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 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>
<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