<TABLE> <S> <C>
<PAGE>
<ARTICLE> UT
<LEGEND>
This schedule contains summary financial information extracted from balance
sheet, statement of income and statement of cash flows and is qualified in its
entirety by reference to such financial statements
</LEGEND>
<CIK> 0000084557
<NAME> ROCHESTER GAS AND ELECTRIC CORP.
<MULTIPLIER> 1,000
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-2000
<PERIOD-START> JAN-01-2000
<PERIOD-END> JUN-30-2000
<BOOK-VALUE> PER-BOOK
<TOTAL-NET-UTILITY-PLANT> 1,449,327
<OTHER-PROPERTY-AND-INVEST> 0
<TOTAL-CURRENT-ASSETS> 200,355
<TOTAL-DEFERRED-CHARGES> 733,537
<OTHER-ASSETS> 0
<TOTAL-ASSETS> 2,383,219
<COMMON> 194,429
<CAPITAL-SURPLUS-PAID-IN> 405,469
<RETAINED-EARNINGS> 161,886
<TOTAL-COMMON-STOCKHOLDERS-EQ> 761,784
25,000
47,000
<LONG-TERM-DEBT-NET> 580,104
<SHORT-TERM-NOTES> 0
<LONG-TERM-NOTES-PAYABLE> 214,075
<COMMERCIAL-PAPER-OBLIGATIONS> 0
<LONG-TERM-DEBT-CURRENT-PORT> 3,781
0
<CAPITAL-LEASE-OBLIGATIONS> 0
<LEASES-CURRENT> 0
<OTHER-ITEMS-CAPITAL-AND-LIAB> 751,475
<TOT-CAPITALIZATION-AND-LIAB> 2,383,219
<GROSS-OPERATING-REVENUE> 517,415
<INCOME-TAX-EXPENSE> 43,446
<OTHER-OPERATING-EXPENSES> 386,509
<TOTAL-OPERATING-EXPENSES> 429,142
<OPERATING-INCOME-LOSS> 88,273
<OTHER-INCOME-NET> (143)
<INCOME-BEFORE-INTEREST-EXPEN> 87,317
<TOTAL-INTEREST-EXPENSE> 29,695
<NET-INCOME> 57,622
1,850
<EARNINGS-AVAILABLE-FOR-COMM> 55,772
<COMMON-STOCK-DIVIDENDS> 31,803
<TOTAL-INTEREST-ON-BONDS> 0
<CASH-FLOW-OPERATIONS> 170,403
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>
