<TABLE> <S> <C>
<PAGE>
<ARTICLE> UT
<MULTIPLIER> 1,000,000
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<BOOK-VALUE> PER-BOOK
<TOTAL-NET-UTILITY-PLANT> 15,225
<OTHER-PROPERTY-AND-INVEST> 643
<TOTAL-CURRENT-ASSETS> 772
<TOTAL-DEFERRED-CHARGES> 86
<OTHER-ASSETS> 1,933
<TOTAL-ASSETS> 18,659
<COMMON> 2,636
<CAPITAL-SURPLUS-PAID-IN> 0
<RETAINED-EARNINGS> 4,182
<TOTAL-COMMON-STOCKHOLDERS-EQ> 6,818
850
115
<LONG-TERM-DEBT-NET> 4,508
<SHORT-TERM-NOTES> 243
<LONG-TERM-NOTES-PAYABLE> 0
<COMMERCIAL-PAPER-OBLIGATIONS> 0
<LONG-TERM-DEBT-CURRENT-PORT> 593
0
<CAPITAL-LEASE-OBLIGATIONS> 0
<LEASES-CURRENT> 0
<OTHER-ITEMS-CAPITAL-AND-LIAB> 5,532
<TOT-CAPITALIZATION-AND-LIAB> 18,659
<GROSS-OPERATING-REVENUE> 5,479
<INCOME-TAX-EXPENSE> 346
<OTHER-OPERATING-EXPENSES> 4,064
<TOTAL-OPERATING-EXPENSES> 4,410
<OPERATING-INCOME-LOSS> 1,069
<OTHER-INCOME-NET> (6)
<INCOME-BEFORE-INTEREST-EXPEN> 1,063
<TOTAL-INTEREST-EXPENSE> 332
<NET-INCOME> 731
7
<EARNINGS-AVAILABLE-FOR-COMM> 724
<COMMON-STOCK-DIVIDENDS> 0
<TOTAL-INTEREST-ON-BONDS> 289
<CASH-FLOW-OPERATIONS> 1,305
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>