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TDU Delivery Charge: TDU stands for transmission and delivery utility — in other words, the utility company in your area that is actually piping the energy from the power generation companies into your home. (Remember, REPs in Texas are just the middleman.) The TDU delivery charge is set by the utility and is consistent from plan to plan and provider to provider within its service areas. For example, AEP , the TDU for Corpus Christi, charges the same delivery fee for all TXU, Direct Energy, and Reliant plans. You don't typically get a choice in utility company, and therefore, these fees are pretty much unavoidable, non-negotiable, and won't factor into choosing an electricity plan or provider.
Due to the increased usage of natural gas immediately after deregulation, new-era energy tools such as wind power and smart-grid technology were greatly aided. Texas' first "renewable portfolio standard" — or requirement that the state's utilities get a certain amount of their power from renewable energy like wind — was signed into law in 1999, as part of the same legislation that deregulated the electric market.
As you choose your energy plan, you might want to consider a variable-rate plan. The wholesale price for electricity changes constantly and a variable rate allows you to take advantage of its ups and downs. When prices are low, your electricity rate can drop to reflect the market change. On the other hand, electricity prices can rise, causing you to pay a higher rate.
Another option you could choose for your power plan is a fixed-rate option. This plan structure allows you to pay a flat electricity rate throughout your contract term, allowing for price security from volatile market conditions. You even have the right to choose an electricity provider that offers long-term plan options. Some retail providers will allow you to lock in a rate for up to five years, giving you longstanding protection against changing market rates.
The ability to make an electric power switch gives Texas energy consumers the freedom to shop and search for a new rate. Texans switch power providers for a number of reasons. You may choose to switch power supply providers because you move to a new utility area that your current retail provider doesn't service. Maybe you switch power providers because you're unhappy with your current provider's level of customer service. Maybe your reason for switching is simply to find a better rate than what you have now. Whatever your reason may be, you have the power to switch electricity providers.

In this free market competing electricity retailers buy electricity wholesale from private power generators to sell at retail to around 85% of Texas residents. The partnership between generators and retailers is governed by the Electric Reliability Council of Texas, or ERCOT, which attempts to balance the power grid’s electricity supply and demand by purchasing small amounts of electricity at 15-minute intervals throughout the day.
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