Debt and Credit Facilities	9 Months Ended
Debt and Credit Facilities	Sep. 30, 2011
Debt and Credit Facilities [Abstract]
DEBT AND CREDIT FACILITIES	NOTE 4. DEBT AND CREDIT FACILITIES We have summarized below the significant changes to our debt from those reported in our 2010 Annual Report on Form 10-K. There have been no significant changes to our outstanding letters of credit. UNISOURCE ENERGY CREDIT AGREEMENT UniSource Energy had $71 million in borrowings outstanding as of September 30, 2011 and $27 million in borrowings outstanding as of December 31, 2010, under its revolving credit facility. The revolving loan balances are included in Long-Term Debt in the balance sheet. TEP DEBT TEP had $5 million in borrowings outstanding under the TEP Credit Agreement as of September 30, 2011. TEP had no borrowings outstanding under the TEP Credit Agreement as of December 31, 2010. The revolving loan balances are included in Current Liabilities in the balance sheets. UNS ELECTRIC TERM LOAN CREDIT AGREEMENT In August 2011, UNS Electric entered into a four-year $30 million variable rate term loan credit agreement. UNS Electric used the $30 million in proceeds to repay borrowings under its revolving credit facility. The interest rate currently in effect is three-month LIBOR plus 1.25%. At the same time, UNS Electric entered into a fixed-for-floating interest rate swap in which UNS Electric will pay a fixed rate of 0.97% and receive a three-month LIBOR rate on a $30 million notional amount over a four-year period ending August 10, 2015. The UNS Electric term loan credit agreement, included in Long-Term Debt in the balance sheet, is guaranteed by UES. The term loan credit agreement contains certain restrictive covenants for UNS Electric and UES. The covenants include restrictions on transactions with affiliates, restricted payments, additional indebtedness, liens and mergers. UNS Electric must meet an interest coverage ratio to issue additional debt. However, UNS Electric may, without meeting these tests, refinance indebtedness and incur short-term debt in an amount not to exceed $5 million. The credit agreement also requires UNS Electric to maintain a maximum leverage ratio, and allows UNS Electric to pay dividends so long as it maintains compliance with the credit agreement. UNS GAS SENIOR GUARANTEED NOTES In August 2011, UNS Gas issued $50 million of senior guaranteed notes at 5.39%, due August 2026. UNS Gas used the proceeds to pay in full the $50 million of UNS Gas 6.23% notes that matured in August 2011. UNS Gas notes are guaranteed by UES. The UNS Gas notes are included in Long-Term Debt in the balance sheet. UNS Gas capitalized $0.4 million of costs related to the issuance of the notes and will amortize these costs over the life of the notes. The note purchase agreements contain certain restrictive covenants, including restrictions on transactions with affiliates, mergers, liens on secure indebtedness, restricted payments, and incurrence of indebtedness. UNS Gas must meet an interest coverage ratio and a maximum leverage ratio to issue additional debt and pay dividends. However, UNS Gas may, without meeting these tests, refinance indebtedness and incur short-term debt in an amount not to exceed $5 million. UED SECURED TERM LOAN In July 2011, UED received $63 million from UNS Electric for the sale of BMGS. UED used a portion of those funds to fully repay the $27 million outstanding under its secured term loan. COVENANT COMPLIANCE As of September 30, 2011, UniSource Energy and its subsidiaries were in compliance with the terms of their respective loan and credit agreements and no amounts of net income were subject to dividend restrictions.