NEW YORK (Standard&Poor's) June 18, 2010--Standard&Poor's Ratings Services has raised its rating on Tacoma, Wash.'s electric system revenue bonds outstanding to 'AA' from 'AA-'. At the same time, Standard&Poor's assigned its 'AA' rating to Tacoma's series 2010A, 2010B, and 2010C electric system revenue bonds. The outlook is stable. "The upgrade reflects our opinion of Tacoma's sustained strong financial condition," said Standard&Poor's credit analyst Peter Murphy. Fixed charged coverage at 1.6x or higher during fiscals 2006-2009, and unrestricted cash and investments of more than 300 days' cash on hand in the past two years are very strong metrics, in our view. "The rating reflects our view of the utility's favorable power supply position,