<TABLE> <S> <C>
<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET, CONSOLIDATED STATEMENT OF INCOME, AND
CONSOLIDATED STATEMENT OF CASH FLOWS OF NIAGARA MOHAWK POWER CORPORATION
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000071932
<NAME> Niagara Mohawk Power Corporation
<MULTIPLIER> 1000
<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> 5786115
<OTHER-PROPERTY-AND-INVEST> 367791
<TOTAL-CURRENT-ASSETS> 667234
<TOTAL-DEFERRED-CHARGES> 5448343
<OTHER-ASSETS> 95115
<TOTAL-ASSETS> 12364598
<COMMON> 187365
<CAPITAL-SURPLUS-PAID-IN> 2356695
<RETAINED-EARNINGS> 355194
<TOTAL-COMMON-STOCKHOLDERS-EQ> 2551919
59570
440000
<LONG-TERM-DEBT-NET> 5006891
<SHORT-TERM-NOTES> 0
<LONG-TERM-NOTES-PAYABLE> 0
<COMMERCIAL-PAPER-OBLIGATIONS> 0
<LONG-TERM-DEBT-CURRENT-PORT> 562038
7620
<CAPITAL-LEASE-OBLIGATIONS> 0
<LEASES-CURRENT> 0
<OTHER-ITEMS-CAPITAL-AND-LIAB> 3736560
<TOT-CAPITALIZATION-AND-LIAB> 12364598
<GROSS-OPERATING-REVENUE> 1981097
<INCOME-TAX-EXPENSE> 25287
<OTHER-OPERATING-EXPENSES> 1718465
<TOTAL-OPERATING-EXPENSES> 1718465
<OPERATING-INCOME-LOSS> 262632
<OTHER-INCOME-NET> (7392)
<INCOME-BEFORE-INTEREST-EXPEN> 255240
<TOTAL-INTEREST-EXPENSE> 220897
<NET-INCOME> 8147
15808
<EARNINGS-AVAILABLE-FOR-COMM> (7661)
<COMMON-STOCK-DIVIDENDS> 0
<TOTAL-INTEREST-ON-BONDS> 0
<CASH-FLOW-OPERATIONS> 439622
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>
