The largest Retail Electricity Provider (REP) brand in Texas is Reliant Energy, with 1,545,510 residential customers. The second largest retail electricity provider brand in Texas is TXU Energy, with 1,442,516 residential customers.
Five parent corporations (NRG Energy, Vistra Corp., Just Energy Group, NextEra Energy Inc. and Constellation Energy Corporation) control 90% of the Texas residential electricity customer base.
Data Source: All retail electricity providers in Texas must file their customer counts by type of customer with the Energy Information Administration. We’ve extracted and analyzed data from the EIA 2025 Annual Electric Power Industry Report released October 7, 2026, and appended their parent corporation.
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