QUESTAR CORPORATION
              SUPPLEMENTAL EXECUTIVE RETIREMENT PLAN
         (As Amended and Restated effective June 1, 1998)

 1.  PURPOSE

     The Supplemental Executive Retirement Plan is intended to enable 
Questar Corporation and its participating affiliates to attract and 
retain key management personnel by providing them with supplemental 
retirement benefits to compensate them for the limitations imposed by 
federal tax laws on benefits payable from the Questar Corporation 
Retirement Plan.  

 2.  DEFINITIONS

     The following terms, when used herein, shall have the meanings 
set forth below, unless a different meaning is plainly required by the 
context:

     "Board" means the Board of Directors of Questar Corporation or a 
successor company.

     "Code" means the Internal Revenue Code of 1986, as it may be 
amended from time to time.

     "Committee" means the Management Performance Committee of the 
Company's Board.

     "Company" means Questar Corporation or any other organization 
controlling Questar Corporation or any successor organization.

     "Compensation" means a Participant's salary or wages, including 
payments under incentive compensation plans paid by the Employer and 
includable in taxable income during the applicable Plan Year, but 
exclusive of any other forms of additional Compensation such as the 
Company's cost for any public or private employee benefit plan or any 
income recognized by the Participant as a result of exercising stock 
options.  A Participant's Compensation for any Plan Year shall include 
any 401(k) contributions made by the Participant under Questar 
Corporation's Employee Investment Plan or other tax-qualified plan, 
and any Compensation deferred under the Questar Corporation Deferred 
Share Make-Up Plan.  An Officer's Compensation also shall include the 
amount of any reduction in Compensation for a Plan Year agreed upon 
under one or more Compensation reduction agreements entered into 
pursuant to the Questar Corporation Cafeteria Plan.

     "EIRP" means the Company's Executive Incentive Retirement Plan, 
as amended or restated from time to time.

     "Participant" means any officer or other highly compensated 
manager of the Company and/or its affiliates who has a vested right to 
receive benefits under the Company's Retirement Plan, and who has not 
deferred any compensation pursuant to the Company's  

Deferred Compensation Plan and Deferred Share Plan during the period 
covered by his/her Final Average Earnings.

     "Participating Corporation" means any company that is affiliated 
with the Company and whose employees are covered by the Company's 
Retirement Plan or that is affiliated with the Company and receives an 
allocation of any employee benefit costs.

     "Plan" means the plan set forth in and created by this document.

     "Retired Participant" refers to a Participant who has satisfied 
the eligibility requirements set forth in Section 4 of this Plan and 
who is eligible to receive or who is receiving Supplemental Retirement 
Benefits pursuant to the terms of this Plan.

     "Retirement Plan" means the Company's Retirement Plan, as amended 
or restated from time to time, or any successor plan.  If not 
otherwise defined, capitalized words or terms used in the Plan shall 
have the same definitions used in the Retirement Plan.

     "Supplemental Retirement Benefits" means retirement benefits 
payable to Retired Participant under the terms of the Plan calculated 
as set forth in Section 5 or Section 7.

 3.  EFFECTIVE DATE

     The Plan is effective January 1, 1987.  The Company's 
Equalization Benefit Plan was merged into the Plan effective May 19, 
1998.

 4.  PARTICIPATION IN THE PLAN AND ELIGIBILITY FOR BENEFITS

     Participation in the Plan shall be limited to Participants of the 
Company and Participating Corporations.  To become eligible for 
Supplemental Retirement Benefits under the Plan, a Participant must 
have a vested right to receive benefits under the Retirement Plan.  A 
Retired Participant cannot receive benefits under the Plan during any 
period that his monthly benefits from the Retirement Plan are 
suspended.  

 5.  SUPPLEMENTAL RETIREMENT BENEFITS

     A Participant who satisfies the eligibility requirements 
described above shall be eligible to receive Supplemental Retirement 
Benefits under the Plan.  The first payment of Supplemental Retirement 
Benefits will be due on the first day of the month following 
retirement, and payments will continue on the first day of each month 
thereafter so long as the Retired Participant is alive or so long as 
his/her surviving spouse is entitled to receive monthly benefits under 
the Retirement Plan.  (The Retired Participant's surviving spouse must 
have been married to the Participant at date of his/her retirement.)

     The monthly Supplemental Retirement Benefit shall equal the 
monthly benefit that would have been payable to or on behalf of a 
Retired Participant under the Retirement Plan if the limitation on 
annual benefits imposed by Section 415 of the Code and if the 
limitation on annual compensation as defined in Section 401(a)(17) of 
the Code were not applicable, and if the Retired Participant had not 
voluntarily chosen to defer any compensation under the terms of the 
Questar Corporation Deferred Share Make-Up Plan, less the monthly 
benefits payable from the Retirement Plan and the EIRP (if any).  

     Except as provided in Section 7, the monthly Supplemental 
Retirement Benefit payable to or on behalf of the Retired Participant 
as determined herein shall be paid in the same form as such Retired 
Participant's benefits are payable under the Retirement Plan.  Any 
monthly Supplemental Retirement Benefits payable to the Retired 
Participant's surviving spouse shall be reduced by the monthly 
benefits payable to such surviving spouse under the Retirement Plan 
and the EIRP (if any).

6.   LUMP SUM ELECTION.

     A Participant has a one-time election to receive the present 
value of his Supplemental Retirement Benefit in a lump sum.  The 
Participant shall make this election at least one year prior to 
retirement.  The present value shall be calculated using a standard 
mortality table referred to as the "83 Group Annuity Mortality Table" 
and 80 percent of the six-month average rate for 30-year Treasury bond 
(prior to the Participant's retirement).  When making this election, 
the Participant shall also indicate when the lump-sum payment shall be 
made and if it is to be made in more than one installment.  The full 
amount of any lump-sum payment, together with credited interest, must 
be paid within five years of the Participant's retirement.  Any 
deferred payouts of lump-sum payments shall be credited with interest 
calculated at a monthly rate using the appropriate 30-year Treasury 
bond quoted in the Wall Street Journal on the first business day of 
each month.  (The appropriate 30-year Treasury bond shall be the bond 
that has one closest to maturity date (by month) preceding the date on 
which the interest is to be credited.)  Any lump-sum payments that are 
not deferred shall be paid on the first business day of the month 
following the Participant's retirement date or as soon thereafter as 
is administratively practicable.  If the Participant fails to make an 
election at least one year prior to retirement, the Participant shall 
receive monthly benefits.

     Notwithstanding this provision, a Participant who has not been 
advised that he may receive Supplemental Retirement Benefits and has 
not received an opportunity to make a lump-sum election at least one 
year prior to his retirement shall receive any Supplemental Retirement 
Benefits in one lump-sum payment.  The calculation of this benefit and 
the payment of this benefit shall be made in accordance with the 
provisions of this Section.

 7.  FUNDING

     The Supplemental Retirement Benefits payable under the Plan shall 
be paid by the Company and Participating Corporations out of general 
assets.  In its discretion, the Board may establish a trust fund or 
make other arrangements to assure payment of the Supplemental 
Retirement Benefits. 

 8.  ALLOCATION OF COSTS

     The cost of Supplemental Retirement Benefits paid to or on behalf 
of Retired Participants shall be allocated to and be the 
responsibility of the Company and Participating Corporations.

 9.  ADMINISTRATION

     The Committee shall administer the Plan and may appoint an 
officer of the Company to assist the Committee with this 
responsibility.  The Committee shall have the sole responsibility to 
interpret the Plan and to adopt such rules and regulations for 
carrying out the Plan as it may deem necessary.  Decisions of the 
Committee shall be final and binding.

10.  AMENDMENT OR TERMINATION

     The Board may at any time amend, modify, or terminate this Plan; 
provided, however, that any Retired Participants or their surviving 
spouses receiving Supplemental Retirement Benefits under the Plan at 
the date of amendment or termination shall continue receiving such 
benefits as if such amendment or termination had not occurred and 
provided that any amendment, modification, or termination of the Plan 
shall not adversely affect the right of any Participant to receive 
benefits earned prior to such action.

11.  SUCCESSOR TO THE COMPANY

     The Company shall require any successor or assign, whether direct 
or indirect, by purchase, merger, consolidation or otherwise, to all 
or substantially all of the business and/or assets of the Company, to 
assume and agree to pay any Supplemental Retirement Benefits in the 
same manner and to the same extent that the Company would be required 
to perform if no such succession or assignment had taken place.

12.  CHANGE IN CONTROL AND LEGAL FEES

     The Company shall pay all legal fees and expenses that a Retired 
Participant or a Participant may reasonably incur as a result of the 
Company's contesting the validity or enforceability of such 
participant's right to receive benefits under the terms of this Plan 
following a "Change in Control" of the Company. 

     In the event that a Change in Control of the Company occurs and a 
Participant's employment with the Company or its successor(s) 
terminates, the Participant shall receive a lump-sum payment of his 
Supplemental Retirement Benefits within 30 days of the Participant's 
termination.  Such benefits shall be calculated as set forth in 
Section 6.

     A Change in Control of the Company shall be deemed to have 
occurred if (i) any Acquiring Person (as such term is defined in the 
Rights Agreement dated as of February 13, 1996, between the Company 
and ChaseMellon Shareholder Services L.L.C.) is or becomes the 
beneficial owner (as such term is used in Rule 13d-3 under the 
Securities Exchange Act of 1934) of securities of the Company 
representing 25 percent or more of the combined voting power of the 
Company; or (ii) the following individuals cease for any reason to 
constitute a majority of the number of directors then serving:  
individuals who, as of May 19, 1998, constitute the Board and any new 
director (other than a director whose initial assumption of office is 
in connection with an actual or threatened election contest, including 
but not limited to a consent solicitation, relating to the election of 
directors of the Company) whose appointment or election by the Board 
or nomination for election by the Company's stockholders was approved 
or recommended by a vote of at least two-thirds (2/3) of the directors 
then still in office who either were directors on May 19, 1998, or 
whose appointment, election or nomination for election was previously 
so approved or recommended; or (iii) the Company's stockholders 
approve a merger or consolidation of the Company or any direct or 
indirect subsidiary of the Company with any other corporation, other 
than a merger or consolidation that would result in the voting 
securities of the Company outstanding immediately prior to such merger 
or consolidation continuing to represent (either by remaining 
outstanding or by being converted into voting securities of the 
surviving entity or any parent thereof) at least 60 percent of the 
combined voting power of the securities of the Company or such 
surviving entity or any parent thereof outstanding immediately after 
such merger or consolidation, or a merger or consolidation effected to 
implement a recapitalization of the Company (or similar transaction) 
in which no person is or becomes the beneficial owner, directly or 
indirectly, of securities of the Company representing 25 percent or 
more of the combined voting power of the Company's then outstanding 
securities; or (iv) the Company's stockholders approve a plan of 
complete liquidation or dissolution of the Company or there is 
consummated an agreement for the sale or disposition by the Company of 
all or substantially all of the Company's assets, other than a sale or 
disposition by the Company of all or substantially all of the 
Company's assets to an entity, at least 60 percent of the combined 
voting power of the voting securities of which are owned by 
stockholders of the Company in substantially the same proportions as 
their ownership of the Company immediately prior to such sale.  A 
Change in Control, however, shall not be considered to have occurred 
until all conditions precedent to the transaction, including but not 
limited to, all required regulatory approvals have been obtained.