<ARTICLE> UT
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM BALTIMORE
GAS AND ELECTRIC COMPANY'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> 0000009466
<NAME> BALTIMORE GAS & ELECTRIC CO.
<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>                        414
<TOTAL-CURRENT-ASSETS>                             655
<TOTAL-DEFERRED-CHARGES>                           681
<OTHER-ASSETS>                                       0
<TOTAL-ASSETS>                                   7,273
<COMMON>                                         1,494
<CAPITAL-SURPLUS-PAID-IN>                            0
<RETAINED-EARNINGS>                                861
<TOTAL-COMMON-STOCKHOLDERS-EQ>                   2,355
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                        190
<LONG-TERM-DEBT-NET>                             2,206
<SHORT-TERM-NOTES>                                   0
<LONG-TERM-NOTES-PAYABLE>                            0
<COMMERCIAL-PAPER-OBLIGATIONS>                     129
<LONG-TERM-DEBT-CURRENT-PORT>                      524
<PREFERRED-STOCK-CURRENT>                            0
<CAPITAL-LEASE-OBLIGATIONS>                          0
<LEASES-CURRENT>                                     0
<OTHER-ITEMS-CAPITAL-AND-LIAB>                   1,869
<TOT-CAPITALIZATION-AND-LIAB>                    7,273
<GROSS-OPERATING-REVENUE>                        3,028
<INCOME-TAX-EXPENSE>                               178
<OTHER-OPERATING-EXPENSES>                       2,324
<TOTAL-OPERATING-EXPENSES>                       2,502
<OPERATING-INCOME-LOSS>                            526
<OTHER-INCOME-NET>                                   8
<INCOME-BEFORE-INTEREST-EXPEN>                     534
<TOTAL-INTEREST-EXPENSE>                           206
<NET-INCOME>                                       262
<PREFERRED-STOCK-DIVIDENDS>                         13
<EARNINGS-AVAILABLE-FOR-COMM>                      249
<COMMON-STOCK-DIVIDENDS>                           251
<TOTAL-INTEREST-ON-BONDS>                          174
<CASH-FLOW-OPERATIONS>                             783
<EPS-BASIC>                                        0
<EPS-DILUTED>                                        0