<ARTICLE> UT <MULTIPLIER> 1,000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1997 <PERIOD-END> DEC-31-1997 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 2256200 <OTHER-PROPERTY-AND-INVEST> 0 <TOTAL-CURRENT-ASSETS> 471100 <TOTAL-DEFERRED-CHARGES> 324900 <OTHER-ASSETS> 533000 <TOTAL-ASSETS> 3585200 <COMMON> 1600 <CAPITAL-SURPLUS-PAID-IN> 679300 <RETAINED-EARNINGS> 605100 <TOTAL-COMMON-STOCKHOLDERS-EQ> 1286000 <PREFERRED-MANDATORY> 0 <PREFERRED> 22900 <LONG-TERM-DEBT-NET> 971000 <SHORT-TERM-NOTES> 46000 <LONG-TERM-NOTES-PAYABLE> 0 <COMMERCIAL-PAPER-OBLIGATIONS> 69700 <LONG-TERM-DEBT-CURRENT-PORT> 3400 <PREFERRED-STOCK-CURRENT> 0 <CAPITAL-LEASE-OBLIGATIONS> 0 <LEASES-CURRENT> 0 <OTHER-ITEMS-CAPITAL-AND-LIAB> 1186200 <TOT-CAPITALIZATION-AND-LIAB> 3585200 <GROSS-OPERATING-REVENUE> 1252200 <INCOME-TAX-EXPENSE> 105400 <OTHER-OPERATING-EXPENSES> 981700 <TOTAL-OPERATING-EXPENSES> 1087100 <OPERATING-INCOME-LOSS> 165100 <OTHER-INCOME-NET> 103600 <INCOME-BEFORE-INTEREST-EXPEN> 268700 <TOTAL-INTEREST-EXPENSE> 86400 <NET-INCOME> 182300 <PREFERRED-STOCK-DIVIDENDS> 900 <EARNINGS-AVAILABLE-FOR-COMM> 181400 <COMMON-STOCK-DIVIDENDS> 137200 <TOTAL-INTEREST-ON-BONDS> 85200 <CASH-FLOW-OPERATIONS> 339900 <EPS-PRIMARY> 1.20 <EPS-DILUTED> 1.20