<ARTICLE> UT <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> MAR-31-1998 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 2222100 <OTHER-PROPERTY-AND-INVEST> 0 <TOTAL-CURRENT-ASSETS> 416300 <TOTAL-DEFERRED-CHARGES> 317300 <OTHER-ASSETS> 329200 <TOTAL-ASSETS> 3284900 <COMMON> 400 <CAPITAL-SURPLUS-PAID-IN> 739100 <RETAINED-EARNINGS> 475200 <TOTAL-COMMON-STOCKHOLDERS-EQ> 1214700 <PREFERRED-MANDATORY> 0 <PREFERRED> 22900 <LONG-TERM-DEBT-NET> 886000 <SHORT-TERM-NOTES> 60300 <LONG-TERM-NOTES-PAYABLE> 0 <COMMERCIAL-PAPER-OBLIGATIONS> 96300 <LONG-TERM-DEBT-CURRENT-PORT> 400 <PREFERRED-STOCK-CURRENT> 0 <CAPITAL-LEASE-OBLIGATIONS> 0 <LEASES-CURRENT> 0 <OTHER-ITEMS-CAPITAL-AND-LIAB> 1004300 <TOT-CAPITALIZATION-AND-LIAB> 3284900 <GROSS-OPERATING-REVENUE> 352900 <INCOME-TAX-EXPENSE> 41200 <OTHER-OPERATING-EXPENSES> 225600 <TOTAL-OPERATING-EXPENSES> 266800 <OPERATING-INCOME-LOSS> 86100 <OTHER-INCOME-NET> 4600 <INCOME-BEFORE-INTEREST-EXPEN> 90700 <TOTAL-INTEREST-EXPENSE> 21200 <NET-INCOME> 69500 <PREFERRED-STOCK-DIVIDENDS> 200 <EARNINGS-AVAILABLE-FOR-COMM> 69300 <COMMON-STOCK-DIVIDENDS> 116800 <TOTAL-INTEREST-ON-BONDS> 26700 <CASH-FLOW-OPERATIONS> 73100 <EPS-PRIMARY> 1.68 <EPS-DILUTED> 1.68