Transmission and Delivery Charges: Bi-Annual Adjustment

 Historical look at the twice yearly adjustments made to TDU rates. Rates typically are raised in September and lowered in March.

Utilities adjust their transmission and delivery rates typically two times per year.  The rates increase in September and decrease in March.  The amount of these changes vary, as illustrated in the chart below.

Your energy rate will not change when the transmission and delivery rates change, but your average price per kWh will.  For example, Centerpoint customers will see an increase of about 1.4 cents per kWh to their average price per kWh paid, effective September 1, 2025, from the previous billing cycle. These changes will be applied to any current billing cycle that contains dates in September and will continue until the next adjustment in March 2026.  Please be aware:  September bills are often the most expensive bill of the year, due to higher summer usage coupled with the increase in TDU rates.  

To interpret the chart below, locate your utility.  The Consumption Charge is the rate that is multiplied by the number of kWh used that billing cycle.  The Monthly Base Charge is the meter fee that is charged each billing cycle.  It may or may not be itemized separately, depending on how your provider prepares their billing invoices.  The Approx. Adder is the estimate of how much you should add to your energy rate to have an idea of how much you might pay per kWh.  This is an estimate based upon 2000 kWh used and includes the Consumption Charge and Monthly Base Charge.  It does not include taxes and other fees.  This estimate could go up or down slightly depending on usage because of the averaging of the base charge.