How TDU Delivery Charges Work (and Why They're Not Optional)

Last updated: September 8, 2026

WattKicker

How TDU Delivery Charges Work (and Why They’re Not Optional)

You found a plan advertising a great rate. You signed up. Then the bill came, and a chunk of it is a line item you never agreed to with a company you never chose. That’s your TDU delivery charge, and no Texas electricity plan — no matter how cheap the advertised rate — makes it go away.

What a TDU actually is

Texas’s deregulated electricity market splits two things that used to be bundled into one utility: who generates and sells you the electricity, and who physically delivers it. The delivery half — the poles, wires, transformers, and the meter at your house — is handled by a Transmission and Distribution Utility, or TDU (sometimes called a TDSP). Depending on where you live, that’s a company like Oncor, CenterPoint Energy, AEP Texas, or TNMP.

You don’t pick your TDU. It’s assigned by your physical address, and it operates as a regulated monopoly in its territory — the same setup as before deregulation, because it doesn’t make sense to run five competing sets of power lines down one street. What you do get to choose is your retail electricity provider (REP), the company that sells you the energy itself and competes for your business on price and plan structure.

Your bill combines both: an energy charge set by your retail provider, and a delivery charge set by the TDU and approved by the Public Utility Commission of Texas (PUCT).

Why it’s not optional, and why it doesn’t change with your plan

A few things make the TDU charge different from everything else on your bill:

It’s identical across every plan and provider in your area. Because the PUCT sets the rate and it applies to the whole service territory, switching retail providers doesn’t change your delivery charge at all — only your energy rate. Retail providers are required to pass the TDU charge through at cost; they’re not permitted to mark it up for profit.

It has two parts. Most TDU charges combine a fixed monthly customer charge with a per-kWh delivery rate, so the total scales up with how much electricity you use, similar to the energy charge itself. The exact fixed amount and per-kWh rate vary by TDU — check your own bill or your utility’s published tariff for the current numbers, since this guide won’t quote figures that could already be out of date by the time you read it.

It updates on a schedule, not when you switch. TDU rates are typically revised roughly twice a year through a regulatory filing process, which means your delivery charge can shift even if you never touch your contract. If your bill changed and you didn’t switch plans or providers, this is one of the first places to look.

It’s a real share of your total bill. Delivery charges commonly account for a meaningful portion of a typical Texas electric bill — often cited in the range of a third or so — which is exactly why comparing plans on the advertised energy rate alone can be misleading. Two plans with very different advertised rates can land close to the same total once you add in a TDU charge that’s the same for both.

What this means when you’re comparing plans

The practical takeaway is simple: your TDU charge is a fixed cost of living at your address, not a variable you can shop for. When you’re comparing electricity plans, the number that matters is the all-in cost at your actual usage level — energy charge plus TDU delivery charge plus any other fees — not just the advertised per-kWh energy rate on its own.

This is also why your Electricity Facts Label (EFL) is worth reading past the headline rate. A reputable EFL will show the total average price per kWh at a few usage levels, which bakes in the TDU charge already. If a plan’s marketing rate looks unusually low, it’s worth checking whether that number is the energy rate alone or the true all-in price.

It’s also worth remembering when your bill jumps for reasons that don’t seem to line up with your plan. A TDU rate adjustment, not a change in your contract, is a common — and often overlooked — explanation.

Comparing plans and tracking your actual bill against what you signed up for is exactly the gap WattKicker is built to close — it pulls your real usage data and shows you the full picture, delivery charges included, instead of just the advertised rate.

Your TDU is the one part of your electric bill you’ll never get to negotiate. Everything else — your provider, your plan structure, your rate — you can. Knowing which is which makes it a lot easier to tell whether a bill change is something you caused, or something that happened to everyone on your street at once.