TDU Delivery Charges: What They Are and How They Affect Your Electricity Bill
Shopping for electricity in Texas often starts with a price in cents per kilowatt-hour. The first bill can still be a surprise. Alongside the charge for the electricity itself, there is another cost for getting that power through the local grid and into the home.
That second cost is the TDU delivery charge. It is a normal part of electric service in deregulated parts of Texas, not a duplicate energy charge. Still, it deserves attention when plans are compared because it can make up a sizable share of the final bill, especially during a hot summer month.
What Are TDU Delivery Charges?
TDU delivery charges pay for the local system that carries electricity to a home or business. The charge is separate from the supply price offered by a Retail Electric Provider (REP), although the two may appear together in the advertised average rate.
TDU Delivery Charge Definition
TDU stands for Transmission and Distribution Utility. The same companies are also called TDSPs, or Transmission and Distribution Service Providers. They maintain poles, wires, substations, transformers, and meters. When a line goes down, the TDU sends the repair crew.
The term TDSP delivery charges refers to the same regulated category. The REP has a different job. Companies such as Reliant, TXU Energy, and Gexa sell plans and issue customer bills in the competitive market. A customer can change REPs but cannot select a different TDU. The utility territory is tied to the service address.
TDU rates are approved by the Public Utility Commission of Texas. The utility bills the REP for delivery, and the REP collects that cost from the customer. Bills do not all display it in the same way. Some show a separate delivery line, while some plans incorporate the charge into their pricing structure.
How TDU Charges Are Calculated
Residential delivery charges usually have a fixed component and a usage-based component:
Total TDU charge = monthly fixed charge + (monthly grid usage in kWh × delivery rate per kWh)
The fixed amount is due even in a low-use month. The second part changes with the meter reading. If a household uses twice as much grid electricity in August as it did in April, the usage-based portion of its delivery charge will roughly double.
TDU rates can change when new rates or tariff riders take effect. Exact charges depend on the utility territory and billing period. The latest EFL and bill are better references than an old online rate chart.
What Is Included in TDU Delivery Charges?
The delivery line is not payment for one single service. It combines the approved costs of operating the local distribution system, metering electricity, and moving power across the transmission network. The exact mix depends on the utility tariff.
Fixed Monthly Delivery Charges
A home can sit empty for most of the month and still receive a fixed TDU charge. That fee supports customer and metering functions that exist regardless of how many kilowatt-hours pass through the meter.
This fixed-plus-variable structure helps explain how electricity delivery charges are calculated. The bill may also label this regulated amount as a delivery fee.
Usage-Based Delivery Charges
Most of the delivery cost for a high-use household comes from the per-kWh rate. Every kilowatt-hour imported from the grid is multiplied by the applicable delivery rate. Air-conditioning use therefore affects more than the REP energy charge. It also raises the variable TDU amount, which can make solar panels useful for reducing the amount of electricity drawn from the grid.
This is why two plans with similar supply prices can produce different-looking bills when they are marketed in different TDU areas. The electricity product may be the same, but the regulated delivery tariff is not.
Metering and Distribution Charges
The local utility is responsible for the meter and the equipment between the broader grid and the property. Many Texas smart meters record usage in short intervals, commonly 15 minutes, which supports remote readings and detailed usage histories.
Distribution charges also help pay for neighborhood lines, transformers, substations, vegetation work, and restoration after an outage. A customer pays the REP, but the crew replacing a damaged pole works for the TDU.
Transmission and Other Regulated Charges
Power generated in West Texas, along the Gulf Coast, or elsewhere in ERCOT must travel across high-voltage lines before it reaches a neighborhood system. TDU delivery charges may therefore reflect transmission and distribution costs as well as applicable tariff riders and other regulated charges.
Not every component appears as its own line on a residential bill. In many cases, customers see one combined TDU delivery amount.
How Do TDU Delivery Charges Affect Your Electricity Bill?
The effect is easiest to see in a simple example. The following table assumes a 9-cent REP energy charge, a 6-cent usage-based delivery charge, and a $4 monthly TDU fee. It is an illustration, not a current quote for any particular utility.
How High Usage Increases TDU Charges
| Monthly Grid Consumption | Supply Charge (@ 9¢/kWh) | Est. TDU Delivery Fee (@ 6¢/kWh + $4.00 base) | Total Bill | Delivery % of Bill |
|---|---|---|---|---|
| 500 kWh (Mild spring) | $45.00 | $34.00 | $79.00 | 43.0% |
| 1,200 kWh (Early summer) | $108.00 | $76.00 | $184.00 | 41.3% |
| 2,500 kWh (Peak August heat) | $225.00 | $154.00 | $379.00 | 40.6% |
The delivery percentage becomes slightly smaller as usage rises in this example because the fixed fee is spread across more kilowatt-hours. The dollar amount does not shrink. It climbs from $34 to $154 as grid consumption increases.
For a Texas household, that distinction matters more than the percentage. A long run of triple-digit afternoons can raise the energy charge and the delivery charge on the same bill.
A home battery paired with on-site solar can help reduce grid imports and, in turn, the usage-based portion of TDU charges.
TDU Charges vs. REP Energy Charges
The two charges pay different companies for different parts of electric service:
REP Energy Charge: The competitive price for electricity under the selected plan. The REP also sets contract terms, bill credits, base charges, and time-of-use rules.
TDU Delivery Charge: The regulated cost of delivering and metering electricity in the utility territory. The customer cannot negotiate this tariff or avoid it by switching to another REP.
The advertised average price on an Electricity Facts Label must account for TDU delivery charges. That does not mean every plan presents them identically on the monthly bill. Read the pricing formula rather than comparing one bold cents-per-kWh figure.
How Much Are TDU Delivery Charges in Texas?
Texas does not have one statewide residential TDU rate. Each utility has its own PUCT-approved tariff, and the applicable utility depends on the address. The figures below are approximate residential charges published for early September 2026. They can change with later tariff and rider updates.
| Utility (TDU / TDSP) | Primary Service Region | Monthly Fixed Charge | Volumetric Rate (per kWh) |
|---|---|---|---|
| Oncor Electric Delivery | Dallas–Fort Worth, North Texas, Midland | $4.06 | 6.0295¢ |
| CenterPoint Energy | Greater Houston Metro | $4.90 | 6.4130¢ |
| AEP Texas Central | Corpus Christi, Rio Grande Valley, Victoria | $3.24 | 5.7554¢ |
| AEP Texas North | Abilene, San Angelo, Vernon | $3.24 | 5.6407¢ |
| Texas-New Mexico Power (TNMP) | Gulf Coast, Lewisville, Fort Stockton | $7.85 | 7.4022¢ |
Source: Public Utility Commission of Texas (PUCT), residential TDU rates as of September 1, 2026. Rates may change with later tariff or rider updates, so always verify current delivery charges on your latest bill or Electricity Facts Label (EFL).
Oncor Delivery Rates
Oncor covers Dallas–Fort Worth and a large stretch of North and West Texas. At a delivery rate of about 6.03 cents per kWh, a home using 1,500 kWh would pay about $90.44 in usage-based delivery costs before the fixed charge is added. The exact amount depends on the tariff in effect for that billing period.
CenterPoint Delivery Rates
CenterPoint serves Houston and much of the surrounding area. Its fixed charge and per-kWh rate are separate from whatever energy plan a customer buys from a REP. Houston customers should pay particular attention to the effective date on any rate comparison because approved riders can change during an existing retail contract.
AEP Texas Delivery Rates
AEP Texas operates Central and North divisions across South and West Texas. The two divisions carry different per-kWh delivery rates, even though the fixed residential charges are the same as of September 2026. Use the division named on the bill or EFL rather than assuming that one AEP Texas figure applies across the entire service area.
Texas-New Mexico Power Rates
TNMP serves a collection of noncontiguous areas along the Gulf Coast and in North Central and West Texas. Its fixed residential charge is higher than those of the other major TDUs listed above as of September 2026, and its usage-based charge is also the highest in the group. That makes the delivery component especially noticeable in a low-use apartment or a high-use summer home.
How Can You Lower the Impact of TDU Charges?
The tariff itself is not negotiable. Savings come from using fewer kilowatt-hours from the grid, selecting a retail plan that fits the home’s actual usage pattern, and understanding practical ways to lower your Texas electricity bill, while understanding which charges remain even when the REP advertises discounted electricity.
Reduce Overall Electricity Consumption
Air conditioning is the obvious target in a Texas summer, but it is not the only one. A poorly sealed attic hatch, a dirty HVAC filter, an aging pool-pump schedule, or an electric water heater can quietly add to usage every day. Each avoided grid kilowatt-hour reduces the usage counted toward the variable TDU charge. The effect on the REP portion depends on the plan.
Solar changes the calculation only when it reduces electricity imported through the meter. The EcoFlow DELTA Pro Ultra X can store solar energy for later household use, allowing selected loads to draw from stored power instead of the grid. That may reduce the usage-based delivery charge. The fixed monthly TDU fee remains, and actual savings depend on the home’s solar production, consumption pattern, retail plan, and interconnection arrangement.
Manage High-Load Usage With TOU (And the "Free Nights" Catch)
Time-of-use plans can reduce the REP portion of an electricity bill by rewarding customers for shifting consumption away from expensive periods. However, simply moving grid consumption from one time of day to another does not generally reduce a standard per-kWh TDU delivery charge. The EcoFlow DELTA Pro Ultra + Smart Home Panel 2 can help manage when household loads use stored energy. This may be useful for major appliances that would otherwise run during a costly peak window.
The phrase “free nights” needs a closer read. A plan may reduce the REP energy charge to zero during certain hours while continuing to assess the normal TDU delivery charge on every kilowatt-hour drawn from the grid. Charging a battery overnight could therefore carry a delivery cost even when the retail energy portion is free.
Solar charging can reduce that grid draw. Some plans bundle or credit delivery costs differently, so the EFL and Terms of Service control.
Check TDU Charges on Your EFL
The Electricity Facts Label is more useful than the large promotional rate at the top of a shopping page. It shows average prices at standard usage levels and lays out the formula behind them. Read it next to the home’s recent bills, not in isolation.
Look for “TDU Delivery Charges Included”: TDU charges must be reflected in the EFL’s average prices, but the pricing section explains whether they are bundled into the energy rate or passed through as a separate line.
Watch for Bill Credit Traps: A usage credit can make the 1,000-kWh example look attractive while producing a much higher effective price at 900 or 1,200 kWh. Check the exact threshold or usage band and compare it with a full year of household consumption.
Verify Fixed REP Base Fees: The REP may charge its own monthly fee in addition to the TDU’s fixed charges. Include both when comparing plans.
Conclusion
TDU delivery charges are an unavoidable part of electric service in deregulated Texas markets. The applicable charges are based on the PUCT-approved TDU tariff for the service area and customer class.
The practical way to manage the cost is to compare plans using their full EFL formulas, not their headline rates. Lower grid consumption can reduce the usage-based portion of the delivery charge. Solar and battery storage may help by increasing the amount of on-site energy used at home, but the fixed TDU charge remains on the bill.
FAQ
Why Are Delivery Charges So High on My Electric Bill?
Delivery charges represent the actual cost of maintaining the physical electrical grid, including transformers, poles, wires, and storm restoration crews across Texas. Because these fees include a variable per-kWh rate, your total delivery cost climbs substantially during summer months when your household energy consumption rises.
Why Did My TDU Delivery Charge Go Up?
Your TDU charge may increase because your household used more electricity or because the applicable utility rates or riders changed. TDU rates are regulated by the PUCT and can be updated over time.
Why Is My Electric Delivery Charge Higher Than My Usage?
Your delivery charge can exceed your energy supply charge if you locked in a very low promotional supply rate with your retail provider or if you used very little overall energy. Because TDUs charge a mandatory monthly base fee regardless of usage, low-consumption homes often see delivery fees that eclipse their supply cost.
Do TDU Charges Change?
Yes, TDU delivery charges can change periodically as PUCT-approved rates and riders are updated. Check the latest PUCT rate information or your EFL for current charges.
Does Every Electric Company Charge a Delivery Fee?
Yes. In deregulated Texas service areas, the applicable TDU delivery charges are reflected in the customer’s electricity pricing and bill. Regardless of which REP sells the electricity, the underlying TDU charges are based on the regulated tariff for the service area and customer class.
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