<ARTICLE> UT
<LEGEND>
        THE SCHEDULE CONTAINS SUMMARY INFORMATION EXTRACTED FROM CONSOLIDATED
        STATEMENTS OF INCOME, CONSOLIDATED BALANCE SHEETS, AND CONSOLIDATED
        STATEMENTS OF CASH FLOWS, AND QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
        SUCH FINANCIAL STATEMENTS.
</LEGEND>
<CIK> 0000077388
<NAME> PEOPLES GAS LIGHT AND COKE COMPANY
<MULTIPLIER>  1,000

                                     
<PERIOD-TYPE>                           3-MOS
<FISCAL-YEAR-END>                       SEP-30-2000
<PERIOD-START>                          OCT-01-1999
<PERIOD-END>                            DEC-31-1999
<BOOK-VALUE>                            PER-BOOK
<TOTAL-NET-UTILITY-PLANT>               1,280,428
<OTHER-PROPERTY-AND-INVEST>                10,382
<TOTAL-CURRENT-ASSETS>                    364,501
<TOTAL-DEFERRED-CHARGES>                   19,363
<OTHER-ASSETS>                             38,550
<TOTAL-ASSETS>                          1,713,224
<COMMON>                                  165,307
<CAPITAL-SURPLUS-PAID-IN>                       0
<RETAINED-EARNINGS>                       441,462
<TOTAL-COMMON-STOCKHOLDERS-EQ>            606,769
<PREFERRED-MANDATORY>                           0
<PREFERRED>                                     0
<LONG-TERM-DEBT-NET>                      452,000
<SHORT-TERM-NOTES>                              0
<LONG-TERM-NOTES-PAYABLE>                       0
<COMMERCIAL-PAPER-OBLIGATIONS>             91,115
<LONG-TERM-DEBT-CURRENT-PORT>                   0
<PREFERRED-STOCK-CURRENT>                       0
<CAPITAL-LEASE-OBLIGATIONS>                     0
<LEASES-CURRENT>                                0
<OTHER-ITEMS-CAPITAL-AND-LIAB>            563,340
<TOT-CAPITALIZATION-AND-LIAB>           1,713,224
<GROSS-OPERATING-REVENUE>                 286,528
<OTHER-OPERATING-EXPENSES>                238,402
<TOTAL-OPERATING-EXPENSES>                238,402
<OPERATING-INCOME-LOSS>                    48,126
<OTHER-INCOME-NET>                            702
<INCOME-BEFORE-INTEREST-EXPEN>             48,828
<TOTAL-INTEREST-EXPENSE>                    8,531
<INCOME-TAX-EXPENSE>                       15,051
<NET-INCOME>                               25,246
<PREFERRED-STOCK-DIVIDENDS>                     0
<EARNINGS-AVAILABLE-FOR-COMM>              25,246
<COMMON-STOCK-DIVIDENDS>                   36,730
<TOTAL-INTEREST-ON-BONDS>                   7,647
<CASH-FLOW-OPERATIONS>                    (14,082)
<EPS-BASIC>                                   0
<EPS-DILUTED>                                   0