<ARTICLE> UT
<CIK> 0000941138
<NAME> UNISOURCE ENERGY CORPORATION
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                    1,902,900
<OTHER-PROPERTY-AND-INVEST>                    139,366
<TOTAL-CURRENT-ASSETS>                         346,609
<TOTAL-DEFERRED-CHARGES>                       298,037
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                               2,686,912
<COMMON>                                       641,366
<CAPITAL-SURPLUS-PAID-IN>                            0
<RETAINED-EARNINGS>                          (344,145)
<TOTAL-COMMON-STOCKHOLDERS-EQ>                 297,221
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<LONG-TERM-DEBT-NET>                         1,135,820
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                       0
<LONG-TERM-DEBT-CURRENT-PORT>                   48,603
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                    852,529
<LEASES-CURRENT>                                37,045
<OTHER-ITEMS-CAPITAL-AND-LIAB>                 315,694
<TOT-CAPITALIZATION-AND-LIAB>                2,686,912
<GROSS-OPERATING-REVENUE>                      615,171
<INCOME-TAX-EXPENSE>                            23,401
<OTHER-OPERATING-EXPENSES>                     479,474
<TOTAL-OPERATING-EXPENSES>                     502,875
<OPERATING-INCOME-LOSS>                        112,296
<OTHER-INCOME-NET>                              21,507
<INCOME-BEFORE-INTEREST-EXPEN>                 133,803
<TOTAL-INTEREST-EXPENSE>                        83,954
<NET-INCOME>                                    49,849
<PREFERRED-STOCK-DIVIDENDS>                          0
<EARNINGS-AVAILABLE-FOR-COMM>                   49,849
<COMMON-STOCK-DIVIDENDS>                             0
<TOTAL-INTEREST-ON-BONDS>                            0
<CASH-FLOW-OPERATIONS>                          72,321
<EPS-BASIC>                                       1.54
<EPS-DILUTED>                                     1.53