Time-of-Use Electricity Plans in Texas: How They Work
A Time-of-Use (TOU) electricity plan charges different rates depending on the hour of day, usually with the lowest rates overnight and the highest rates in the late afternoon and evening. TOU plans can lower a bill for households that shift usage into off-peak hours — such as EV or battery charging — but can raise a bill for households whose usage stays concentrated during on-peak hours.
AI Energy Plans · Published August 15, 2026 · Reviewed for accuracy
Key Takeaways
- TOU plans split the day into rate periods — usually off-peak, mid-peak, and on-peak — instead of charging one flat rate.
- Savings depend on when a household uses electricity, not just how much it uses.
- Households with EVs, batteries, or flexible schedules (laundry, dishwashing, charging overnight) tend to benefit most.
- Texas has no single statewide TOU schedule — each retail electricity provider (REP) sets its own peak and off-peak windows.
- A TOU plan paired with a home battery can extend savings through energy arbitrage — charging off-peak, using stored power on-peak.
What Is a Time-of-Use Electricity Plan?
TOU pricing exists because the cost of generating and delivering electricity is not the same at every hour. Demand on the ERCOT grid rises sharply in the late afternoon and early evening, particularly during Texas summers when home cooling load peaks alongside the setting sun and declining solar output. Retail electricity providers use TOU rate structures to pass some of that time-based cost variation on to customers, and to reward usage patterns that don't add to peak strain on the grid.
How TOU Rate Periods Work in ERCOT
Most TOU plans fall into one of a few common structures:
Two-Period (Peak / Off-Peak)
A single on-peak window, often mid-afternoon to late evening, and a single off-peak rate for all other hours. This is the simplest and most common TOU structure offered by Texas REPs.
Three-Period (Off-Peak / Mid-Peak / On-Peak)
Adds a mid-peak 'shoulder' rate in the morning or early afternoon, giving a more gradual price ramp into the evening on-peak window.
Free Nights or Free Weekends
An aggressive variant of TOU pricing where a defined overnight or weekend window is billed at no per-kWh charge, offset by a higher rate during the remaining hours.
Weekday / Weekend Split
Applies on-peak rates only on weekdays, when ERCOT demand is typically highest, with flat or reduced pricing on weekends regardless of hour.
TOU vs. Fixed-Rate vs. Free-Nights Plans
Fixed-Rate
One rate at all hours
Predictable, steady usage; risk-averse households
No reward for off-peak usage
Time-of-Use (2–3 period)
Lower off-peak, higher on-peak
Households that can shift some usage overnight, EV owners, battery owners
Can cost more if usage is peak-heavy
Free Nights / Weekends
$0/kWh in a defined window, higher rate elsewhere
Night-shift schedules, EV charging, battery arbitrage
Daytime usage can be priced well above market average
Indexed / Variable
Rate tracks wholesale market in real time
Highly flexible households comfortable with volatility
Exposure to ERCOT price spikes
Who Benefits Most from a TOU Plan?
Good candidates for a TOU plan generally include:
- Households charging an electric vehicle overnight
- Households with a home battery that can charge off-peak and discharge on-peak (see battery energy arbitrage)
- Households that can run major appliances on a delay or timer
- Night-shift workers or households with schedules skewed away from evening hours
“A TOU plan is a bet on when a household uses electricity, not just how much. Two households with identical monthly usage can see opposite results on the same TOU plan, depending entirely on their hourly usage pattern.”
Pairing a TOU Plan with a Home Battery
For a full breakdown of how batteries are sized, priced, and dispatched for this purpose, see Home Battery Storage and Battery Energy Arbitrage.
A note on savings claims: Any modeled savings from switching to a TOU plan depend on a household's specific hourly usage pattern, the exact rate periods and prices of the plan being compared, and the accuracy of historical usage data. AI Energy Plans presents modeled projections, not guarantees — see our methodology for the assumptions behind every estimate.
Common TOU Pitfalls
Comparing the advertised rate, not the effective rate
A low headline off-peak rate can mask a high on-peak rate. What matters is the effective rate a specific household would pay across its actual hourly usage — not the lowest number on the Electricity Facts Label (EFL).
Ignoring TDU delivery charges
TOU plans affect the energy charge portion of a bill. TDU (transmission and distribution utility) delivery charges are typically separate and don't change based on time of use, but they still affect the total bill.
Assuming every TOU plan defines peak hours the same way
Peak windows vary by provider and by plan. A household should check the specific EFL for the plan being considered, not assume it matches a plan they've seen before.
Frequently Asked Questions
Related Pages
Electricity Plans
Compare all Texas electricity plan types in one place.
Compare Electricity Plans
Side-by-side plan comparison tool and guidance.
Home Battery Storage
Costs, sizing, and backup power basics.
Battery Energy Arbitrage
Using TOU rates to charge low and discharge high.
Methodology
How AI Energy Plans models rates, usage, and savings.
Glossary
TOU, TDU, EFL and other key terms defined.
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