<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
CONSTELLATION ENERGY'S DECEMBER 31, 1999 CONSOLIDATED INCOME STATEMENT, BALANCE
SHEET AND STATEMENT OF CASH FLOWS AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH STATEMENTS.
</LEGEND>
<CIK> 0001004440
<NAME> CONSTELLATION ENERGY GROUP INC.
<MULTIPLIER> 1,000,000

                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               DEC-31-1999
<BOOK-VALUE>                                  PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                        5,523
<OTHER-PROPERTY-AND-INVEST>                      1,981
<TOTAL-CURRENT-ASSETS>                           1,491
<TOTAL-DEFERRED-CHARGES>                           689
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                                   9,684
<COMMON>                                         1,494
<CAPITAL-SURPLUS-PAID-IN>                            0
<RETAINED-EARNINGS>                              1,499
<TOTAL-COMMON-STOCKHOLDERS-EQ>                   2,993
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                        190
<LONG-TERM-DEBT-NET>                             2,575
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                     372
<LONG-TERM-DEBT-CURRENT-PORT>                      808
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                   2,746
<TOT-CAPITALIZATION-AND-LIAB>                    9,684
<GROSS-OPERATING-REVENUE>                        3,786
<INCOME-TAX-EXPENSE>                               186
<OTHER-OPERATING-EXPENSES>                       3,026
<TOTAL-OPERATING-EXPENSES>                       3,212
<OPERATING-INCOME-LOSS>                            574
<OTHER-INCOME-NET>                                   7
<INCOME-BEFORE-INTEREST-EXPEN>                     581
<TOTAL-INTEREST-EXPENSE>                           255
<NET-INCOME>                                       260
<PREFERRED-STOCK-DIVIDENDS>                          0
<EARNINGS-AVAILABLE-FOR-COMM>                      260
<COMMON-STOCK-DIVIDENDS>                           251
<TOTAL-INTEREST-ON-BONDS>                          230
<CASH-FLOW-OPERATIONS>                             679
<EPS-BASIC>                                       1.74
<EPS-DILUTED>                                     1.74