What an Indexed Plan Actually Is
An indexed electricity plan, sometimes called a wholesale rate or real-time pricing plan, sets your energy charge based on a floating market price rather than a locked rate. In Texas, that market is ERCOT, the Electric Reliability Council of Texas, which clears electricity prices every five minutes. When grid supply is plentiful and demand is low, the real-time price can fall below 2 cents per kilowatt-hour. When the grid is stressed, prices can climb into dollars per kilowatt-hour, hundreds of times that calm-day level. PUCT's scarcity pricing rule (16 TAC §25.509) sets the high system-wide offer cap at $5,000 per MWh ($5 per kilowatt-hour) after regulators lowered it from $9,000 per MWh following Winter Storm Uri, and since ERCOT's RTC+B market redesign went live on December 5, 2025, offers have been capped at $5,000 per MWh in the day-ahead market and $2,000 per MWh ($2 per kilowatt-hour) in real time. Locational prices can still exceed those offer caps during extreme congestion.
Retail providers that offer indexed plans pass some version of that floating cost to you, sometimes at a one-hour average, sometimes at a daily average, sometimes with a small markup or administrative fee layered on top. Since 2021, however, Texas Utilities Code §39.110 (added by House Bill 16 after Winter Storm Uri) has barred a retail electric provider, broker, or aggregator from offering a wholesale indexed product, defined as one whose price includes a direct pass-through of ERCOT real-time settlement point prices, to a residential or small commercial customer; other customers may be enrolled only after signing an acknowledgment of the price risk. The structure varies by provider and plan, so reading the Electricity Facts Label before enrolling is not optional. It is the only document that defines exactly how your bill is calculated.
How Pricing Actually Gets to Your Bill
Most indexed plans in Texas work in one of two ways.
The first is a direct hourly pass-through. Your meter records how much electricity you consumed in each settlement interval, and that consumption is multiplied by whatever ERCOT's real-time price was at that moment. Bills are settled monthly, so you see the aggregate, not a per-hour ledger (though some providers offer apps that display granular data).
The second is a daily or monthly average pass-through. The provider takes the average real-time price across all hours in a day or month and applies that rate to your total consumption. This smooths out single-hour spikes but does not eliminate the risk of sustained high-price periods.
In both cases, the provider typically adds a fixed administrative or distribution charge, plus the standard TDSP (Transmission and Distribution Service Provider) pass-through fees that appear on every Texas electricity bill regardless of plan type. Those TDSP charges are regulated and set by the utility serving your area. They are not negotiable and do not change based on market conditions.
The Winter Storm Uri Lesson
No discussion of indexed electricity plans in Texas is complete without February 2021. Winter Storm Uri caused a sustained ERCOT grid emergency that lasted roughly four days. During that period, the real-time settlement price hit the PUCT-imposed cap of $9 per kilowatt-hour and held there for extended periods.
Households enrolled in direct pass-through indexed plans received bills in the thousands of dollars for a single week. One widely reported case involved a Dallas-area customer on a Griddy plan (Griddy was a retail provider offering direct wholesale pass-through) who received a bill exceeding $16,000 for the month of February 2021. ERCOT revoked Griddy's right to conduct activity in the market on February 26, 2021 after a payment breach and transitioned its customers to other providers; Griddy filed for Chapter 11 bankruptcy on March 15, 2021.
That outcome was extreme, but it was not a statistical anomaly. It was the predictable result of a plan structure that removed the price ceiling households normally receive through a fixed-rate contract, combined with a supply failure that ERCOT had not fully prepared for.
PUCT and the Texas Legislature took steps after Uri to improve grid weatherization requirements under Senate Bill 3, passed in 2021. Those requirements have improved cold-weather preparedness at some generation assets, but they do not eliminate the risk of price spikes during demand surges. ERCOT's own planning documents continue to identify tight reserve margins as a concern during extreme weather events.
Who Bears the Risk, and Who Might Benefit
Indexed plans are not inherently predatory. They are a legitimate product that transfers market risk from the provider to the consumer, in exchange for the opportunity to pay below-market rates during low-demand periods.
The consumer who benefits from an indexed plan tends to have three characteristics. First, they have flexible demand. They can shift dishwasher cycles, EV charging, and laundry to off-peak hours (typically late night and early morning) when real-time prices are lowest. Second, they have financial resilience. A month where the bill runs two or three times the typical amount should not create a hardship. Third, they actively monitor prices. Several free tools, including ERCOT's own public dashboard, display real-time and day-ahead prices so a household can make informed consumption decisions.
The consumer who faces meaningful danger from an indexed plan is one who cannot shift demand, has limited savings buffer, or simply does not have the bandwidth to track market prices alongside everything else in daily life. For that household (which describes the majority of Texas residential customers) a fixed-rate plan provides the predictability that makes budgeting possible.
What the Current Market Shows
For context on what the fixed-rate alternative looks like: as of September 9, 2026, plans listed on Choose My Power show a median all-in rate of 15.0 cents per kilowatt-hour at 1,000 kWh of monthly usage, across 120 live plans from 17 providers. The lowest-cost listed plan sits at 6.6 cents per kilowatt-hour all-in at 1,000 kWh (APGE, SimpleSaver 10, lowest-cost utility area). Both of those are fixed-rate products.
Indexed plan rates on a calm, low-demand day will often undercut those figures significantly. The question is not whether indexed plans can save money. They can. The question is whether the household can absorb the months when they do not.
What to Check Before Enrolling in an Indexed Plan
If an indexed plan is under consideration, four things merit careful review before signing.
First, find the price cap, if any. Some providers place a contractual ceiling on the rate they will charge even if the market exceeds it. Others do not. PUCT's disclosure rule (16 TAC §25.475) requires the Electricity Facts Label to state specifically whether a product is a fixed rate or a variable price product and to disclose how a variable price is determined, so the EFL and the terms of service document are where a ceiling (or the absence of one) should appear. If neither document states a cap, ask the provider to confirm in writing. A plan without a cap is a plan with theoretically unlimited exposure.
Second, understand the averaging method. An hourly pass-through and a monthly average pass-through behave very differently during a multi-day grid event. Know which one applies.
Third, confirm the cancellation terms. Some indexed plans are month-to-month with no early termination fee, which means exiting before a storm season is an option. Others carry fees that reduce that flexibility.
Fourth, ask whether the provider offers real-time price alerts. A provider that sends a text message when prices cross a threshold gives households a practical tool to curtail usage before a high-price hour runs long.
When Not to Switch to an Indexed Plan
There are specific circumstances where avoiding an indexed plan is the more defensible choice.
If the household includes members who require powered medical equipment, the financial risk of a price spike overlaps with a health risk. Stable billing matters more in that situation.
If the household is entering the summer peak season or approaching a winter with elevated demand forecasts, taking on market exposure at that moment adds risk without adding information. Waiting for a lower-volatility period to evaluate the product is reasonable.
If the household has no history with the ERCOT market and no existing habits around demand shifting, enrolling in an indexed plan as a first move into the deregulated market is premature. Starting with a fixed-rate plan, learning the billing structure, and evaluating indexed options after a year of data is a lower-risk path.
The Bottom Line
Indexed electricity plans in Texas are a real product with a real use case. They reward households that have the flexibility, financial cushion, and engagement to treat electricity pricing as something they actively manage. For households that cannot meet those conditions, the fixed-rate market provides dozens of competitive options without the tail risk that Winter Storm Uri made permanent in the Texas electricity conversation.