<ARTICLE> 5
<LEGEND>
The following schedule contains summarized financial information extracted
from the Questar Corporation Consolidated Income Statement and Balance Sheet
for the period ended September 30, 1999, and is qualified in its entirety
by reference to such unaudited financial statements.
</LEGEND>
<MULTIPLIER> 1,000

                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-END>                               SEP-30-1999
<CASH>                                               0
<SECURITIES>                                         0
<RECEIVABLES>                                  117,671
<ALLOWANCES>                                         0
<INVENTORY>                                     36,374
<CURRENT-ASSETS>                               178,682
<PP&E>                                       3,227,751
<DEPRECIATION>                               1,456,652
<TOTAL-ASSETS>                               2,168,273
<CURRENT-LIABILITIES>                          275,437
<BONDS>                                        692,070
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       302,674
<OTHER-SE>                                     641,090
<TOTAL-LIABILITY-AND-EQUITY>                 2,168,273
<SALES>                                              0
<TOTAL-REVENUES>                               638,742
<CGS>                                                0
<TOTAL-COSTS>                                  386,934
<OTHER-EXPENSES>                               126,501
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                              38,748
<INCOME-PRETAX>                                121,675
<INCOME-TAX>                                    40,139
<INCOME-CONTINUING>                             81,536
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    81,536
<EPS-BASIC>                                        .99
<EPS-DILUTED>                                      .98