<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM BALANCE
SHEET AS OF SEPTEMBER 30, 1997, AND STATEMENT OF INCOME FOR THREE MONTHS ENDED
SEPTEMBER 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          JUN-30-1998
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                          55,782
<SECURITIES>                                    85,478
<RECEIVABLES>                                   77,293
<ALLOWANCES>                                       346
<INVENTORY>                                      4,625
<CURRENT-ASSETS>                               223,773
<PP&E>                                       1,155,587
<DEPRECIATION>                                 466,288
<TOTAL-ASSETS>                                 931,669
<CURRENT-LIABILITIES>                          123,949
<BONDS>                                        508,971
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           704
<OTHER-SE>                                     290,504
<TOTAL-LIABILITY-AND-EQUITY>                   931,669
<SALES>                                         72,532
<TOTAL-REVENUES>                                78,410
<CGS>                                           64,322
<TOTAL-COSTS>                                   72,897
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                    25
<INTEREST-EXPENSE>                               8,575
<INCOME-PRETAX>                                  5,513
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                              5,513
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     5,513
<EPS-PRIMARY>                                      .08
<EPS-DILUTED>                                      .08