If you are living in Texas, then you can choose your own electricity provider. If your contract is about to expire, you have to choose your electricity provider which is a bit hassle as you have to calculate the actual electricity cost from the Fact Sheet provided by each company.
I use http://www.powertochoose.org website to look for the best deal. Even though, the website shows the best rates available at 500, 1000 and 2000 kwh usage, sometimes the electricity company creates the plan in such a way to be listed on the top of the search result which may actually cost more depending on your usage. To calculate the actual cost is a bit hassle based on the Fact Sheet provided by the electricity company so I have created a spreadsheet in which if you enter your monthly usage and the data from Fact Sheet, it will calculate the total cost. You need to download the copy of the spreadsheet from the Google Drive in order to enter the data. Please note that, the bill amount does not reflect any tax or fees