<ARTICLE> UT <MULTIPLIER> 1,000 <PERIOD-TYPE> YEAR <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> DEC-31-1999 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 2,153,200 <OTHER-PROPERTY-AND-INVEST> 17,600 <TOTAL-CURRENT-ASSETS> 556,300 <TOTAL-DEFERRED-CHARGES> 221,800 <OTHER-ASSETS> 204,200 <TOTAL-ASSETS> 3,153,100 <COMMON> 400 <CAPITAL-SURPLUS-PAID-IN> 769,100 <RETAINED-EARNINGS> 526,000 <TOTAL-COMMON-STOCKHOLDERS-EQ> 1,295,500 <PREFERRED-MANDATORY> 0 <PREFERRED> 22,900 <LONG-TERM-DEBT-NET> 661,200 <SHORT-TERM-NOTES> 1,300 <LONG-TERM-NOTES-PAYABLE> 0 <COMMERCIAL-PAPER-OBLIGATIONS> 123,100 <LONG-TERM-DEBT-CURRENT-PORT> 400 <PREFERRED-STOCK-CURRENT> 0 <CAPITAL-LEASE-OBLIGATIONS> 0 <LEASES-CURRENT> 0 <OTHER-ITEMS-CAPITAL-AND-LIAB> 1,048,700 <TOT-CAPITALIZATION-AND-LIAB> 3,153,100 <GROSS-OPERATING-REVENUE> 1,273,300 <INCOME-TAX-EXPENSE> 121,100 <OTHER-OPERATING-EXPENSES> 894,500 <TOTAL-OPERATING-EXPENSES> 1,015,600 <OPERATING-INCOME-LOSS> 257,700 <OTHER-INCOME-NET> 14,500 <INCOME-BEFORE-INTEREST-EXPEN> 272,200 <TOTAL-INTEREST-EXPENSE> 79,800 <NET-INCOME> 192,400 <PREFERRED-STOCK-DIVIDENDS> 900 <EARNINGS-AVAILABLE-FOR-COMM> 191,500 <COMMON-STOCK-DIVIDENDS> 130,300 <TOTAL-INTEREST-ON-BONDS> 79,200 <CASH-FLOW-OPERATIONS> 401,300 <EPS-BASIC> 4.65 <EPS-DILUTED> 4.65