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  JUNE 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>                                             6-MOS
<FISCAL-YEAR-END>                                         DEC-31-1999
<PERIOD-START>                                            JAN-01-1999
<PERIOD-END>                                              JUN-30-1999
<BOOK-VALUE>                                              PER-BOOK
<TOTAL-NET-UTILITY-PLANT>                                            5,645
<OTHER-PROPERTY-AND-INVEST>                                          1,719
<TOTAL-CURRENT-ASSETS>                                               1,292
<TOTAL-DEFERRED-CHARGES>                                               578
<OTHER-ASSETS>                                                           0
<TOTAL-ASSETS>                                                       9,234
<COMMON>                                                             1,494
<CAPITAL-SURPLUS-PAID-IN>                                                0
<RETAINED-EARNINGS>                                                  1,516
<TOTAL-COMMON-STOCKHOLDERS-EQ>                                       3,004
<PREFERRED-MANDATORY>                                                    0
<PREFERRED>                                                            190
<LONG-TERM-DEBT-NET>                                                 2,964
<SHORT-TERM-NOTES>                                                       0
<LONG-TERM-NOTES-PAYABLE>                                                0
<COMMERCIAL-PAPER-OBLIGATIONS>                                         109
<LONG-TERM-DEBT-CURRENT-PORT>                                          467
<PREFERRED-STOCK-CURRENT>                                                7
<CAPITAL-LEASE-OBLIGATIONS>                                              0
<LEASES-CURRENT>                                                         0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                                       2,493
<TOT-CAPITALIZATION-AND-LIAB>                                        9,234
<GROSS-OPERATING-REVENUE>                                            1,752
<INCOME-TAX-EXPENSE>                                                    89
<OTHER-OPERATING-EXPENSES>                                           1,390
<TOTAL-OPERATING-EXPENSES>                                           1,479
<OPERATING-INCOME-LOSS>                                                273
<OTHER-INCOME-NET>                                                       4
<INCOME-BEFORE-INTEREST-EXPEN>                                         277
<TOTAL-INTEREST-EXPENSE>                                               126
<NET-INCOME>                                                           151
<PREFERRED-STOCK-DIVIDENDS>                                              0
<EARNINGS-AVAILABLE-FOR-COMM>                                          151
<COMMON-STOCK-DIVIDENDS>                                               126
<TOTAL-INTEREST-ON-BONDS>                                              113
<CASH-FLOW-OPERATIONS>                                                 370
<EPS-BASIC>                                                         1.01
<EPS-DILUTED>                                                         1.01