All 1 Star Reviews

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Yet to receive a bill

Yet to receive a bill. Had trouble switching as I had two residences on my Eversource bill and that seemed to be an issue yr people could not solve.

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— David Whitty from East Hampton, CT on September 16th, 2024

Do NOT do it! They are HORRIBLE!

They will drop you as a customer, after signing a contract, without even telling you. THANKFULLY, I needed a copy of a bill for a new resident form so I was locating my account information to set up an online account and I just happened to find out Im not longer a customer. I should have gotten an email is inaccurate, and had I not called, I wouldve have been late on my new company (who they shared my info with unknowingly) first bill which was due the next day. Over all, dont go with them. Sure the rates look better, but customer service is absolutely horrible and they dont care about respecting their customers. 0 reason to discontinue our new contract one month into owning our new home.

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— Abigail C from East Hampton, CT on March 29th, 2024

Sucks

MY BILL DOUBLED

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— NORM from 6489 on January 15th, 2024

Urgent- please contact me

Applied months ago and is still not active.
Sent request to customer service and no response!

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— LuAnn from New Milford, CT on November 27th, 2023

Service?

I have yet to get my lower bill from Constellation. My service has not switch over yet. I have received 3 more bills from my old provider!

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— Switching Service from Kent, CT on June 20th, 2023

Nightmare trying to switch. No follow up.

Tried to switch from Eversource. Was contacted multiple times from constellation with issues. Last was a block they said Eversource had and I need to call Eversource to remove. Then reply to the email so constellation can resubmit. Called Eversource, blocks removed, replied to constellation email to resubmit. Another month later no confirmation from constellation. Called them and they had no record of me. I gave them account numbers, issue tickets, emails. Now they say they have to start over. Ya know what I feel like paying more with Eversource that deal with this awful company. Just a nightmare. Then constellation sends an email to review my experience with switching.....I NEVER GOT SWITCHED! Lame!

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— Jejrdn from Manchester, CT on February 28th, 2023

Forever to switch

We signed up in December, February now and Eversource is still our supplier!

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— Ldg from Stafford Springs, CT on February 16th, 2023

Terrible system

I signed up online. Constellation kept putting in the wrong city. I kept correcting it. Then, I put in all my eversource info, and the site kept deleting and putting in wrong info. And the wait fir customer service is almost 1.5 hours.

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— NC from Oxford, CT on January 4th, 2023

Bad customer service-took three times to get the deal

Bad customer service, slow service. I had to correct the issue. Your customer service called me two times and did not correct the issue. It is like you did not want me to have savings before the summer and so because of your delay my bill was high. Delayed 3 months because your bad customer service. lady that called was rude and should not be in customer service, she did not correct the transfer issue. I corrected. I also missed out on a gift.

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— CTGrandma from Derby, CT on September 19th, 2020

Never any follow up

I requested a change, got a welcome and confirmation email, then nothing, still stuck with eversource

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— Trina from East Lyme, CT on September 2nd, 2020

Horrible!

It took 5 calls because they repeatedly were telling me I wasn't signed up after emailing me confirmation numbers. Kept trying to change the price everytime I had to call again. End of story I am NOT a customer of constellation and would NEVER recommend anyone waste time with the run around I was put through!!!

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— DM from Meriden, CT on January 14th, 2020

Unfair

IN THE MIDDLE of my signing up for their 8.89c rate today they changed their rate to 9.49c. Honestly - it was 8.89 and less than 2 minutes later it was 9.49! When I called to see what was going on, they refused to give me the lower rate I had been signing up for. Wouldn't budge. And neither would I. Bye-bye.