Tucson Electric Power Co. plans to enter into a $250 million senior unsecured revolving credit facility. We are assigning a 'BBB+' issue-level rating to the proposed facility. At the same time, we are affirming our ratings on Tucson Electric Power Co., including the 'BBB+' issuer credit rating and 'BBB+' rating on its existing senior unsecured debt. The stable outlook reflects our expectation that Tucson Electric Power Co. will maintain financial measures that are consistent with the middle of the range for a "significant" financial risk profile. On Sept. 24, 2015, Standard&Poor's Ratings Services assigned its 'BBB+' issue-level rating to Tucson Electric Power Co.'s (TEP) proposed $250 million senior unsecured revolving credit facility. At the same time, we affirmed