Start with the utility territory, not the city label
The local electricity relationship in Amarillo centers on Xcel Energy / Southwestern Public Service Company. That means a generic Texas comparison site should not imply that every resident can replace the utility with a competitive REP. The useful first step is to confirm that Xcel Energy / Southwestern Public Service Company serves the exact meter and then read the current local rate schedule, customer-service rules and any available program options.
Wholesale-market participation does not automatically create retail choice. A municipal utility, cooperative or regulated investor-owned utility can buy or schedule power in a broader market while still remaining the retail service provider for its customers. For Amarillo, the service-territory assignment is therefore more important than a statewide list of provider brands.