Address verification comes before plan shopping
Think of a competitive Rosenberg account as two layers. The regulated delivery layer stays with CenterPoint Energy Houston Electric; the retail layer can be contracted with an eligible REP. The TDU handles meters and local grid work, while the REP controls the contract structure, energy price, renewable content and customer-facing plan terms.
That model applies only after the premise is matched to the correct territory. Use an ESI ID, a recent bill or an official service-area tool to verify the address. City limits alone are not a reliable substitute for a certified utility boundary.