<ARTICLE> UT <MULTIPLIER> 1,000 <PERIOD-TYPE> 3-MOS <FISCAL-YEAR-END> DEC-31-1999 <PERIOD-END> MAR-31-1999 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 2176100 <OTHER-PROPERTY-AND-INVEST> 19100 <TOTAL-CURRENT-ASSETS> 464100 <TOTAL-DEFERRED-CHARGES> 265500 <OTHER-ASSETS> 469100 <TOTAL-ASSETS> 3393900 <COMMON> 400 <CAPITAL-SURPLUS-PAID-IN> 788200 <RETAINED-EARNINGS> 465400 <TOTAL-COMMON-STOCKHOLDERS-EQ> 1254000 <PREFERRED-MANDATORY> 0 <PREFERRED> 22900 <LONG-TERM-DEBT-NET> 660700 <SHORT-TERM-NOTES> 73200 <LONG-TERM-NOTES-PAYABLE> 0 <COMMERCIAL-PAPER-OBLIGATIONS> 123500 <LONG-TERM-DEBT-CURRENT-PORT> 225400 <PREFERRED-STOCK-CURRENT> 0 <CAPITAL-LEASE-OBLIGATIONS> 0 <LEASES-CURRENT> 0 <OTHER-ITEMS-CAPITAL-AND-LIAB> 1034200 <TOT-CAPITALIZATION-AND-LIAB> 3393900 <GROSS-OPERATING-REVENUE> 362900 <INCOME-TAX-EXPENSE> 44500 <OTHER-OPERATING-EXPENSES> 238600 <TOTAL-OPERATING-EXPENSES> 283100 <OPERATING-INCOME-LOSS> 79800 <OTHER-INCOME-NET> 16400 <INCOME-BEFORE-INTEREST-EXPEN> 96200 <TOTAL-INTEREST-EXPENSE> 24400 <NET-INCOME> 71800 <PREFERRED-STOCK-DIVIDENDS> 200 <EARNINGS-AVAILABLE-FOR-COMM> 71600 <COMMON-STOCK-DIVIDENDS> 55800 <TOTAL-INTEREST-ON-BONDS> 27900 <CASH-FLOW-OPERATIONS> 101700 <EPS-PRIMARY> 1.74 <EPS-DILUTED> 1.74