<TABLE> <S> <C>
<PAGE><ARTICLE> UT
<LEGEND> THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE CONSOLIDATED BALANCE SHEET AND RELATED CONSOLIDATED STATEMENTS OF INCOME,
RETAINED EARNINGS AND CASH FLOWS OF NATIONAL GRID USA, AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0001004315
<NAME>NATIONAL GRID USA
<MULTIPLIER> 1,000
<S> <C>
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-END> DEC-31-1999
<PERIOD-TYPE> 12-MOS
<BOOK-VALUE> PER-BOOK
<TOTAL-NET-UTILITY-PLANT> 2,524,591
<OTHER-PROPERTY-AND-INVEST> 242,712
<TOTAL-CURRENT-ASSETS> 689,268
<TOTAL-DEFERRED-CHARGES> 1,455,971 <F1>
<OTHER-ASSETS> 0
<TOTAL-ASSETS> 4,912,542
<COMMON> 64,970
<CAPITAL-SURPLUS-PAID-IN> 736,717
<RETAINED-EARNINGS> 995,091
<TOTAL-COMMON-STOCKHOLDERS-EQ> 1,565,763 <F3>
0
19,480 <F2>
<LONG-TERM-DEBT-NET> 1,006,161
<SHORT-TERM-NOTES> 60,500
<LONG-TERM-NOTES-PAYABLE> 0
<COMMERCIAL-PAPER-OBLIGATIONS> 0
<LONG-TERM-DEBT-CURRENT-PORT> 49,005
0
<CAPITAL-LEASE-OBLIGATIONS> 0
<LEASES-CURRENT> 0
<OTHER-ITEMS-CAPITAL-AND-LIAB> 2,211,633
<TOT-CAPITALIZATION-AND-LIAB> 4,912,542
<GROSS-OPERATING-REVENUE> 2,180,612
<INCOME-TAX-EXPENSE> 105,630
<OTHER-OPERATING-EXPENSES> 1,828,160
<TOTAL-OPERATING-EXPENSES> 1,933,790
<OPERATING-INCOME-LOSS> 246,822
<OTHER-INCOME-NET> 11,256
<INCOME-BEFORE-INTEREST-EXPEN> 258,078
<TOTAL-INTEREST-EXPENSE> 81,117
<NET-INCOME> 135,782
1,075 <F2>
<EARNINGS-AVAILABLE-FOR-COMM> 135,782
<COMMON-STOCK-DIVIDENDS> 139,603
<TOTAL-INTEREST-ON-BONDS> 69,741
<CASH-FLOW-OPERATIONS> 363,028
<EPS-BASIC> $2.29
<EPS-DILUTED> $2.28
<FN>
<F1>Total deferred charges includes other assets.
<F2>Preferred stock reflects preferred stock of subsidiaries. Preferred stock
dividends reflect preferred stock dividends of subsidiaries.
<F3> Total common stockholders equity includes treasury stock at cost and
unrealized gain on securities.
</FN>
