A company that sells electricity to customers. All Retail Electric Providers must be certified to do business by the Public Utility Commission of Texas. A REP is not mandated to a set energy price. The original purpose of the REP was to utilize competition to lower rates in Texas. The REP sends customers their bills. They do not service the electric lines or produce the power.
In essence, the Retail Electric Provider is, in fact, an Aggregator as the REP joins two or more parties into a single purchasing unit and negotiates with the Energy Producers for electricity. REPs do not generate, nor deliver electricity to their customers. However, the PUC has determined that an Aggregator is something different.