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Based in Baltimore, Constellation Energy is a retail natural gas & electric provider that offers residential and commercial plans to consumers living in deregulated energy states across the US and Canada. Constellation Energy, which bought out Houston's StarTex Power in 2011, competes against the other 75+ retail electric providers in Texas. Most Constellation Energy plans come with fixed rates, but also offer one Month-to-Month plan on a variable rate and one renewable energy plan. Swipe (or scroll) down for details on Constellation Energy reviews, what the Constellation Energy login platform has to offer to customers, and ways to contact Constellation Energy customer service or make a Constellation Energy bill payment.

Constellation Energy service area and StarTex Power in Texas

StarTex Power was founded as an alternative retail electric provider in Texas in 2004. In May 2011, Constellation Energy signed a definitive merger agreement to acquire 100 percent of StarTex Power which, subsequently, moved all StarTex electricity customers to Constellation electric plans.

Constellation Energy, an Exelon subsidiary, sells electricity, natural gas, and other energy products in 10 states across continental US:

Constellation Energy : States & Industries
Constellation Energy state Electric
Natural Gas
New Jersey    
New York    
Washington D.C.    

Texans can sign-up with a Constellation Energy plan who live within the deregulated retail electric service areas of the investor-owned utility companies, that include:
 Oncor Electric Delivery
 CenterPoint Energy
 AEP Texas North & Central
 Texas-New Mexico Power (TNMP)

The delivery fees that are charged by each utility company are passed through (without any sort of mark-up price nor service charge) to Constellation Energy customers - a standard practice for electric providers. The current utility company rates are:

Utility company tariffs in Texas : MARCH 30 2021
TDU TDU monthly base fee TDU ¢/kWh energy rate
AEP North $3.57/mo 3.0078¢/kWh
Oncor Electric Delivery $3.42/mo 3.4928¢/kWh
CenterPoint $4.39/mo 3.2669¢/kWh
AEP Central $4.27/mo 3.7458¢/kWh
TNMP $7.85/mo 4.0403¢/kWh

The Constellation Energy login and My Constellation App

Constellation Energy customers are provided an account management platform using the My Constellation login portal. In the portal, customers are able to:

  • Establish (or update) Auto Pay for more efficient monthly payments
  • Make on one-time bill payment
  • View billing details and history
  • Manage contact details, like email addresses or phone numbers

If you're currently a Constellation Energy customer and have your Constellation Energy account number ready (along with your email address), register for a My Constellation account to have on-the-go access anytime, anywhere!

Constellation Energy's "My Constellation" app is available (only for Texas and Georgia customers) on the Apple App Store and the Google Play Store, providing mobile access to:

  • Make a bill payment, 24/7
  • Sign up for AutoPay
  • See monthly energy bill projections on a weekly basis
  • Review current plan and rate details
  • View billing invoices and payments
  • Manage account & payment settings

How to make a Constellation bill payment : Constellation Energy pay bill methods

Constellation Energy offers customers a few ways to make a bill payment, whether it's an AutoPay sign-up or one-time payment. Customers can also check out the DOXO app to make a secure payment with Constellation Energy.

Constellation Energy bill pay methods
Bill pay method Contact Availability
AutoPay setup, online:
My Constellation
My Constellation
One-time payment, online:
My Constellation
My Constellation
Quick payment, online with DOXO:
(not a Constellation Energy affiliate)
bill payment
with DOXO
Bill pay phone number
Texas customers
1-833-221-6654 24/7
Bill pay in-person -currently unavailable- -
Mail bill payment
send at least 5 business days
before bill due date
P.O. Box 5471
Carol Stream, IL

What do customers think? : Constellation Energy reviews

Over the last 6 months, according to the Public Utilities Commission (PUC) of Texas, Constellation Energy was #15 on the list of the most formal complaints received against retail electric providers in Texas out of the 76 REPs registered. While some customers appreciate Constellation Energy's competitive rates, usage tracking platform and referral program, unsatisfied customers have found a particular issue with billing services. In fact, 50% of all formal complaints filed with the PUC were regarding Constellation Energy's billing practices.

There are Constellation reviews across many forums, but the leading websites are currently giving Constellation Energy:

Constellation Energy reviews : BBB, Yelp and more
Site Overall rating Source
Better Business Bureau
Constellation Energy BBB
customer reviews rating
Google Reviews
Constellation Energy reviews
on Google
Constellation Energy
Yelp reviews
Constellation Energy reviews

Constellation Energy rates & Constellation electricity plans

All retail electric utility service areas in Texas are covered by Constellation Energy plans, however the plan offering varies by utility company.

Constellation Energy plan offering by utility company
Oncor Electric Delivery
CenterPoint Energy
AEP Texas Central
AEP Texas North
Texas-New Mexico Power
  • 12 Month Flat Tier Product
  • 12 Month GREEN
  • 6 Month Usage Bill Credit
  • 12 Month Usage Bill Credit
  • 24 Month A/C Protect Plus for 2 Units
  • 12 Month Usage Bill Credit + A/C Protection for 2 Units & HVAC Monitoring
  • Month-to-Month
  • 12 Month GREEN
  • 6 Month Usage Bill Credit
  • 12 Month Usage Bill Credit
  • 24 Month Usage Bill Credit
  • Month-to-Month

Using the Constellation Energy promo code "ROCKSTAR" either adds or removes select plans listed from certain utility company service areas.

Constellation Energy fixed rate plans

 The Constellation Energy 12 Month Flat Tier Product plan
 The Constellation Energy 12 Month GREEN plan
 The Constellation Energy 6 Month Usage Bill Credit plan
 The Constellation Energy 12 Month Usage Bill Credit plan
 The Constellation Energy 24 Month Usage Bill Credit plan
 The Constellation Energy 24 Month A/C Protect Plus for 2 Units plan
 The Constellation Energy 12 Month Usage Bill Credit + A/C Protection for 2 Units & HVAC Monitoring plan

Constellation Energy's fixed-rate plans do not change over the contract term, however the utility company's rate is subject to change 2 to 3 times each year. So the "fixed" rate is fixed to a degree. The only Constellation Energy plan that avoids the utility company "variability" is the "12 Month Flat Tier Product" which combines all charges into a $-per-usage-tier structure (for usaage under 2,000kWh/mo.).

Fixed rate plans can often be a good idea if you are able to lock in a good rate at the right time of year. Once the fixed rate contract is finished, unless renewed or terminated, customers will automatically be switched to a variable rate on the "Default Rate Product".

Electricity customers should choose a fixed rate contract of at least 12 months. Electricity prices per kilowatt-hour change throughout the year, and you may actually lose money by not being able to take advantage of prices when they are low. However, because electricity prices tend to increase over time, locking in fixed rates for longer periods may prove to be money-saving.

Constellation Energy : Early cancellation fees If deciding to become a Constellation Energy customer, you'll be relieved to see the "Early Termination Fee" for all fixed rate electric plans is $50, regardless of contract term and months remaining for the contract to end.

Constellation Energy variable rate plan

 The Constellation Energy Month-to-Month plan

A variable rate is a rate whose price (in ¢/kWh) may change each month. A variable can be at the discretion of Constellation Energy, or they can give rules on the rate's variability - for example, the energy rate for customers changes alongside the wholesale price of energy.

The only variable rate plan that Constellation Energy uses is their Month-to-Month plan and the Default Rate Product (for when fixed-rate plans end and no action is taken by the customer to change to a different provider or plan).

The huge advantage of variable rate plans offered from electric providers, is the ability to leave the plan and/or provider at any time without having to pay an "Early Cancellation Fee". Since providers are aware of this advantage on variable rate plans, the energy price given in a variable rate plan is almost always higher than a fixed rate plan for X months that the same provider will offer.

Renewable plans by Constellation Energy

 The Constellation Energy 12 Month GREEN plan

Oddly, Constellation Energy does not provide details in their Terms of Service (TOS), Electricity Facts Label (EFL), nor Your Rights As a Consumer (YRAC) regarding how the plan works with "Texas Wind Power". Usually, electric providers guarantee that they will purchase renewable energy certificates or attributes for the amount of energy consumed by the customer and clarify that the energy used in the customer's household is not guaranteed to be produced by renewable energy.

Outside of the 100% renewable content, GREEN plan, all of the other plans offered by Constellation Energy that are not "green" only source 16.8% renewable content, which is slightly below the Texas average of 20.7%.

"Minimum usage fee" charges with Constellation Energy

 The Constellation Energy Month-to-Month plan

$4.99 per billing period if billed usage is less than 500 kWh

The only Constellation Energy plan that contains a minimum usage fee is the Month-to-Month, variable rate plan. Generally, plans that have a minimum usage fee tend to not favor energy-conserving consumers or smaller households.

Besides the standard energy rate, any other "supply fee" (what electric providers charge their customers) is optionally charged. Many providers choose to impose these frivolous fees on customers so as to discourage trying to save money by using less energy.

The Month-to-Month plan has the minimum usage fee strategically placed, so as to not interfere with the highly regarded 500kWh price reference point. On the EFL for this variable rate plan, the price in the Oncor service area is 15.4¢/kWh at 500kWh/mo. Using 1 kWh less (at 499kWh/mo) would see the average price per kWh increase by 1¢/kWh, to 16.4¢/kWh, due to the added minimum usage fee of $4.99.

Usage credits with Constellation Energy

 The Constellation Energy 6 Month Usage Bill Credit plan
 The Constellation Energy 12 Month Usage Bill Credit plan
 The Constellation Energy 24 Month Usage Bill Credit plan
 The Constellation Energy 24 Month Usage Bill Credit + A/C Protect Plus for 2 Units plan
 The Constellation Energy 12 Month Usage Bill Credit + A/C Protection for 2 Units & HVAC Monitoring plan

Constellation Energy, similar to big providers like Reliant Energy, TXU Energy, and Ambit Energy, use billing credits to promote higher levels of energy consumption of over a certain amount. The billing credits on the 5 "Usage Bill Credit" plans (above) are added when monthly energy consumption crosses over 1000kWh (a $35 credit) then again at 2000kWh ($15 credit).

Similar to the minimum usage fee strategy, the plans that contain the billing-credit feature are targeted to benefit households that have an average-to-high monthly energy usage. The hassle with plans that implement additional charges or credits based on monthly energy consumption, is that customers on such plans should monitor monthly usage to get their best-priced, final monthly bill.

Base Charges with Constellation Energy

All plans offered by Constellation Energy do not contain a base charge fee applied to them. The base fee / base charge is an optional charge that providers often choose to impose on to customers. Some electric providers, again like TXU Energy and Reliant Energy, charge base fees on their plans, but there are many electric providers like Constellation Energy, that opt out of implementing the charge.

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How to contact Constellation Energy customer service : Constellation Energy phone numbers

Constellation Energy power outage : Phone numbers Constellation Energy mainly handles billing, new customer set ups, and transferring or ending service. In the event of a power outage, customers need to contact their respective utility company that services the area (since they are responsible for maintaining and repairing the electrical infrastructure). Find out "Which utility company is mine?" if your power goes out or, if you already know, use the power outage number (listed below) to report it:
 Oncor power outage: 1-888-313-4747
 CenterPoint power outage: 1-800-332-7143
 TNMP power outage: 1-888-866-7456
 AEP Texas power outage (North & Central): 1-866-223-8508

Need to contact Constellation Energy to start service or ask a billing question? Here are some ways to contact the Constellation Energy customer service:

Constellation Energy customer service phone numbers in Texas
Reason Phone number Hours
Texas Residential
customer service
1-866-917-8271 Mon-Fri: 7am-8pm
Sat: 8am-5pm
Bill payment 1-833-221-6654 24/7
Billing inquiries
Late payment
1-844-823-4663 Mon-Fri: 9am-4pm
Commercial customer service 1-844-636-3749 Mon-Fri: 8am-8pm
Constellation Energy power outage:
AEP Texas:
Contact for utility company

Alternative ways to contact Constellation Energy customer service in Texas are: