SAN FRANCISCO (Standard&Poor's) March 11, 2008--Standard&Poor's Ratings Services said today that it raised its unsecured ratings for Tucson Electric Power Co. (TEP) by one notch to 'BB-' and assigned its 'BB-' rating to the proposed offering of up to $121 million of 2008 series A industrial development bonds issued by the Pima County Industrial Development Authority in Arizona (Pima). The Pima bonds will be unsecured obligations of TEP, which is the obligor. TEP will use the offering's proceeds to pay down its revolver balances of about $75 million as of March 7, 2007 and to prefinance a portion of TEP's $138 million maturity of collateral trust obligations, due August 2008. The outlook is stable. The upgrade