WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

  


<ARTICLE>                                                 UT

<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM CONSTELLATION ENERGY'S SEPTEMBER 30, 1999
INTERIM CONSOLIDATED INCOME STATEMENT, BALANCE
SHEET AND STATEMENT OF CASH FLOWS AND IS QUALIFIED
IN ITS ENTIRETY BY REFERENCE TO SUCH STATEMENTS.
</LEGEND>
<MULTIPLIER>                                                     1,000,000

                                                       
<PERIOD-TYPE>                                             9-MOS
<FISCAL-YEAR-END>                                         DEC-31-1999
<PERIOD-START>                                            JAN-01-1999
<PERIOD-END>                                              SEP-30-1999
<BOOK-VALUE>                                              PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                            5,657
<OTHER-PROPERTY-AND-INVEST>                                          1,833
<TOTAL-CURRENT-ASSETS>                                               1,653
<TOTAL-DEFERRED-CHARGES>                                               629
<OTHER-ASSETS>                                                           0
<TOTAL-ASSETS>                                                       9,772
<COMMON>                                                             1,494
<CAPITAL-SURPLUS-PAID-IN>                                                0
<RETAINED-EARNINGS>                                                  1,589
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                       3,082
<PREFERRED-MANDATORY>                                                    0
<PREFERRED>                                                            190
<LONG-TERM-DEBT-NET>                                                 2,588
<SHORT-TERM-NOTES>                                                       0
<LONG-TERM-NOTES-PAYABLE>                                                0
<COMMERCIAL-PAPER-OBLIGATIONS>                                         143
<LONG-TERM-DEBT-CURRENT-PORT>                                          965
<PREFERRED-STOCK-CURRENT>                                                0
<CAPITAL-LEASE-OBLIGATIONS>                                              0
<LEASES-CURRENT>                                                         0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                       2,804
<TOT-CAPITALIZATION-AND-LIAB>                                        9,772
<GROSS-OPERATING-REVENUE>                                            2,723
<INCOME-TAX-EXPENSE>                                                   167
<OTHER-OPERATING-EXPENSES>                                           2,083
<TOTAL-OPERATING-EXPENSES>                                           2,250
<OPERATING-INCOME-LOSS>                                                473
<OTHER-INCOME-NET>                                                       5
<INCOME-BEFORE-INTEREST-EXPEN>                                         478
<TOTAL-INTEREST-EXPENSE>                                               191
<NET-INCOME>                                                           287
<PREFERRED-STOCK-DIVIDENDS>                                              0
<EARNINGS-AVAILABLE-FOR-COMM>                                          287
<COMMON-STOCK-DIVIDENDS>                                               188
<TOTAL-INTEREST-ON-BONDS>                                              172
<CASH-FLOW-OPERATIONS>                                                 484
<EPS-BASIC>                                                         1.92
<EPS-DILUTED>                                                         1.92