<ARTICLE> UT <MULTIPLIER> 1,000 <PERIOD-TYPE> 6-MOS <FISCAL-YEAR-END> DEC-31-1998 <PERIOD-END> JUN-30-1998 <BOOK-VALUE> PER-BOOK <TOTAL-NET-UTILITY-PLANT> 2216900 <OTHER-PROPERTY-AND-INVEST> 0 <TOTAL-CURRENT-ASSETS> 375500 <TOTAL-DEFERRED-CHARGES> 308600 <OTHER-ASSETS> 361700 <TOTAL-ASSETS> 3262700 <COMMON> 400 <CAPITAL-SURPLUS-PAID-IN> 788200 <RETAINED-EARNINGS> 452600 <TOTAL-COMMON-STOCKHOLDERS-EQ> 1241200 <PREFERRED-MANDATORY> 0 <PREFERRED> 22900 <LONG-TERM-DEBT-NET> 885600 <SHORT-TERM-NOTES> 33800 <LONG-TERM-NOTES-PAYABLE> 0 <COMMERCIAL-PAPER-OBLIGATIONS> 91000 <LONG-TERM-DEBT-CURRENT-PORT> 0 <PREFERRED-STOCK-CURRENT> 0 <CAPITAL-LEASE-OBLIGATIONS> 0 <LEASES-CURRENT> 0 <OTHER-ITEMS-CAPITAL-AND-LIAB> 988200 <TOT-CAPITALIZATION-AND-LIAB> 3262700 <GROSS-OPERATING-REVENUE> 646100 <INCOME-TAX-EXPENSE> 65400 <OTHER-OPERATING-EXPENSES> 437500 <TOTAL-OPERATING-EXPENSES> 502900 <OPERATING-INCOME-LOSS> 143200 <OTHER-INCOME-NET> 6200 <INCOME-BEFORE-INTEREST-EXPEN> 149400 <TOTAL-INTEREST-EXPENSE> 43700 <NET-INCOME> 105700 <PREFERRED-STOCK-DIVIDENDS> 400 <EARNINGS-AVAILABLE-FOR-COMM> 105300 <COMMON-STOCK-DIVIDENDS> 172000 <TOTAL-INTEREST-ON-BONDS> 42400 <CASH-FLOW-OPERATIONS> 149100 <EPS-PRIMARY> 2.56 <EPS-DILUTED> 2.56