Fixed vs Variable Electricity Rates: Which Costs Less
There is no universal winner. A fixed electricity rate often costs less when wholesale prices spike or when you value bill certainty enough to pay a modest premium for it. A variable rate can cost less when wholesale prices fall and you can leave quickly — but the same flexibility can turn expensive during extreme weather. The better choice depends on your state's market rules, how long you will stay on the plan, and how much bill risk you can absorb.
Across the United States, residential customers paid an average of about 16.5 cents per kilowatt-hour in 2024¹, up from 16.0 cents in 2023, with an average monthly bill around $144. Those averages blend every kind of plan and market. Your bill is not that average. It is the product of your usage, your delivery charges, and the supply price structure you accept.
What Fixed, Variable, and Indexed Rates Actually Mean
In competitive retail markets, "rate type" usually refers to the energy supply portion of your bill — the charge for the electricity itself — not the wires that deliver it.
On Texas's official shopping site, a fixed-rate plan² keeps your price per kilowatt-hour (kWh) set for the contract term, with narrow exceptions such as changes in transmission and distribution fees, certain grid administrative fees, or new government-imposed fees outside the retailer's control. That stability helps budgeting, but if market prices fall you may wait until the contract ends to capture a lower supply price.
A variable-rate plan² typically has no long-term contract or cancellation fee, but the price per kWh can change month to month based on the market and the retailer's discretion. You can benefit when prices fall, and you can usually switch, but you also take more risk if prices spike after storms, cold snaps, or tight market conditions.
An indexed or market-rate plan² also moves up and down, but the changes follow a published pricing formula tied to a publicly available index. If the index rises, your rate rises; if it falls, your rate falls. Texas regulators warn that indexed plans can change substantially each month and that customers should ask exactly how the formula works and how they will be notified.
The Public Utility Commission of Texas³ describes the same three structures — fixed, variable, and indexed — and notes that retailers may also sell prepaid or time-of-use versions of those plans. Time-of-use products charge different prices by time of day or day of week; the average price shown on a facts label depends on assumptions about when you use power, so your real bill can be higher if you cannot shift usage into discounted hours.
Pennsylvania's official shopping site draws a similar line: a fixed rate⁴ is an all-inclusive per-kWh price that stays the same for at least three billing cycles or the contract term, whichever is longer. A variable rate⁴ can change by the hour, day, or month under the supplier's disclosure statement. Fixed rates buy predictability and protection from sudden market swings; variable rates can fall with the market, but they make budgeting harder and can jump during extreme weather that also drives up usage.
Why Your Market Structure Changes the Question
Not every American can pick a retail plan. The U.S. Energy Information Administration explains that retail choice⁵ lets customers buy generation from an alternate supplier while the local utility still delivers power over the wires and charges for delivery. In most of Texas served by ERCOT, choosing a retail provider is effectively required. Elsewhere, choice may be optional, limited, or unavailable.
EIA reported that 13 states and the District of Columbia⁶ had active statewide or districtwide residential retail choice programs as of its 2021 analysis (not counting Texas's mandatory ERCOT program), and that about 13.2 million eligible residential customers — 26% of those eligible outside Texas — participated that year. Ohio was among the higher-participation states.
If you live in a fully regulated territory — many co-ops, municipal utilities, and states without retail competition — you generally do not choose between competitive fixed and variable retail offers. Your utility's tariff may still include rate designs with seasonal adjustments, time-of-use periods, or fuel-cost trackers, but the shopping problem looks different: you compare utility rate options and usage habits, not competing marketers.
In choice markets, delivery and supply split. Ohio's Public Utilities Commission notes that competitive suppliers provide the generation portion — roughly half of a typical bill there — while transmission and distribution⁷ stay with the local utility. Maryland's Office of People's Counsel makes the same point: you still pay the utility for wires even if you buy supply from a retail supplier⁸. That means beating a "teaser" generation price still leaves delivery charges on the bill.
Anatomy of the Bill: Supply Risk vs. Delivery Cost
Before you crown a winner, separate the bill into pieces you can control and pieces you cannot.
In a choice market, supply is the shoppable slice. Delivery — poles, wires, metering, and often some customer charges — is set through utility regulation and stays with your local wires company whether you pick a fixed or variable retail product. That is why a "3 cents cheaper" generation offer can disappoint: if delivery is half the bill, the savings apply only to the other half.
Usage multiplies everything. EIA estimated average residential consumption at about 865 kWh per month in 2024¹. A one-cent difference in the supply rate is roughly $8.65 a month at that usage — about $104 a year — before fees. Double the usage for a small shop with refrigeration or EV charging, and the same one-cent gap becomes $200-plus a year. Rate type matters more when you use more power, and weather volatility matters more when your load peaks in the same hours the wholesale market peaks.
Budget billing and levelized plans from a utility or retailer can smooth cash flow without changing the underlying rate type. They average expected cost across months; they do not convert a variable wholesale exposure into a fixed hedge. Read the fine print so you know whether a true-up month is coming.
What Moves Prices Behind Your Plan
Retail plan design is a risk-allocation decision layered on top of physical and fuel costs. EIA lists the main drivers of electricity prices as fuel costs⁹ (especially natural gas), power plant financing and operating costs, transmission and distribution investment and repairs, weather-driven demand and renewable output, and the regulatory structure in each state. Extreme heat or cold raises demand for cooling or heating; droughts or calm winds can reduce low-cost hydro or wind output and push other fuels harder.
EIA's annual series puts the average U.S. residential price¹⁰ at 16.48 cents per kWh in 2024, continuing a climb from 13.66 cents in 2021 and 15.04 cents in 2022. National averages do not tell you whether next month's variable offer will rise, but they do show why retailers price risk into fixed contracts: fuel and wholesale conditions move, and someone has to hold that exposure.
Federal Trade Commission staff, commenting on Pennsylvania retail rules, noted that wholesale procurement¹¹ is typically the largest component of the cost to supply retail power, and that some variable offers — especially dynamic plans that track wholesale conditions — preserve a link between wholesale and retail markets that flat rates sever. That is the economic logic for variable pricing. It is also the hazard: when wholesale prices spike, an unhedged retail product can pass the spike through.
When Fixed Rates Tend to Cost Less
Fixed rates tend to win on total cost when three conditions line up.
First, volatility is real and one-sided for your household. Pennsylvania's shopping guide notes that wholesale prices may rise dramatically during extreme weather, and that the same weather can raise your usage, stacking a higher rate on more kWh. A fixed contract is designed to absorb that generation-price shock for the term (subject to the usual delivery-fee exceptions). After Winter Storm Uri in February 2021, the Texas PUC stated that customers of municipally owned utilities, co-ops, and retailers with fixed or ordinary variable contracts¹² were largely unaffected by scarcity-driven wholesale prices, while customers on plans indexed to the wholesale rate reported serious financial consequences.
Second, you will stay through the term. Early termination fees on fixed plans can erase savings if you move, sell a house, or switch mid-contract. Texas and Maryland consumer materials both flag cancellation penalties as a standard feature of many fixed offers. If your housing plans are uncertain, a "cheap" 36-month fixed rate may not be cheap after an exit fee.
Third, you compare the full fixed price to a realistic variable path, not to a honeymoon teaser. Maryland's Office of People's Counsel warns that suppliers sometimes advertise a low introductory rate that later jumps above the utility's Standard Offer Service price, and that OPC has not seen variable rates go lower than the initial rate¹³ in its experience. A fixed plan that looks a half-cent higher than today's variable teaser can still cost less over 12 months if the variable product steps up after month three.
Fixed rates also "cost less" in a practical sense when bill predictability prevents late fees, high-interest borrowing, or missed payments. That is not a kilowatt-hour math trick; it is cash-flow math. If a $40 surprise bill forces expensive credit, the fixed plan's premium can pay for itself even when average cents per kWh look slightly higher.
When Variable Rates Can Cost Less — and When They Do Not
Variable rates can cost less when wholesale and retail market prices are falling, when you monitor the bill, and when you can leave without a penalty. Texas's Power to Choose site notes that because customers can switch anytime, companies have an incentive to keep variable rates competitive — but it also states plainly that those plans carry increased risk² if prices spike.
They can also fit customers who expect to move soon, who are waiting out a short gap before locking a fixed renewal, or who deliberately want wholesale-linked products and understand the formula. FTC staff have argued that preserving dynamic retail options can improve system efficiency when customers respond to price signals. That is a system benefit, not a guarantee that your household bill will shrink.
The failure mode is well documented. During the February 2021 freeze, Texas Attorney General Ken Paxton sued Griddy, alleging deceptive marketing and describing customers who were auto-debited hundreds or thousands of dollars per day¹⁴ when wholesale-linked prices surged. The Texas PUC's contemporaneous investigation focused on indexed retail plans tied to wholesale prices. Those episodes do not prove every variable product is unsafe. They do prove that "variable" is not one product: discretionary month-to-month rates, capped seasonal variables, time-of-use plans, and wholesale-indexed plans sit on very different points of the risk spectrum.
Maryland's consumer advocates put it bluntly: variable rates are very high risk⁸. Their shopping checklist tells consumers to ask whether a rate is fixed or variable, whether a low rate lasts only a few months, and whether there is any cap. If you cannot answer those questions from the contract — not from a salesperson's pitch — you are not ready to compare cost.
Ohio regulators add a quieter warning: after a contract ends, terms and rates can change⁷. The same is true in Texas and Pennsylvania, where expired fixed plans often roll to month-to-month pricing that may be higher. A variable product that looks fine today can become expensive by default if you stop watching.
The Fine Print That Changes the Math
Headline cents per kWh are incomplete.
Delivery charges stay with the wires company in choice markets. Maryland OPC notes that a $5 monthly fee¹³ can equal about another half-cent per kWh for an average customer. Always ask whether the advertised rate includes recurring fees.
Contract length and exit fees change the break-even. Texas's shopping checklist asks whether there is a penalty for breaking the contract¹⁵, what happens when the contract expires, and whether the quoted price at 1,000 kWh includes transmission, distribution, and monthly charges. Pennsylvania notes that long-term fixed contracts may have cancellation fees, while many variable contracts do not — but you must read your disclosure.
Introductory pricing is a comparison trap. OPC advises consumers not to assume retail suppliers will beat the utility Standard Offer over time, and to keep checking the bill against that benchmark. In Ohio, the starting point is the utility Price to Compare⁷ on your bill — the default generation rate — then the state's Apples to Apples charts for certified offers.
Incentives (gift cards, airline miles, "free" nights) can be worth less than a cleaner, slightly lower all-in rate. OPC says to weigh whether the incentive is worth possibly paying higher supply charges.
Prepaid and time-of-use products alter both cash timing and effective price. Texas warns that prepaid plans generally charge a higher rate than non-prepaid plans and can disconnect with little notice if the balance runs low. Time-of-use averages on shopping sites depend on assumed load shapes; if your peak usage lands in expensive hours, the "average" rate on the label understates your cost.
How to Compare Plans With Real Numbers
Use official shopping tools first, then do arithmetic with your usage.
Texas: Start at Power to Choose¹⁵. Ask your current retailer for your total rate at 1,000 kWh (excluding taxes and one-time fees). Compare fixed, variable, and indexed offers using the Electricity Facts Label. Confirm what happens at expiration — many plans default to a higher month-to-month price if you do nothing.
Ohio: Find the Price to Compare on your utility bill, then use Energy Choice Ohio's Apples to Apples¹⁶ charts. PUCO publishes the tool as a snapshot of certified offers that can change at any time; read the full terms before you enroll. PUCO's shopping guidance publishes each utility's Price to Compare⁷ for defined periods — for example, figures near 10.1 to 11.1 cents per kWh for several major utilities in one recent update — which underscores that the baseline itself moves and must be rechecked.
Maryland: Compare any supplier offer to your utility's Standard Offer Service⁸ price. Confirm the supplier is licensed, get the contract summary, and treat variable products as high risk unless the contract states a clear formula and any caps.
Pennsylvania: Use PAPowerSwitch⁴ definitions and shopping filters for fixed versus variable offers, and read the disclosure on renewal. An expired fixed rate can become a monthly variable rate if you take no action.
A simple comparison method works in every choice state:
- Pull 12 months of kWh usage (or estimate with seasonal highs).
- Compute all-in supply cost: (cents/kWh × kWh) + monthly fees − incentives amortized over the term.
- For fixed plans, add any early termination fee × probability you leave early.
- For variable plans, stress-test a bad month: what if the rate doubles for 30 days during a heat wave or freeze while usage also rises 20%?
- Compare the result to staying on the default / Price to Compare / Standard Offer path for the same usage.
If the variable plan only "wins" in the optimistic case and loses badly in the stress case, it is not cheaper for a risk-averse household — even if the expected value looks close.
A Practical Decision Framework for Households and Small Businesses
Choose fixed when you need predictable operating costs, you expect to stay put for most of the term, winter or summer extremes are common where you live, or you cannot monitor rates monthly. For many small businesses, payroll and rent already float; electricity is a good place to buy certainty.
Choose variable (non-indexed) only when you will watch the bill, you can switch quickly, exit fees would otherwise trap you, and the contract explains how the rate changes. Treat teaser rates as temporary by definition.
Avoid or approach wholesale-indexed products with extreme caution unless you fully understand the index, the caps (if any), billing frequency, and autopay settings. Texas's 2021 experience showed how quickly indexed exposure can overwhelm a household budget when the grid is stressed.
In regulated markets, ask your utility about time-of-use, seasonal, or budget-billing options rather than hunting for a competitive fixed/variable retail split you cannot access. Efficiency upgrades and thermostat schedules often save more than switching rhetoric does when you have no retail choice.
Revisit the choice at renewal, not just at move-in. Markets change; your usage changes; a plan that was cheapest in a mild year can be wrong for a stormy one. Set a calendar reminder 45 to 60 days before any fixed term ends so you are not rolled onto an expensive default rate by silence — a failure mode flagged in Texas, Ohio, and Pennsylvania consumer materials alike.
Wherever you live, the decision is not "Which slogan is cheaper?" It is "Who holds wholesale risk — you or the supplier — and what are you paying for that transfer?" Fixed rates usually cost a little more in calm markets because the supplier is selling insurance. Variable rates usually look cheaper up front because you are keeping the risk. Over a full year that includes a bad week, the insured path is often the one that costs less in cash you actually spend — and sleep you actually keep.