<TABLE> <S> <C>
<ARTICLE> OPUR1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-END> JUN-30-2000
<BOOK-VALUE> PER-BOOK
<TOTAL-NET-UTILITY-PLANT> 5,065,047
<OTHER-PROPERTY-AND-INVEST> 166,062
<TOTAL-CURRENT-ASSETS> 307,159
<TOTAL-DEFERRED-CHARGES> 336,349
<OTHER-ASSETS> 229,484
<TOTAL-ASSETS> 6,104,101
<COMMON> 117,040
<CAPITAL-SURPLUS-PAID-IN> 439,839
<RETAINED-EARNINGS> 1,026,417
<TOTAL-COMMON-STOCKHOLDERS-EQ> 1,652,548
73,470
19,791
<LONG-TERM-DEBT-NET> 2,319,710
<SHORT-TERM-NOTES> 332,186
<LONG-TERM-NOTES-PAYABLE> 0
<COMMERCIAL-PAPER-OBLIGATIONS> 0
<LONG-TERM-DEBT-CURRENT-PORT> 65,746
0
<CAPITAL-LEASE-OBLIGATIONS> 0
<LEASES-CURRENT> 0
<OTHER-ITEMS-CAPITAL-AND-LIAB> 1,568,650
<TOT-CAPITALIZATION-AND-LIAB> 6,104,101
<GROSS-OPERATING-REVENUE> 654,168
<INCOME-TAX-EXPENSE> 47,491
<OTHER-OPERATING-EXPENSES> 443,709
<TOTAL-OPERATING-EXPENSES> 491,200
<OPERATING-INCOME-LOSS> 162,968
<OTHER-INCOME-NET> 3,728
<INCOME-BEFORE-INTEREST-EXPEN> 166,696
<TOTAL-INTEREST-EXPENSE> 94,474
<NET-INCOME> 72,222
1,992
<EARNINGS-AVAILABLE-FOR-COMM> 70,230
<COMMON-STOCK-DIVIDENDS> 43,898
<TOTAL-INTEREST-ON-BONDS> 87,323
<CASH-FLOW-OPERATIONS> 95,948
<EPS-BASIC> 0.72
<EPS-DILUTED> 0.72
</TABLE>
