When shopping for an electricity plan in deregulated Texas, you face a foundational choice that will shape your energy expenses for the next 12 to 36 months: Should you choose a fixed-rate or a variable-rate contract?
Many consumers select plans based on the lowest headline rate without understanding how the underlying rate structures behave. In a stable market, a wrong choice might cost you a few extra dollars a month. But in a volatile energy market like ERCOT—where summer heatwaves and winter freezes can cause wholesale power prices to spike by 10,000% in a single hour—the wrong rate structure can lead to financial shock.
In this guide, we will compare fixed and variable rate structures, explain the wholesale market dynamics that drive them, and show you how to choose the right plan for your household using GetElectricity.
1. Fixed-Rate Electricity Plans: Stability and Certainty
A fixed-rate plan locks in your price per kilowatt-hour (kWh) for the entire duration of your contract, typically 12, 24, or 36 months.
Once you sign the contract, your energy rate cannot change, regardless of weather conditions, grid demand spikes, or fuel commodity prices.
How Providers Price Fixed Plans
Retail electric providers (REPs) do not set fixed rates based on today's electricity cost. Instead, they look at forward wholesale markets, estimate price trends over your contract term, and add a risk premium to protect themselves.
Essentially, you are paying a small premium in exchange for price insurance. If wholesale prices rise, you are protected. If wholesale prices drop, you are still locked into your rate unless you choose to pay an early termination fee to break the contract.
Tip: Who it is for: Fixed-rate plans are ideal for homeowners and renters who want predictable monthly expenses, operate on structured household budgets, and prefer to avoid market volatility.
2. Variable-Rate Electricity Plans: Flexibility with Market Exposure
A variable-rate plan has no contract lock-in or early termination fees. Your rate can change month-to-month based on market conditions, wholesale energy pricing, and provider discretion.
The Upside of Variable Rates
When energy demand is low and wholesale prices drop (such as during mild spring and autumn shoulder seasons), variable rates can fall, allowing you to capture immediate savings without being locked into a long-term commitment.
The Risk of Variable Rates
Variable rates pass grid volatility directly to the consumer. During extreme weather events (such as winter storms or severe summer heat waves), wholesale spot electricity prices in Texas can skyrocket from their normal baseline of $30/MWh to ERCOT's regulatory cap of $5,000/MWh (or historically $9,000/MWh).
If you are on a variable plan that tracks wholesale prices, your monthly bill can jump from $150 to $1,500 or more in a single billing cycle.
The Third Option: Index / Wholesale Plans
For sophisticated energy buyers, some providers offer indexed plans. These plans tie your monthly rate directly to a public index, such as the spot market price of natural gas or ERCOT's real-time locational marginal pricing (LMP).
Unlike variable plans where the provider adjusts the rate at their own discretion, indexed plans are highly transparent—you see exactly how the price is calculated. However, they still expose you to the full volatility of the wholesale spot market.
Fixed vs. Variable: Direct Comparison
Below is an interactive breakdown comparing the key differences, terms, and risk factors of fixed, variable, and indexed electricity plans:
How to Choose the Right Plan with GetElectricity
Navigating Texas rate plans requires understanding your home's usage profile. GetElectricity simplifies this choice:
- Usage Profiling: We load your actual historical 12-month usage data to calculate your true seasonal consumption pattern.
- True Cost Analysis: We compare fixed-rate risk premiums against historical variable averages to show you exactly how much you are paying for budget certainty.
- Auto-Renewal Protection: If you are on a fixed-rate plan that expires, providers will automatically roll you onto an expensive default variable holdover rate. GetElectricity alerts you 30 days before expiration, helping you seamlessly transition to a new fixed plan without ever hitting a variable price spike.
Protect your home from market volatility. Compare fixed-rate plans in your area with GetElectricity today.
Settle Fixed vs. Variable on GetElectricity
The fixed-versus-variable answer changes with your household's usage pattern — a flat profile and a spiky one belong on different contracts.
GetElectricity connects directly to your Smart Meter Texas data to build your real 12-month usage profile, then simulates hundreds of active plans across Irving, Garland, Mesquite, and Grand Prairie, showing exactly what each rate structure would have cost you over the last 12 months.
Enter your ZIP code on GetElectricity to see which rate structure actually wins for your home.
The Three Times a Variable Rate Actually Makes Sense
The comparison table above makes fixed rates the default for good reason — but "never" is too strong a word. There are exactly three situations where a variable plan is the rational choice:
- A genuine short-term bridge. You are between leases, selling a house, or waiting out the final weeks of a contract elsewhere. No ETF means you can leave the moment the timing resolves — that is the entire value proposition, and it evaporates if the stay stretches past a month or two.
- A deliberate shoulder-season gap. If your fixed contract expires in a mild spring or autumn month, riding a variable rate for a few weeks while you wait to lock a long term during low grid demand can be sound arithmetic. Set the exit date in your calendar the day you start — the savings come from the season, not from forgetting.
- You actively trade the market. Sophisticated buyers who watch ERCOT pricing and can curtail load during peaks are exactly who indexed plans exist for. Transparency is the draw; the volatility is the admission price.
Outside those three cases, the risk premium on a fixed plan is the cheapest insurance in your budget. One August heat wave at the $5,000/MWh cap erases years of variable-rate savings in a single billing cycle — the $150-to-$1,500 jump above is not a scare story, it is the math of the cap.
Frequently Asked Questions
Is a fixed-rate or variable-rate electricity plan cheaper in Texas?
It depends on market conditions. Variable plans can capture savings during mild spring and autumn shoulder seasons when wholesale prices drop, but they pass grid volatility directly to you — during extreme weather, ERCOT spot prices can jump from a normal $30/MWh baseline to the $5,000/MWh regulatory cap, taking a monthly bill from $150 to $1,500 or more in a single billing cycle. Fixed plans charge a small risk premium in exchange for price insurance, locking your rate per kWh for the full 12, 24, or 36-month contract term.
What happens when my fixed-rate electricity contract expires?
Your provider automatically rolls you onto an expensive default variable holdover rate, exposing you to month-to-month market pricing. GetElectricity alerts you 30 days before expiration so you can seamlessly transition to a new fixed plan without ever hitting a variable price spike.
What is an indexed or wholesale electricity plan?
An indexed plan ties your monthly rate directly to a public index, such as the spot market price of natural gas or ERCOT's real-time locational marginal pricing (LMP). Unlike variable plans where the provider adjusts the rate at its own discretion, the calculation is fully transparent — but you still carry the full volatility of the wholesale spot market, so indexed plans are best suited to sophisticated commercial buyers.
Before choosing a plan, learn how to decode the Electricity Facts Label and avoid the expensive default pricing that can follow an expired contract with our holdover-rate guide.