Standard&Poor's Ratings Services confirmed its 'A-1' rating on Houston's series 2009B-3 combined utility system commercial paper notes, due to the bank facility being extended to Jan. 16, 2018. The rating is based on the short-term rating on the letter of credit provider, Bank of Tokyo-Mitsubishi UFJ Ltd. Criteria: Methodology And Assumptions: Approach To Evaluating Letter Of Credit-Supported Debt, July 6, 2009