
<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                         111,670
<SECURITIES>                                   238,746
<RECEIVABLES>                                  173,067
<ALLOWANCES>                                         0
<INVENTORY>                                    117,191
<CURRENT-ASSETS>                               654,448
<PP&E>                                       3,000,460
<DEPRECIATION>                               1,391,824
<TOTAL-ASSETS>                               2,736,797
<CURRENT-LIABILITIES>                          203,621
<BONDS>                                        758,604
<PREFERRED-MANDATORY>                           24,894
<PREFERRED>                                     25,465
<COMMON>                                        44,226
<OTHER-SE>                                   1,042,568
<TOTAL-LIABILITY-AND-EQUITY>                 2,736,797
<SALES>                                        348,507
<TOTAL-REVENUES>                               348,507
<CGS>                                          280,514
<TOTAL-COSTS>                                  323,163
<OTHER-EXPENSES>                               (5,029)
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              16,818
<INCOME-PRETAX>                                (1,666)
<INCOME-TAX>                                     (617)
<INCOME-CONTINUING>                              (314)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     (314)
<EPS-PRIMARY>                                   (0.03)
<EPS-DILUTED>                                   (0.03)
        

