NEW YORK--(BUSINESS WIRE)--Fitch Ratings has affirmed the long-term Issuer Default Rating (IDR) of Tucson Electric Power Co. (TEP) at 'BBB' and revised the Rating Outlook to Positive from Stable. Fitch has also affirmed TEP's short-term IDR at 'F2'. A complete list of ratings appears at the end of this release. Approximately $1.5 billion of debt is affected by today's rating action. TEP's ratings and Positive Outlook reflects a constructive regulatory environment in Arizona, improving economic