The Electricity Facts Label (EFL) is the industry standard document that contains all the fine print about an electricity plan.  In it you will find all of the components that make up the electricity rate that is advertised for that plan.   You will find the rate you should expect to pay at 3 standard levels of monthly usage in Houston:  500kWh, 1000 kWh, and 2000 kWh hours.
Another unwelcome side effect of not knowing your average monthly kWh usage level is that you may end up paying more than you expect. This can occur when a customer inadvertently shops an electric rate based on a higher usage level than they actually use. Electricity suppliers commonly advertise their electric rates associated with the highest (2000 kWh) usage levels since those tend to be the lowest rates.
REPs sell electricity rates to Houston energy consumers, but transmission and distribution service providers (TDSPs) deliver the supply of electricity. In Houston, CenterPoint Energy serves as the area's TDSP and works with about 85 REPs. If your power goes out, immediately report the issue to CenterPoint Energy, not your REP. Use the following phone numbers to get in touch with your Houston TDSP.