UNISOURCE ENERGY CORPORATION EXHIBIT 11 - COMPUTATION OF EARNINGS PER SHARE Years Ended December 31, 1999 1998 1997 ------ ------ ------ - Thousands of Dollars - (except per share data) Basic Earnings Per Share: Numerator: Income Before Extraordinary Item $56,510 $28,032 $83,572 Denominator: Average Shares of Common Stock - Outstanding 32,321 32,177 32,138 ------ ------ ------- Basic Earnings Per Share Before Extraordinary Item $ 1.75 $ 0.87 $ 2.60 ====== ====== ======= Diluted Earnings Per Share: Numerator: Income Before Extraordinary Item $56,510 $28,032 $83,572 Denominator: Average Shares of Common Stock - Outstanding 32,321 32,177 32,138 Effect of Dilutive Securities: Warrants - 79 53 Options and Stock Issuable under Employee Benefit Plans 257 90 87 ------ ------ ------- Total Shares 32,578 32,346 32,278 ------ ------ ------- Diluted Earnings Per Share Before Extraordinary Item $ 1.74 $ 0.87 $ 2.59 ====== ====== ======= Options to purchase 1,115,000 shares of common stock at $12.28 to $18.13 per share were outstanding at the end of the year 1999 but were not included in the computation of diluted EPS because the options' exercise price was greater than the average market price of the common shares. 4.6 million of the 6.1 million warrants outstanding are exercisable into TEP common stock. See Note 12. However, the dilutive effect is the same as it would be if the warrants were exercisable into UniSource Energy Common Stock.