UNISOURCE ENERGY CORPORATION EXHIBIT 11 - COMPUTATION OF EARNINGS PER SHARE Three Months Ended September 30, 1998 1997 ------ ------ - Thousands of Dollars - (except per share data) BASIC EARNINGS PER SHARE: Net Income $33,673 $43,415 Average Shares of Common Stock Outstanding 32,157 32,136 --------- -------- Basic Earnings Per Share $ 1.05 $ 1.35 ========= ======== DILUTED EARNINGS PER SHARE: Net Income $33,673 $43,415 Average Shares of Common Stock Outstanding 32,157 32,136 Effect of Dilutive Securities: Warrants* - 59 Options 59 130 --------- -------- Total Shares 32,216 32,325 --------- -------- Diluted Earnings Per Share $ 1.05 $ 1.34 ========= ======== *The Warrants are for TEP common stock. However, the dilutive effect is the same as it would be if the Warrants were for UniSource Energy's Common Stock. UNISOURCE ENERGY CORPORATION EXHIBIT 11 - COMPUTATION OF EARNINGS PER SHARE Nine Months Ended September 30, 1998 1997 ------ ------ - Thousands of Dollars - (except per share data) BASIC EARNINGS PER SHARE: Net Income $27,696 $84,808 Average Shares of Common Stock Outstanding 32,144 32,138 --------- -------- Basic Earnings Per Share $ 0.86 $ 2.64 ========= ======== DILUTED EARNINGS PER SHARE: Net Income $27,696 $84,808 Average Shares of Common Stock Outstanding 32,144 32,138 Effect of Dilutive Securities: Warrants* 105 20 Options 116 61 --------- -------- Total Shares 32,365 32,219 --------- -------- Diluted Earnings Per Share $ 0.86 $ 2.63 ========= ======== *The Warrants are for TEP common stock. However, the dilutive effect is the same as it would be if the Warrants were for UniSource Energy's Common Stock.