Exhibit 12(a) TUCSON ELECTRIC POWER COMPANY COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES 12 Months Ended ---------------------------------------------------------- Dec. 31, Dec. 31, Dec. 31, Dec. 31, Dec. 31, 2004 2003 2002 2001 2000 - ------------------------------------------------------------------------------------------------------ - Thousands of Dollars - FIXED CHARGES: Interest on Long-Term Debt $ 71,743 $ 76,585 $ 65,620 $ 68,678 $ 75,076 Other Interest (1) 1,414 1,820 273 441 211 Interest on Capital Lease Obligations 85,869 84,053 87,783 90,506 92,815 - ------------------------------------------------------------------------------------------------------ TOTAL FIXED CHARGES 159,026 162,458 153,676 159,625 168,102 NET INCOME 46,127 128,913 55,390 77,778 52,762 LESS: Extraordinary Income & Accounting Change - Net of Tax - 67,471 - 470 - - ------------------------------------------------------------------------------------------------------ NET INCOME FROM CONTINUING OPERATIONS 46,127 61,442 55,390 77,308 52,762 ADD (DEDUCT): (Income) Losses from Equity Investees (2) (131) (76) 17 700 1,543 Income Taxes 34,815 21,090 36,434 57,545 27,610 Total Fixed Charges 159,026 162,458 153,676 159,625 168,102 - ------------------------------------------------------------------------------------------------------ TOTAL EARNINGS BEFORE TAXES AND FIXED CHARGES $ 239,837 $ 244,914 $ 245,517 $ 295,178 $ 250,017 ====================================================================================================== RATIO OF EARNINGS TO FIXED CHARGES 1.508 1.508 1.598 1.849 1.487 <FN> (1) Excludes recognition of Allowance for Borrowed Funds Used During Construction. (2) Inncom International, Inc. and TruePricing, Inc. (income) losses. </FN>