Last Updated on April 7, 2021 by Mary Pressler
Understanding TDU Charges
If you compare electricity rates in Texas, you will notice differences from city to city. Texas has a deregulated power sector, and you can choose your electricity provider – the company who supplies the kilowatt-hours. However, that energy must be delivered from power plants to consumers, and specific companies are in charge of the power grid in each region.
- These companies are called transmission and distribution utilities (TDU), and they charge for delivery of electricity.
- Even if you find identical electricity plans in different parts of Texas, the final kWh price may change because of TDU charges.
The main TDUs in Texas are CenterPoint Energy, Oncor Electric Delivery, American Electric Power (AEP) Central, AEP North, and Texas-New Mexico Power (TNMP). TDU delivery charges are reviewed twice per year by the Public Utility Commission of Texas, on March 1 and September 1.
How Much Do Texas Utilities Charge to Deliver Electricity?
The following table summarizes the latest TDU charges published by the PUCT (March 1, 2020). These rates include the COVID-19 Electricity Relief Program from April 1, which adds $0.00033/kWh for all utility companies.
|Utility Company||Fixed Charge ($)||TDU Charges ($/kWh)|
|Oncor||$3.42||$0.035601 / kWh|
|CenterPoint||$5.47||$0.034815 / kWh|
|AEP Central||$4.79||$0.042616 / kWh|
|AEP North||$4.79||$0.036135 / kWh|
|TNMP||$7.85||$0.041524 / kWh|
Assume you are comparing power bills for five homes, with a consumption of 1,000 kWh per month and a fixed rate of 7.5 cents/kWh. However, final kWh prices will vary if each home is served by a different utility company.
|TDU in the Service Territory||Cost of 1000 kWh at 7.5 cents / kWh||Cost of 1000 kWh after TDU Charges||Average kWh Price|
|Oncor||$40||$114.02||$0.1140 / kWh|
|CenterPoint||$40||$115.29||$0.1153 / kWh|
|AEP Central||$40||$122.41||$0.1224 / kWh|
|AEP North||$40||$115.93||$0.1159 / kWh|
|TNMP||$40||$124.37||$0.1244 / kWh|
In this example, the TNMP customer pays 9% more than the Oncor customer, even when all homes have a fixed rate of $0.075 per kWh.
The availability of electricity plans in your city can also affect kWh prices. However, when you compare identical electricity plans in different regions of Texas, the power bill differences can be explained by transmission and distribution charges. You can choose freely among the Retail Electricity Providers (REP) where you live, but you cannot switch your TDU unless you change your residence. For example, if you move from Houston to Dallas, your utility company will change from CenterPoint to Oncor.
|TDU in the
|Avg. kWh price at
|Avg. kWh price at
|Avg. kWh price at
|Oncor||11.76 cents||10.74 cents||10.25 cents|
|CenterPoint||12.34 cents||11.25 cents||10.72 cents|
|AEP Central||14.01 cents||12.49 cents||11.73 cents|
|AEP North||13.63 cents||12.23 cents||11.54 cents|
|TNMP||14.07 cents||12.53 cents||11.76 cents|
The effect of TDU charges can be observed here: AEP Central and TNMP both have TDU charges above 4.1 cents/kWh, and the final kWh price in their territories is also higher. On the other hand, Oncor has the lowest monthly fee ($3.42) and the second-lowest kWh charge (3.5601 cents/kWh), and this helps achieve the lowest kWh prices on average.
Retail electricity providers can compete with each other because they use the same power lines, poles and transformers. If you switch your electricity plan, you will continue using the same power meter and grid connection. However, competition between TDUs would require a separate grid for each company, which would be impractical and a waste of money – imagine having five times more power lines and utility poles in your city!