Selling Constellation as the "nuclear power supplier" for your home.
Constellation Energy Corp owns the largest fleet of nuclear reactors in the United States, roughly 19,000 megawatts of zero-carbon capacity. That fact is true and verifiable. Many guides then claim that signing up for a Constellation Texas plan means your home runs on that nuclear fleet. That claim is misleading.
Constellation's nuclear plants sit in PJM, ISO-NE and New York ISO. They do not feed the Texas grid. ERCOT is electrically islanded from the rest of the United States by design, with only minor DC ties to neighbouring grids. The electrons that reach a Texas customer come from whichever ERCOT plants happen to be running at that hour, mostly natural gas, wind, coal and solar.
What Constellation actually sells you on a Texas retail plan is a contract for kWh delivered to your meter and, on its green tier, matching RECs purchased on the open market. The label "100% renewable" describes a paper match, not a physical path. That is normal for the industry; it is also why headline branding is a poor reason to pick one Texas REP over another.
How a Constellation Texas plan is actually built.
Like every Texas REP, Constellation stacks three layers under one quoted rate. Only one of those layers is theirs to set.
Layer 1, Constellation
Energy charge
The per-kWh price for the electricity itself, hedged by Constellation's wholesale desk on the ERCOT market. This is the only line the brand actually controls.
Layer 2, Constellation
Base / monthly fee
A flat dollar amount added every month regardless of usage. Often $0 on fixed plans and $9.95 on indexed or business plans. It quietly raises the effective rate at low usage.
Layer 3, Your TDU
TDU pass-through
Oncor, CenterPoint, AEP Texas or TNMP delivery charges, set by the PUCT and passed through with zero markup. Same number whichever REP you pick.
When Constellation quotes a different headline rate than Reliant or TXU, almost all of the gap lives in layer 1. Layer 3 is identical. Layer 2 is usually a rounding error.
Constellation's Texas plan types, decoded.
The brand markets five recurring plan archetypes in Texas. Here is what each actually does and who it fits.
| Plan family | Type | Term | Best for | Watch out for |
|---|---|---|---|---|
| 12-Month Fixed | Fixed price per kWh | 12 mo | Most households, short hedge | ETF if you leave early; auto-roll to variable at end of term |
| 24-Month Fixed | Fixed price per kWh | 24 mo | Owners locking through a winter cycle | Longer ETF window; price premium over 12 mo |
| 36-Month Fixed | Fixed price per kWh | 36 mo | Long-tenure owners, predictable budget | 3 years of opportunity cost if market falls |
| Green plans (100% renewable) | Fixed + REC match | 12 or 24 mo | Shoppers wanting a renewable label | Premium over plain fixed; matched via RECs, not Constellation's nuclear fleet |
| Indexed / variable | Floats with ERCOT | Month-to-month | Renters needing zero commitment | Spikes when scarcity hits the ERCOT $5,000/MWh cap |
| Constellation Business | Custom commercial | 12 to 60 mo | SMB and commercial accounts | Quotes are broker-routed; always benchmark against two other brokers |
Plan names, terms and rates are updated quarterly by Constellation; always pull the live EFL from the provider's site or Power to Choose before signing.
~12% of US carbon-free power, 0% of your Texas electrons.
Constellation Energy Corp is, at the wholesale level, responsible for roughly 12% of all carbon-free electricity generated in the United States. That share comes almost entirely from its nuclear fleet across PJM, New York and New England.
None of that capacity reaches Texas. ERCOT is its own synchronous grid, connected to the rest of the country only through small DC ties. When a Texas household enrols on a Constellation retail plan, the actual electrons come from the ERCOT generation mix that hour, gas, wind, coal, solar and a small amount of South Texas Project nuclear (which Constellation does not own).
This is not a defect specific to Constellation. Every Texas REP works this way. The useful question is not "where does my supplier generate?", it is "what total dollars will I pay at my actual usage, on a plan that fits my contract risk?".
How Constellation reached Texas.
A 25-year corporate timeline from Baltimore utility to standalone nuclear-led generator, in five steps.
1999, Baltimore parent restructures
Baltimore Gas and Electric reorganises into Constellation Energy Group, splitting its regulated wires business from a competitive generation and retail arm. Constellation NewEnergy is the retail vehicle for that arm.
2002, Texas opens to retail choice
Texas launches deregulated retail electricity under SB7. Constellation NewEnergy enters the Texas commercial market first, then expands into residential service.
March 2012, Exelon merger
Chicago-based Exelon Corporation acquires Constellation Energy Group. The combined company becomes the largest competitive power producer in the United States, with Constellation's retail brand kept intact.
February 2022, Exelon spin-off
Exelon spins off its competitive generation and retail business as a standalone public company, Constellation Energy Corporation (Nasdaq: CEG), headquartered in Baltimore. Exelon keeps the regulated utilities (ComEd, PECO, BGE and others).
2024 onward, nuclear-led growth
Constellation signs long-term clean-energy deals with hyperscalers and federal agencies, restarts conversations around TMI Unit 1 for data-center load, and continues to sell Texas retail under the same brand.
Texas retail Constellation is the customer-facing brand. The wholesale fleet that gives the parent its public profile lives on grids hundreds of miles outside the ERCOT footprint.
5 mistakes Constellation Texas shoppers make.
Five recurring patterns from real Constellation contracts. Each one is fixable before you sign.
Where Constellation sits next to the other big Texas REPs.
Constellation is one of a handful of national-scale REPs in Texas. All buy from ERCOT; the gap between them lives in plan shape and contract terms.
Layer 3 is set by your ZIP, not your supplier.
Every Texas address sits inside exactly one regulated delivery utility. That choice was made for you. Find yours, and you know the floor of your bill.
What to do before you sign with Constellation.
Pull last 12 months of kWh
From your current bill or your TDU's portal. Average summer and winter separately. This is the number the EFL is graded against.
Read the actual EFL
Not the marketing page. The EFL discloses base fees, the post-term auto-roll rate, the ETF and any renewable content.
Cross-check on Power to Choose
Filter to your TDU, sort by total at your usage. Confirm Constellation is in your top 3, not just top of the Constellation-only page.
Calendar your end date
The day you sign, set two reminders: 60 days before expiry and 7 days before. Auto-roll is where most of the long-term cost hides.
If you struggle to pay
Texas runs LIHEAP as CEAP via TDHCA. Apply before disconnection; Constellation must offer a deferred payment plan.
Contact support
Texas residential service: 1-888-900-7052. General residential: 1-855-465-1244. Outage and meter issues: your TDU, not Constellation.
Common questions about Constellation Energy in Texas.
No, not since February 2022. Constellation Energy Corporation (Nasdaq: CEG) was spun off from Exelon as a separate public company in early 2022. Exelon kept its regulated utilities (ComEd, PECO, BGE, Atlantic City Electric, Delmarva Power, Pepco). Constellation kept the competitive generation fleet and the retail brand, including the Texas REP business.
No, not physically. Constellation's nuclear fleet sits in PJM, New York and New England; none of it generates inside ERCOT. Texas retail customers receive electrons from whichever ERCOT plants are running at that hour, regardless of which REP they signed with. On Constellation's 100% green Texas plans, renewable content is matched through RECs purchased on the open market.
For Texas residential electricity: 1-888-900-7052. The general residential support line for other states is 1-855-465-1244. For a power outage or meter problem, call your TDU (Oncor, CenterPoint, AEP Texas or TNMP), not Constellation.
Constellation serves the deregulated Texas market only, roughly 85% of the state by population, covering the Oncor, CenterPoint, AEP Texas and TNMP delivery zones. If you live in a city served by a municipal utility (Austin Energy, CPS Energy in San Antonio, Brownsville PUB and others) or by an electric cooperative (Pedernales, Bluebonnet and others), you cannot choose a REP and Constellation is not an option.
Constellation must send a contract expiration notice 30 to 60 days before the end of your term. If you do nothing, you are rolled onto a month-to-month variable rate, historically 40 to 80% above the fixed rate you were paying. To avoid this, either renew into a new fixed term or switch to another REP before the end date; no ETF applies in the last 14 days of the contract.
Yes, but a fixed-term contract carries an ETF, typically between $150 and $295 (disclosed on the EFL). The ETF is waived if you move outside Constellation's Texas service area or switch within the final 14 days of the term. Indexed and month-to-month plans have no ETF.
More U.S. states with energy choice
Same playbook, different utility. Pick another deregulated state to compare utilities, suppliers and switching rules.
