<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> 9-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<BOOK-VALUE> PER-BOOK
<TOTAL-NET-UTILITY-PLANT> 1,455,636
<OTHER-PROPERTY-AND-INVEST> 0
<TOTAL-CURRENT-ASSETS> 215,226
<TOTAL-DEFERRED-CHARGES> 731,806
<OTHER-ASSETS> 0
<TOTAL-ASSETS> 2,402,668
<COMMON> 194,429
<CAPITAL-SURPLUS-PAID-IN> 393,563
<RETAINED-EARNINGS> 160,163
<TOTAL-COMMON-STOCKHOLDERS-EQ> 748,155
25,000
47,000
<LONG-TERM-DEBT-NET> 580,117
<SHORT-TERM-NOTES> 31,500
<LONG-TERM-NOTES-PAYABLE> 212,904
<COMMERCIAL-PAPER-OBLIGATIONS> 0
<LONG-TERM-DEBT-CURRENT-PORT> 3,998
0
<CAPITAL-LEASE-OBLIGATIONS> 0
<LEASES-CURRENT> 0
<OTHER-ITEMS-CAPITAL-AND-LIAB> 753,994
<TOT-CAPITALIZATION-AND-LIAB> 2,402,668
<GROSS-OPERATING-REVENUE> 741,102
<INCOME-TAX-EXPENSE> 46,318
<OTHER-OPERATING-EXPENSES> 579,368
<TOTAL-OPERATING-EXPENSES> 625,686
<OPERATING-INCOME-LOSS> 115,416
<OTHER-INCOME-NET> 1,475
<INCOME-BEFORE-INTEREST-EXPEN> 116,891
<TOTAL-INTEREST-EXPENSE> 44,473
<NET-INCOME> 72,418
2,775
<EARNINGS-AVAILABLE-FOR-COMM> 69,643
<COMMON-STOCK-DIVIDENDS> 47,960
<TOTAL-INTEREST-ON-BONDS> 0
<CASH-FLOW-OPERATIONS> 194,219
<EPS-BASIC> 0
<EPS-DILUTED> 0
</TABLE>
