NEW YORK (Standard&Poor's) May 21, 2010--Standard&Poor's Ratings Services has assigned its 'A+' long-term rating to Austin, Texas' electric utility system revenue refunding bonds series 2010A and 2010B. At the same time, Standard&Poor's affirmed its 'A+' underlying rating (SPUR) on the city's separate lien electric utility system revenue bonds, and its 'AA' SPUR on the city's first-lien combined utility revenue bonds. The outlook is positive. "The ratings reflect our view of the general creditworthiness of the system, which includes its diversified generation resource mix, competitive rates, strong liquidity, and a service area that is not concentrated in revenues from its principal customers," said Standard&Poor's credit analyst Peter Murphy. Austin officials plan to issue